I always feel headache at my left side of my brain sometimes it goes to right.what could be the couse of this?

Chronic Headaches: Constant headaches should always be evaluated asap as there could be an underlying medical condition causing the pain. Use of medications like Ibuprofen and triptans on a frequent basis can cause headaches. Family history of headaches also predisposes a person to headaches. Other factors involved in headaches include stress, physical trauma, sleep disorders, and previous history of headaches.