1 doctor weighed in:

What causes a headache during cardio exercise?

1 doctor weighed in
Dr. Stephen Southard
Internal Medicine

In brief: Not completely clear

But it has been hypothesized that exercise leads to intracranial(in the skull) blood vessel dilation may be the culprit, similar to the cause of headache pain with migraines.
Realize there are "secondary" headaches that can be worsened with exercise that are very concerning like bleeding issues or aneurysms, though again, these are rare causes of exercise induced(worsened) headaches.

In brief: Not completely clear

But it has been hypothesized that exercise leads to intracranial(in the skull) blood vessel dilation may be the culprit, similar to the cause of headache pain with migraines.
Realize there are "secondary" headaches that can be worsened with exercise that are very concerning like bleeding issues or aneurysms, though again, these are rare causes of exercise induced(worsened) headaches.
Dr. Stephen Southard
Dr. Stephen Southard
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