Exercising releases chemicals and hormones that temporarily trigger positive feelings and emotions. But constantly getting painful headaches or migraines after your workouts can make you dread engaging in physical activity in the first place. Exercise-induced headaches typically fall into two categories: primary or secondary headaches. Most of the time, the headaches you get after a run or a particularly strenuous weightlifting session are primary headaches, which are triggered by exercise itself. They are usually harmless and can be easily treated...