What is less understood are headaches that arise from more favorable environmental conditions. The above BJSM survey found that runners reported the highest incidence of head pain, with weight-lifters coming in at No. 2. Both of these activities can cause primary exertional headaches,where physical strain can affect blood pressure and cerebral blood flow,and effort-induced migraine headaches,triggered by any intensity of aerobic activity, especially in warm weather, according to a 2003 review in Current Sports Medicine Reports.
Headaches From Workouts – MSN Health & Fitness – Headaches and Migraines.