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Causes
By Mayo Clinic staffThe exact cause of primary exercise headaches is unknown. One theory is that strenuous exercise dilates blood vessels inside the skull.
Secondary exercise headaches are caused by an underlying problem, such as:
- Bleeding in the area between the brain and the thin membranes that cover the brain (subarachnoid hemorrhage)
- Abnormalities in a blood vessel leading to or within the brain
- Cancerous or noncancerous tumors
- Intermittent obstruction of cerebrospinal fluid flow
- Reduced blood flow in the arteries feeding the heart
- Sinus infection
