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What causes severe fatigue even after doing vigorous exercises?

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Posted on Tue, 19 Jul 2016
Question: I'm tired all the time. I work out for an hour in a gym in the morning, then walk my dog, then need a nap. Feel like I need a nap all day. I take a lot of vitamins and eat pretty healthy.
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Answered by Dr. Bonnie Berger-Durnbaugh (20 minutes later)
Brief Answer:
About fatigue

Detailed Answer:
Hello and welcome,

It sounds like you have a healthy lifestyle (assuming you don't drink a lot of alcohol or smoke cigarettes). So if you find you are more fatigued than usual, and it isn't due to increased exertion, then some of the things to look into are:

1. Thyroid function. This can be tested with a blood test for TSH (thyroid stimulating hormone) and thyroxine level. Thyroid abnormalities can silently cause fatigue.

2. Get a CBC (complete blood count) to check for anemia or other abnormalities.

3. Are you getting quality sleep? If people tell you that you snore, or you find that your snort or gasp at times when sleeping or waking up, an evaluation for sinus or airway problems may help, or it might be a good idea to get a sleep study done to see if you are sleeping well.

4. Stress, anxiety, and depression can all cause fatigue, but you didn't mention anything relating to that.

5. For some people, having any kind of sugar or simple, processed carbohydrates in the morning can be followed by the blood sugar dipping too low and symptoms of hypoglycemia, which can include feeling tired. A glucose tolerance challenge test can help show this.

So, depending on which things relate to your experience, please pursue these. At minimum, get a CBC and TSH.

Please let me know if I can provide further information or clarification.
Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
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Follow up: Dr. Bonnie Berger-Durnbaugh (4 days later)
Didn't really get an answer. I've had my thyroid checked, I don't smoke or drink. So now what???
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Answered by Dr. Bonnie Berger-Durnbaugh (50 minutes later)
Brief Answer:
Consider sleep study.

Detailed Answer:
How long has it been going on? And did it follow a viral infection?

Have you had a CBC done?

How is your sleep quality? That would be the next thing to pursue.


Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
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Answered by
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Dr. Bonnie Berger-Durnbaugh

General & Family Physician

Practicing since :1991

Answered : 3134 Questions

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What causes severe fatigue even after doing vigorous exercises?

Brief Answer: About fatigue Detailed Answer: Hello and welcome, It sounds like you have a healthy lifestyle (assuming you don't drink a lot of alcohol or smoke cigarettes). So if you find you are more fatigued than usual, and it isn't due to increased exertion, then some of the things to look into are: 1. Thyroid function. This can be tested with a blood test for TSH (thyroid stimulating hormone) and thyroxine level. Thyroid abnormalities can silently cause fatigue. 2. Get a CBC (complete blood count) to check for anemia or other abnormalities. 3. Are you getting quality sleep? If people tell you that you snore, or you find that your snort or gasp at times when sleeping or waking up, an evaluation for sinus or airway problems may help, or it might be a good idea to get a sleep study done to see if you are sleeping well. 4. Stress, anxiety, and depression can all cause fatigue, but you didn't mention anything relating to that. 5. For some people, having any kind of sugar or simple, processed carbohydrates in the morning can be followed by the blood sugar dipping too low and symptoms of hypoglycemia, which can include feeling tired. A glucose tolerance challenge test can help show this. So, depending on which things relate to your experience, please pursue these. At minimum, get a CBC and TSH. Please let me know if I can provide further information or clarification.