Signs of overtraining: symptoms, recovery time and how to avoid it

Short answer

The main signs of overtraining are a drop in performance that does not bounce back after a few easy days, fatigue that sleep does not fix, ordinary sessions feeling unusually hard, disturbed sleep and a flatter mood. The European and American sports-medicine consensus describes overtraining syndrome as a sport-specific drop in performance with mood disturbance that persists despite several weeks or months of recovery (1).

Far more often, people who feel wrecked from training are overreaching, which resolves in days to weeks of lighter work. Full overtraining syndrome appears to be rare (2), and it can only be diagnosed after a clinician rules out other causes such as anemia, infection, thyroid disease or eating too little for the training load (1).

If you have pushed through weeks of feeling worse instead of better, you are not imagining it, and needing rest is not weakness or a lack of discipline. It is a mismatch between load and recovery, and the consensus treatment is rest (1).

Note: this article explains what research says and is not medical advice. Chest pain, fainting, or a racing or irregular heartbeat with dizziness during exercise means stop and call 911. Missed periods for three months or more, a suspected stress fracture or rapid weight loss means seeing a clinician. If you have thoughts of harming yourself, call or text 988.

What is overtraining?

Overtraining is a long-term drop in performance from more training and life stress than your body can recover from, often with physical and mood symptoms. Restoring performance takes several weeks or months, according to the ECSS/ACSM joint consensus statement (1).

In everyday speech the word covers anything from sore legs to months of exhaustion, so sports scientists split it into stages along a continuum (1, 3):

• Acute fatigue after a hard session, gone in a day or two.

• Functional overreaching: a planned or accidental block of heavy training that lowers performance for days to weeks, followed by a rebound once you rest.

• Non-functional overreaching: the same pattern pushed further, with performance stuck for weeks or months, plus fatigue and mood changes. Full recovery is expected with enough rest.

• Overtraining syndrome: the far end, with performance down for months and more severe symptoms.

Stress outside training counts: the consensus definitions include non-training stress, such as sleep loss, travel across time zones, occupational pressure, a change of residence and family difficulties (1).

What is overtraining syndrome?

Overtraining syndrome (OTS) is the clinical diagnosis at the end of that continuum: unexplained underperformance with mood disturbance that lasts despite weeks to months of rest, once other medical causes have been excluded. "As there is no diagnostic tool to identify an athlete as suffering from OTS, diagnosis can only be made by excluding all other possible influences," the consensus authors write (1).

No blood test, heart-rate number or questionnaire confirms it. A clinical review notes that most research has studied overreaching rather than the full syndrome, and describes OTS as appearing "extremely rare" (2). The same review, citing an earlier survey we report second-hand, puts lifetime rates of non-functional overreaching at about 60% in elite runners and 33% in non-elite female runners.

Signs of overtraining: the symptoms to watch for

The clearest sign of overtraining is performance that keeps falling even though you are training as hard or harder, combined with persistent fatigue. Most other symptoms are non-specific: each, on its own, has many possible causes.

The consensus checklist for clinicians starts with four questions: unexplained underperformance, persistent fatigue, an increased sense of effort in training, and sleep disorders (1). A clinical review lists the wider picture (2).

Overtraining symptoms in body, mood and performance

• Performance — Times or loads going backward; able to start a session but not finish it; harder effort for the same pace

• Energy — Fatigue that rest days don't clear; waking unrefreshed

• Muscles — Heavy, sore, stiff muscles that linger

• Sleep — Insomnia or restless, broken sleep

• Mood — Low mood, irritability, anxiety, restlessness, loss of motivation, poor concentration

• Appetite and weight — Loss of appetite, weight loss

• Heart and circulation — A slower or faster heart rate than usual; high blood pressure

• Illness — More frequent colds and upper respiratory infections

One of the earliest signs is the effort, not the result. The same review advises educating athletes that a higher rating of perceived exertion for a given workload is one of the first signs of overreaching (2).

What does overtraining feel like?

It tends to feel flat and heavy: easy pace feels hard and motivation fades. One clue that points toward overreaching rather than another illness is being able to start a session but not complete it (2).

It is also emotional. In ten years of monitoring about 400 competitive swimmers, mood disturbance rose in a dose-response way as training load increased and returned to baseline when the load was reduced (4). The consensus statement notes that the depressive component is more pronounced in overtraining syndrome than in overreaching (1).

A red flag belongs right here. Low mood that turns into hopelessness or thoughts of harming yourself is not a training problem: call or text 988 to reach the 988 Suicide & Crisis Lifeline, at any time (15).

Overreaching vs overtraining: where the line is

The difference between overreaching and overtraining is mainly how long recovery takes, not how bad the symptoms feel at the time. Overreaching resolves in days to weeks; overtraining syndrome takes months, and the two can only be told apart in hindsight (1, 2).

Telling non-functional overreaching from overtraining syndrome is very difficult, the consensus says, and no scientific evidence confirms or refutes the common assumption that OTS symptoms are more severe (1).

Functional overreaching: the useful kind of tired

Functional overreaching is the short dip coaches often plan on purpose, for example in a training camp. The consensus describes it as a short-term performance drop without severe psychological or lasting symptoms, which eventually leads to better performance after recovery (1).

It is not risk-free. A 2020 review links it to negative cardiovascular, hormonal and metabolic changes, and several studies found smaller training gains in overreached athletes than in peers doing the same training; others found a strong rebound (3). The review questions whether deliberately overreaching is needed at all; without a coach, a planned dip is easy to overshoot.

Non-functional overreaching: when the dip doesn't lift

Non-functional overreaching is far more common than the full syndrome (2). In the consensus description, performance stagnates or falls for several weeks or months, but these athletes eventually recover fully after sufficient rest (1).

Am I overtraining? A self-check

You may be overreaching if several of these have lasted a week or two despite easier days: performance falling, normal sessions feeling harder, waking unrefreshed, worse sleep, lower mood or motivation, more colds. The consensus checklist uses the same building blocks (1).

Then look at load. The consensus lists the training errors a clinician should ask about (1):

• training volume increased by more than 5% (hours or distance per week);

• a significant jump in intensity;

• monotonous training with little variation;

• a high number of competitions or races;

• heat, cold or altitude exposure;

• recent or repeated travel across time zones;

• social and work stress: family, relationships, finances, job.

How you feel tracks training load better than many objective markers. A systematic review of 56 studies found that subjective measures such as mood and perceived stress "reflected acute and chronic training loads with superior sensitivity and consistency than objective measures", which included blood markers and heart rate (5). The consensus authors stress that recording training load every day in a diary is essential (1).

What about resting heart rate and HRV? Both can shift during hard training, but the consensus notes that resting heart rate changes are not consistently found in overtraining syndrome and that HRV results vary between studies (1). Meta-analyses found changes small enough to fall within day-to-day variation (7), resting HRV "largely unaffected by overreaching", and faster heart rate recovery after exercise with both good adaptation and overreaching (8). Read them next to symptoms and performance. We cover this angle in why HRV drops and resting heart rate rises when you train hard; see also low resting heart rate: athlete's heart or a concern and how fast your heart rate should drop after exercise.

Overtraining and sleep

Disturbed sleep is both a symptom of overtraining and a trigger. The consensus lists sleep disorders among the core questions for diagnosis and sleep loss among the stressors that add to training load (1).

In a 2014 study of 27 trained male triathletes, 18 did three weeks of overload training and nine became functionally overreached. Only that group showed shorter and less efficient sleep on wrist actigraphy (sleep duration down 7.9% on average), and it reversed during the taper that followed (6). Upper respiratory infections hit 67% of the overreached group, 22% of those who handled the overload and 11% of controls.

A run of bad nights during a heavy block is a cue to look at the load. The consensus also advises coaches to keep reinforcing good nutrition, hydration and sleep (1). To compare what different wearables record overnight, see which trackers give the best overnight recovery metrics.

Female overtraining symptoms

Women share the same signs of overtraining as men, plus one that deserves its own section: changes in the menstrual cycle. Missed or irregular periods during heavy training point toward low energy availability, and they need a clinician's attention.

The overlap with REDs. The International Olympic Committee's 2023 consensus on Relative Energy Deficiency in Sport (REDs) describes a syndrome caused by low energy availability: too little energy eaten relative to the energy spent in exercise (10). It affects reproductive function, bone health, immunity, metabolism and performance, with mood disturbances and reduced sleep quality among its indicators. The IOC panel states that low energy availability should be excluded before overtraining syndrome is diagnosed.

A 2021 review found that in 18 of 21 training-overload or overtraining studies that measured diet and energy use, there were signs of lower energy or carbohydrate availability during the overload period (9). The authors propose that many negative outcomes blamed on training overload "may be primarily due to misdiagnosed under-fueling." That is a hypothesis, but it adds a first question: am I eating enough for what I do?

What to watch for. Track your cycle alongside sleep, fatigue and soreness; one swimming study's daily logs did exactly that (1).

Red flags, here and not later. The Endocrine Society suggests evaluation for anyone whose cycle interval persistently exceeds 45 days or who has had no periods for 3 months or more (11). Missed periods are not a normal side effect of fitness. Bone pain that worsens with impact (a possible stress fracture), rapid weight loss, or anxiety around food and weight also mean a clinician. REDs affects men too, with effects on hormones, bone health and performance (10), which are easier to miss than a skipped period.

Can overtraining cause weight gain?

Weight gain is not on the symptom lists in the sources we used: the clinical review lists loss of appetite and weight loss as features of overtraining syndrome (2). That is not proof that overtraining can never come with weight gain, only that the research we reviewed does not describe it.

Weight going up while you feel exhausted and train worse deserves a check for other causes: the consensus asks clinicians to rule out endocrine diseases, including thyroid and adrenal conditions and diabetes (1).

The opposite direction has stronger evidence: weight loss during heavy training is linked to under-fueling and REDs (10). Rapid weight loss is a reason to see a clinician, not a goal to chase through more training.

What else could it be?

Because overtraining syndrome is a diagnosis of exclusion, a doctor's main job is to look for something else. The consensus checklist names anemia, Epstein-Barr virus and other infections, muscle damage, Lyme disease, endocrine diseases (diabetes, thyroid, adrenal), major disorders of eating behavior, injuries, cardiac symptoms, adult-onset asthma and allergies (1). A review adds iron deficiency with or without anemia and celiac disease as examples (2).

Depression is the other overlap. Low mood, poor sleep, loss of interest and fatigue are shared symptoms, and overtraining syndrome has a more pronounced depressive component than overreaching (1). If low mood is the main thing, or persists when training drops, raise it with a clinician as a mood problem first.

Post-exertional malaise is not overtraining. Post-exertional malaise (PEM) is a core feature of ME/CFS: a worsening of symptoms after physical or mental activity "that wouldn't have been a problem before they became ill", with fatigue lasting six months or longer that sleep does not relieve (14). It is a chronic-illness phenomenon, not a training-load problem; our guide to post-exertional malaise explains it. If crashes after modest activity sound familiar, tell a doctor.

How to recover from overtraining

Recovery from overtraining means rest first, then a gradual, symptom-guided return. The consensus advice is short: treat overtraining syndrome with rest. It adds that reduced training may be enough in some cases of overreaching (1).

The consensus and a clinical review describe these steps:

1. Cut the load. Functional overreaching needs only a better balance of load and recovery; for longer slumps, rest or relative rest (light activity only) is the treatment (2). The review suggests relative rest with clear expectations if stress, depression or anxiety rise during complete rest.

2. Rule out other causes with a clinician if symptoms last more than a couple of weeks (1).

3. Fix the inputs: sleep, enough food and carbohydrate for your training, and hydration (1, 2).

4. Deal with the rest of your stress load. Work, family and relationship stress are recognized contributors (1); a sports psychologist or mental-health professional can be part of the team (2).

5. Come back by symptoms, not by the calendar. The consensus says resuming training should be individualized and guided by signs and symptoms, because there is no definitive indicator of recovery (1). The review describes building volume before intensity, starting with short daily sessions (2); your clinician or coach decides what that looks like for you.

Red flags while you recover. Chest pain or discomfort, shortness of breath out of proportion to effort, a rapid or irregular heartbeat, or feeling lightheaded during exercise means stopping and calling 911 (12). Fainting during exertion is one of the features the US syncope guideline links with a cardiac cause (13); it needs emergency care, not a rest week.

If an injury was part of the picture, see how to return to exercise after injury.

How long does it take to recover from overtraining?

It depends on where you are on the continuum. Functional overreaching resolves in days to weeks, non-functional overreaching in weeks to months, and overtraining syndrome in months or longer (1). The consensus notes that recovery from overreaching is possible within about two weeks, while athletes with full overtraining syndrome may take months, possibly years, to recover completely.

Nobody can tell in advance which group you are in. If 14 to 21 days of rest restore performance, it was overreaching by the definition some clinicians use (2). Fatigue that persists despite weeks of genuine rest is a reason to see a clinician, because the cause may not be training at all.

How to avoid overtraining

Avoiding overtraining means matching load to recovery and noticing early when they drift apart. A review notes there are no evidence-based means of preventing overtraining syndrome itself, but monitoring load, performance and mood can interrupt the slide from overreaching (2).

Adapted from the consensus advice to coaches and physicians (1):

• Keep training records, and cut intensity or volume, or take a full rest day, when performance drops or fatigue is excessive.

• Avoid monotony: vary sessions instead of repeating the same hard workout.

• Prioritize sleep, food and hydration, especially in heavy weeks.

• Count life stress as load: travel, a move, work pressure or family difficulties.

• Ease off or pause when you have an infection, and allow time to recover after illness or injury.

• Use short mood and well-being check-ins regularly.

Mood checks have some support. The review reports, citing earlier swimming studies we have not checked directly, that when coaches cut training load whenever mood scores fell, the rate of "burnout" in collegiate swimmers dropped from 10% to zero (2). That is second-hand, old data from one sport, but it fits the systematic review showing subjective measures track load better than most objective markers (5).

Living with overtraining: the questions people ask next

Is overtraining real, or just an excuse to skip workouts?

Overtraining is recognized in sports medicine: the European College of Sport Science and the American College of Sports Medicine published a joint consensus statement on it (1). The full syndrome is uncommon; a clinical review describes overtraining syndrome as very rare (2). Non-functional overreaching is much more common: the review, citing an earlier survey we report second-hand, gives lifetime rates of about 60% in elite runners and a third in non-elite female runners. So feeling burnt out from training is real and common, and the full syndrome is the uncommon end of it. Neither is laziness.

Is doing push-ups every day overtraining?

Not by itself. Overtraining is defined by a lasting performance drop with fatigue and mood changes that don't lift with rest, not by how often you do an exercise (1). A daily set of push-ups that you recover from, and that slowly gets easier, is not overtraining. Signs that a daily habit is outpacing recovery are soreness that builds day to day, reps going down rather than up, and more effort for the same set (2). Varying the movement and adding easier days reduces the monotony the consensus links with overreaching. Sharp or worsening joint pain needs a clinician.

Can overtraining cause anxiety?

Anxiety, irritability and restlessness are all on the symptom list for overtraining syndrome in a clinical review (2). Mood disturbance rises with training load and settles when load is reduced, according to ten years of swimmer data (4). Anxiety also has many causes unrelated to training, so if it continues after you cut back, or comes with panic, a racing heart at rest or trouble functioning, see a clinician. Anxiety around food or weight is worth raising specifically, because it can overlap with energy deficiency (10).

Can I keep exercising lightly while I recover from overtraining?

Often yes, decided with whoever is assessing you. The consensus says reduced training may be enough in some cases of overreaching, while overtraining syndrome is treated with rest (1). A clinical review suggests relative rest with clear limits when complete rest raises stress or low mood (2). A practical approach: light activity should leave you the same or better the next day. If even easy walks leave you worse a day or two later, stop and tell your doctor; that pattern is closer to post-exertional malaise.

Does a sauna or massage speed up recovery from overtraining?

Neither the consensus statement nor the clinical review lists a sauna, massage, cold plunge or any recovery gadget as a treatment for overtraining syndrome. The consensus treatment is rest, plus attention to sleep, nutrition and the other causes listed by the consensus authors (1). They can make rest more pleasant but don't replace it. If you use a sauna anyway, how long to stay in a sauna and whether it helps recovery covers timing and heat precautions. Feeling faint or unwell in the heat means getting out and cooling down.

When to see a doctor about overtraining

Call 911 or go to the emergency room for chest pain or discomfort, fainting, severe shortness of breath, or a racing or irregular heartbeat with lightheadedness during or after exercise (12, 13).

Call or text 988 if low mood turns into thoughts of harming yourself (15).

Book a visit soon if you have missed periods for three months or more or cycles persistently longer than 45 days (11), bone pain that suggests a stress fracture, rapid weight loss, or fever and illness that keep coming back.

Book a routine visit if fatigue and underperformance persist after two to three weeks of real rest, or keep returning, so a clinician can look for causes such as anemia, thyroid disease, infection or depression (1). A primary care doctor can start; a sports-medicine physician is a good next step.

What to say. "My performance has dropped for [weeks] despite resting, I'm exhausted and sleeping badly, and I want to rule out other causes before I go back to training."

What to bring. A timeline of when training increased and symptoms started; your training log for recent weeks; notes on sleep, mood, appetite, weight, illnesses and, if relevant, your cycle; and life stressors in the same period.

What to ask.

• "Could anemia, iron deficiency, thyroid problems or an infection explain this?" A review lists blood count, iron studies, thyroid testing and inflammatory markers among possible screening tests (2).

• "Could I be under-fueling for my training?"

• "Should I rest completely or keep light activity, and how will we decide when I can build up again?"

If you are told you "just need to rest", it is fair to ask what will be checked if rest doesn't work, and when.

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How Welltory helps — and what it cannot do

The limits first. Welltory is a general wellness product, not a medical device. It does not diagnose, detect, predict, monitor, prevent, treat or mitigate any condition, including overtraining syndrome, REDs, anemia, thyroid disease or depression. It does not tell you whether you are overtrained, and no number in it marks that line. It can help you keep a consistent record of how your days, nights and training fit together.

You note the context; the app records the rest. When Welltory flags a stress stretch or a rest stretch on the Today screen, it asks "What happened?" or "What helped you rest?" You can tap a suggested tag, type a few words, or just talk: "race week", "heavy legs", "skipped lunch", "work deadline", "long flight", "easy walk". Welltory picks the tags out of your answer, and you can correct them before saving. Tags capture what surrounded your training, not the workout itself.

Then look at the days that follow. Resting heart rate, sleep analysis, HRV, stress minutes and Battery are recorded the same way every day (stress minutes, sleep analysis and Battery need a supported wearable), and an HRV measurement adds stress and energy readings for that moment. Set a heavy block beside the nights and mornings after it and, over a few weeks, you see your own pattern: your numbers next to your own history, not a population range and not a threshold. Since research on heart rate and HRV in overtraining is inconsistent (1), keep notes on mood, soreness and how sessions felt alongside them.

After two to three weeks of tagging, My Patterns has something to work with. My Patterns collects tags from stress and rest stretches, so it needs iOS with an Apple Watch or Oura; patterns start to appear at around seven tagged events in the current month, with some history from the month before. It shows which tagged situations tend to come with stressful stretches, which rare tags hit your body hard, day-of-week trends, heart-rate data and every time a tag occurred.

A record you made, for your doctor or coach. The Journal (Premium) keeps your measurements, tags and notes, and from the Welltory web app you can export a CSV (Dashboard → choose a chart → Export). Your own dated notes on training, sleep and mood are easier to share than memory. Any pattern is an association to discuss with them, not a cause and not a diagnosis.

The same red flags apply here, in the same type size: chest pain, fainting, or a racing heartbeat with dizziness during exercise means stopping and calling 911; missed periods for three months or more, a suspected stress fracture or rapid weight loss means a clinician; fatigue that persists despite weeks of rest needs a doctor to rule out other causes; thoughts of self-harm mean calling or texting 988 (11, 12, 15).

Where to find other people in the same situation. If the exhaustion turns out not to be about training and you are living with an energy-limiting condition, Welltory runs a paid, moderated community called Energy Lab for women aged 18 to 65 living with ME/CFS, long COVID, fibromyalgia, POTS, MCAS and similar. It runs alongside the app, with a medical board answering the science. It is education and peer support, not medical care, it does not replace your clinician, and there is a 14-day money-back guarantee on a first purchase.

How we made it

Made with AI tools, then edited and fact-checked by the Welltory team. See our Editorial & AI policy.

Data analysis by Jane Smorodnikova, co-founder of Welltory and the person who built the methodology behind how we read physiological data.

Written by Tatsiana Yashyna.

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