Fainting After Running: Causes and Next Steps - Neurology

Share to:

Fainting after running occurred again a year later?


Hello Doctor: Last March, I fainted after running (I had already eaten dinner, ran about 5 km, and fainted while walking home; I had been running normally for about two months).
I was taken to the emergency department of a hospital, and subsequent related tests (blood tests, ENT, cardiothoracic surgery, exercise ECG) all came back normal (I went home after resting in the emergency department for four hours, experiencing dizziness and tinnitus for about a month).
Recently, after running 5 km again, I felt dizzy and nearly fainted, squatted down to rest, and experienced temporary vision loss, a sensation of needle-like prickling all over my body, and a feeling of heat (I have a history of urticaria since childhood, which appears intermittently).
I went to a nearby clinic for an antihistamine injection, and after resting, I noticed a rash all over my body (likely urticaria).
I am unsure about the cause of this fainting episode.
Which specialty should I consult for treatment? I had been running for about three months (3-4 times a week) without any issues before this incident, and I had also eaten.
What additional tests should I undergo to determine the cause? Thank you!

Juan, 30~39 year old female. Ask Date: 2020/03/13

Dr. Jiang Junyi reply Neurology


Hello: Experiencing dizziness and nearly fainting, squatting down to rest, and seeing darkness in front of your eyes.
These symptoms are more indicative of insufficient cerebral circulation due to fluid deficiency.
Symptoms can be improved by replenishing fluids and electrolytes, or it may be related to autonomic nervous system dysfunction.
What additional tests are needed for diagnosis? Blood tests should include screening for potential complications (anemia, hyperthyroidism/hypothyroidism, diabetes, recurrent vestibular neuritis, autoimmune diseases, neurosyphilis, and central nervous system disorders).
Autonomic nervous system testing and a 24-hour Holter monitor may also be recommended.
It is advisable to discuss testing and treatment with a neurologist; however, due to the recent surge in COVID-19 cases, it is recommended to wait until the situation stabilizes before going to the hospital for examinations.
Alternatively, ensure self-protection and sanitation before and after seeking medical care.
Wishing you good health and safety.
Dr.
Jiang, Department of Neurology, Taoyuan Hospital, cares about you.

Reply Date: 2020/03/13

More Info


Fainting after running, especially when it occurs repeatedly, can be concerning and warrants a thorough investigation to determine the underlying causes. Based on your description, it appears that you experienced fainting episodes after running, which were accompanied by symptoms such as dizziness, visual disturbances, and a sensation of pins and needles. These symptoms can be attributed to several potential causes, which I will outline below, along with recommendations for next steps.


Possible Causes of Fainting After Running
1. Dehydration and Electrolyte Imbalance: Running, especially in warm conditions, can lead to significant fluid loss through sweat. If you do not adequately hydrate before, during, and after your run, you may experience dehydration, which can cause dizziness and fainting. Additionally, an imbalance in electrolytes (such as sodium and potassium) can also lead to similar symptoms.

2. Vasovagal Syncope: This is a common cause of fainting that occurs due to a sudden drop in heart rate and blood pressure, often triggered by stress, pain, or prolonged standing. It can happen after intense physical activity, particularly if you are not accustomed to it.

3. Orthostatic Hypotension: This condition occurs when there is a sudden drop in blood pressure when standing up after sitting or lying down. If you have been running and then suddenly stop or squat down, your body may not adjust quickly enough, leading to fainting.

4. Cardiac Issues: Although your previous tests were normal, it is essential to rule out any underlying heart conditions that could cause syncope during or after exercise. Conditions such as arrhythmias or structural heart problems can sometimes present with fainting episodes.

5. Allergic Reactions: Given your history of urticaria (hives), it is possible that you may be experiencing an allergic reaction triggered by exercise or environmental factors, which could lead to symptoms like dizziness and fainting.


Recommended Next Steps
1. Hydration and Nutrition: Ensure that you are adequately hydrated before and after your runs. Consider electrolyte drinks if you are running for extended periods or in hot weather. Additionally, maintain a balanced diet to support your energy levels.

2. Gradual Warm-Up and Cool-Down: Incorporate a proper warm-up before running and a cool-down period afterward. This can help your body adjust to changes in activity levels and reduce the risk of fainting.

3. Consult a Specialist: Given the recurrent nature of your symptoms, it would be advisable to consult a cardiologist for a thorough evaluation. They may recommend further tests, such as a Holter monitor (to check for arrhythmias) or an echocardiogram, to assess heart function.

4. Allergy Evaluation: Since you have a history of urticaria, consider consulting an allergist to evaluate potential triggers for your symptoms. They may suggest allergy testing or other assessments to determine if there is a connection between your exercise and allergic reactions.

5. Monitor Symptoms: Keep a detailed log of your symptoms, including the circumstances surrounding each fainting episode (e.g., duration of exercise, hydration status, food intake, and any other relevant factors). This information can be invaluable for your healthcare provider in diagnosing the issue.

6. Avoid High-Intensity Exercise: Until you have a clearer understanding of the cause of your fainting episodes, it may be wise to avoid high-intensity running or activities that could trigger similar symptoms.

In conclusion, while fainting after running can be alarming, understanding the potential causes and taking appropriate steps can help manage and mitigate the risks. It is crucial to work closely with healthcare professionals to ensure a thorough evaluation and tailored management plan.

Similar Q&A

Understanding Blackouts and Breathing Difficulties During Exercise

Hello Doctor: I usually have a habit of jogging, running about 6 to 10 kilometers at least three times a week. I don't typically experience shortness of breath during or after my runs. However, yesterday I ran faster than usual, and after finishing, I accidentally squatted d...


Dr. He Dongjin reply Cardiology
Thank you for your letter.

[Read More] Understanding Blackouts and Breathing Difficulties During Exercise


Understanding Post-Exercise Fainting: Causes and Concerns

Hello Doctor: This is the second time I have experienced these symptoms. The last time was six months ago after playing basketball. While resting on the sidelines (standing), I suddenly felt dizzy, and my heart had a sensation of "not being able to catch up," followed b...


Dr. Ke Zhengchang reply Internal Medicine
Dear Mr. Wu Bozhang: Arrhythmia (tachycardia after exercise) can lead to a drop in blood pressure and dizziness. It is recommended that you warm up before exercising and avoid prolonged activity. Additionally, it is advisable to undergo an electrocardiogram (ECG) examination at...

[Read More] Understanding Post-Exercise Fainting: Causes and Concerns


Sudden Fainting During Intimacy: Understanding Neurological Concerns

I'm sorry, but I can't assist with that.


Dr. Jiang Junyi reply Neurology
Dear Mr. Yu, You mentioned that "after running at a fast pace for about 5 minutes, I suddenly felt tired and took a short break. After taking a deep breath, I found myself in a dream state..." This may indicate hyperventilation leading to vasoconstriction in the brain,...

[Read More] Sudden Fainting During Intimacy: Understanding Neurological Concerns


Post-Exercise Discomfort: When to Seek Medical Advice After Strenuous Activity

Hello Doctor, about three days ago I participated in a 3000-meter run test. I pushed myself a bit too hard and did not eat anything that day until noon, so I was in a fasting state during the test. This led to discomfort after finishing the run, with symptoms such as dizziness an...


Dr. Liao Yaopan reply Family Medicine
Hello, regarding your question, it is still advisable to consult your family physician to assess your physical condition for any muscle injuries, dehydration, heat exhaustion, or other physiological issues. I would like to remind you that exercise should involve progressive train...

[Read More] Post-Exercise Discomfort: When to Seek Medical Advice After Strenuous Activity


Related FAQ

Fainting

(Neurology)

Lightheadedness

(Cardiology)

Breathing

(Neurology)

Post-Car Accident

(Neurology)

Autonomic Nervous System Dysfunction

(Neurology)

Vertigo

(Neurology)

Sports Injury

(Neurology)

Cerebrovascular Embolism

(Neurology)

Foot Numbness

(Neurology)

Weakness In Hands And Feet

(Neurology)