Headache after the gym? Causes?

About 1 out of every 3-4 times I go to the gym I have a moderate headache that lingers for 1-2 hours afterwards. This is somewhat notable as I never get headaches except for when truly sick.

I am wondering about possible causes of this which would help determine how to avoid, and also wondering if the impact of this is more significant than just a little pain in the head. Probably not....?

Couple of background facts.

1. I typically wake at 7:30ish and have a slimfast shake and 1 egg + 1 egg white by 8.

2. I usually work out in the 10:30-noon range.

3. I eat a half of a Protein Plus Powerbar before the gym (maybe 20-30 minutes before getting there). And the other half on my way home.

4. Then I'll eat a variable healthy lunch

5. My workouts are usually 1-1.5 hrs and I would describe as moderate intensity, and is usually around 30 minutes (total including rest) of weights and 45 mins of cardio (5-10 min warmup, rest after weights).

6. I do not think it is a hydration issue. I drink a ton of water all the time, all day, and drink water before, during and after the gym. I sweat a TON and so try to drink a lot at the gym. Only potential issue is if my body is not processing the water fast enough during my workouts, maybe I should try to drink even more just before I workout...

7. I have not noticed a correlation between workout intensity and the headaches.

I'm guessing it has something to do with nutrition, but wondering what I need more of for breakfast (or dinner the night before?). I don't want to just blindly increase breakfast calories if not needed.

Any thoughts?
 
Is it possible that you're drinking too much water - or at least too much around the time of your workout and so needing some electrolytes to balance out? Maybe some kind of low-cal sports drink would make a difference?

Or even having something like a banana with peanut butter (would give you the protein, the fat, the carbs, and some sodium and potassium) rather than the protein bar for your pre-workout snack?
 
I agree, your body needs some sodium to process large quantities of water. It does not need to be much but the sodium and and electrolytes in something like a propel energy drink would be a good balance to the water you are drinking.
 
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