Dizzy After Workout: 7 Causes And What To Do - Medical News Today

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Medical News TodaySubscribeWhat causes dizziness after a workout?

Medically reviewed by Danielle Hildreth, RN, CPT — Written by Jayne Leonard — Updated on April 8, 2025

Causes
Recovery
Prevention
When to see a doctor
Summary

Feeling dizzy or lightheaded after a workout can be a sign of dehydration, overexertion, a fall in blood sugar, or other issues. Dizziness can also occur when using continual-motion machines.

In some instances, dizziness after exercise can indicate an underlying condition that requires treatment.

This article lists seven potential causes of dizziness after exercise. It also discusses treatments and prevention methods.

aerial view of a man swimming in a pool-1 — gorodenkoff/Getty Images

Causes of dizziness after a workout

Possible reasons for feeling dizzy after a workout include:

Overexertion

Overexertion occurs when people push themselves too hard during physical activity. Signs of overexertion include:

dizziness
feeling faint
lightheadedness
nausea
shortness of breath
thirst
vomiting

Overexertion does not just happen in gyms or exercise classes. It can happen during any physical activity.

Use of continual motion machines

The type of exercise a person does may influence whether they feel dizzy. For example, using an elliptical machine or a treadmill, both of which involve continuous movement, is more likely to cause dizziness.

Some people experience lightheadedness or dizziness when they step off the machine. They may feel like they are still moving when they are not.

This experience is called vertigo. Others experience dizziness as a symptom of motion sickness.

Dehydration

Dehydration occurs when the body loses more water than it takes in. Although dehydration is most common in children and older adults, it can affect people of any age.

Healthy adults are most likely to experience dehydration from a minor illness or intense physical activity, especially during hot weather.

Symptoms of dehydration include:

dizziness
dry mouth
extreme thirst
feeling faint or lightheaded
less frequent urination
tiredness
weakness

Even mild dehydration, which is a loss of just 1% to 2% of body weight due to water loss, can cause these symptoms. Many people think thirst is one of the first signs of dehydration, but by the time someone feels thirsty, they are already experiencing dehydration.

Lack of oxygen

Improper breathing during exercise means that some people do not take in enough oxygen to meet the needs of their muscles.

During exercise, muscles use more oxygen than usual. This is why heart rate and breathing become faster to facilitate a higher intake of oxygen.

People who do not breathe often or deeply enough can experience a lower-than-optimal level of oxygen in their brains. Dizziness is a sign that the brain requires more oxygen.

Low blood pressure

Blood pressure is the force of the blood pushing against the artery walls. In most people, healthy blood pressure is less than 120/80 millimeters of mercury (mm Hg). People with low blood pressure or hypotension will have a reading of less than 90/60 mm Hg.

Blood pressure is typically at its lowest within an hour of exercise. Some people may notice a more sudden drop, however.

In addition to dizziness, symptoms of hypotension include:

blurred vision
fainting
fatigue
loss of concentration
nausea

Vigorous activities most often cause low blood pressure, although any activity can trigger it. Some people with hypotension feel symptoms simply if they stand up too quickly.

Hypotension can be a cause of exercise-induced dizziness during pregnancy. It also results from dehydration, heart problems, and using certain medications.

»More on this:What to know about low blood pressure during pregnancy

Low blood sugar

Hypoglycemia, or low blood sugar, occurs when the level of glucose (sugar) in the blood is very low.

Sugar is the body’s primary energy source. During exercise, the muscles use more glucose than usual. As a result, some people experience low blood sugar during or after physical exertion.

Symptoms of hypoglycemia include:

dizziness
anxiety
clumsiness
fatigue
hunger
irritability
shaking
sweating

People who have not eaten much before exercising may be more likely to experience hypoglycemia. This can be a common problem for those who exercise first thing in the morning.

Heart arrhythmia

A heart arrhythmia is an abnormal heartbeat. It may cause the heart to beat too quickly, too slowly, or irregularly. Many conditions, including heart conditions and emotional stress, can cause arrhythmias.

Exercise can also trigger or worsen heart arrhythmia, particularly in people who have heart disease.

Not all arrhythmias cause symptoms, but when symptoms do occur, they include:

dizziness
change in heartbeat
fainting
lightheadedness
shortness of breath
sweating

Even when symptoms occur, it does not necessarily mean a person has a serious problem. However, it is always important to see a doctor for persistent arrhythmias.

How to recover from dizziness after a workout

The treatment for feeling dizzy after a workout depends on the underlying cause of the problem.

In some cases, recovery is quick and straightforward. In others, it may be necessary to see a doctor for further investigation and medical attention.

Rest and breathe

When dizziness occurs as a result of overexertion, improper breathing, or low blood pressure, people can try the following:

Cool down and rest for a few minutes.
Sit down and place the head between the knees, which increases blood flow to the brain.
Practice deep breathing for several minutes, making sure to inhale and exhale slowly.
When exercising, consciously practice breathing in and out in a regular rhythm.

When dizziness occurs while using a treadmill or other machine that uses continual motion, people should hold tightly to the rails and slow down until it is safe to stop. These actions may prevent dangerous falls.

Avoid walking around or driving until the dizziness subsides.

Hydrate

The only treatment for dehydration is to replace fluids and electrolytes. For most people, drinking water or a sports drink will resolve symptoms.

Some people may need an over-the-counter oral rehydration solution containing water and electrolytes.

People should drink enough fluid during the day to make their urine pale yellow. If exercising during very hot or humid weather, try to drink chilled fluids to help cool down.

To avoid dehydration in the future, people should sip fluids all day before, during, and after exercise. People can aim to drink:

A few hours before exercise: 17 to 20 ounces of water
20 to 30 minutes before exercise and during a warm-up: 8 ounces of water
During exercise: 4 to 8 ounces of fluid every 15 to 20 minutes

Drinking small amounts frequently is typically better than drinking large amounts less often.

Severe dehydration requires medical attention.

Eat something

People can boost low blood sugar levels by having something to eat. Healthy carbohydrates are best for treating low blood sugar, so people may wish to keep a banana or some dates on hand.

Drinking a glass of fruit juice may provide faster relief from the symptoms of hypoglycemia.

However, it is a good idea to follow this up with a meal or a snack containing whole grains and proteins to avoid another blood sugar crash.

Medical attention

If symptoms persist or recur despite taking steps to stop feeling dizzy after exercise, it may be necessary to speak with a doctor.

A doctor can determine any underlying reason for the dizziness, such as:

diabetes
heart problems, including arrhythmia
pregnancy
severe dehydration
severe hypoglycemia

They may prescribe medications or medical treatments for diabetes and heart problems. In cases of severe dehydration or severe hypoglycemia, it may be necessary to receive urgent treatment with intravenous fluids or intravenous glucose.

How to prevent dizziness after a workout

The following tips may reduce the risk of feeling dizzy after a workout:

increasing the intensity of workouts gradually
avoiding pushing the body too hard
practicing regular breathing during exercises
considering doing Pilates or yoga, as these activities can teach people how to regulate their breathing
drinking plenty of fluids before, during, and after workouts
having a snack of complex carbohydrates and lean proteins an hour or so before a workout
quitting smoking

When to contact a doctor

If the dizziness persists, people should contact a doctor. A doctor can investigate the problem and check for underlying health conditions.

Individuals should seek urgent medical care if they suddenly or frequently experience the symptoms of a heart arrhythmia.

It is also necessary to seek urgent care for severe symptoms of other conditions, such as:

confusion and disorientation
extreme fatigue
inability to keep down fluids
loss of consciousness

Summary

Often, feeling dizzy after a workout is not a serious cause for concern. It usually indicates that someone is overexerting themselves or has not had enough to eat or drink before exercising.

If dizziness only occurs when using a treadmill or similar machine, it can suggest vertigo.

Occasionally, feeling dizzy after a workout may mean a person has low blood pressure, especially if they are pregnant. Less commonly, dizziness after exercise indicates a heart problem or diabetes.

Individuals who experience frequent or severe dizziness should see a doctor.

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How we reviewed this article:

SourcesMedical News Today has strict sourcing guidelines and relies on peer-reviewed studies, academic research institutions, and medical journals and associations. We only use quality, credible sources to ensure content accuracy and integrity. You can learn more about how we ensure our content is accurate and current by reading our editorial policy.

Arrhythmias: Causes and triggers. (2022).https://www.nhlbi.nih.gov/health/arrhythmias/causes
Dehydration. (2022). https://www.nhs.uk/conditions/dehydration/
Hydration tips for exercise. (2023).https://www.massgeneralbrigham.org/en/about/newsroom/articles/tips-for-staying-hydrated
Low blood pressure. (2022).https://www.nhlbi.nih.gov/health-topics/low-blood-pressure
Riebl SK, et al. (2014). The hydration equation: Update on water balance and cognitive performance.https://pmc.ncbi.nlm.nih.gov/articles/PMC4207053

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Medically reviewed by Danielle Hildreth, RN, CPT — Written by Jayne Leonard — Updated on April 8, 2025

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Tag » Why Do I Get Light Headed When I Workout

Dizzy After Workout: 7 Causes And What To Do - Medical News Today

Causes of dizziness after a workout

Overexertion

Use of continual motion machines

Dehydration

Lack of oxygen

Low blood pressure

Low blood sugar

Heart arrhythmia

How to recover from dizziness after a workout

Rest and breathe

Hydrate

Eat something

Medical attention

How to prevent dizziness after a workout

When to contact a doctor

Summary

How we reviewed this article:

Latest news

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