If your headache is one-sided and comes with a stiff neck, your neck may be contributing to the pain. Headaches can have many different causes. But when pain follows a distinct one-sided pattern that starts at the base of the neck and travels toward the eye (especially if it’s aggravated by neck movement or prolonged sitting) it’s commonly associated with what’s called a cervicogenic headache. In these cases, joint irritation, muscle tension, or limited mobility in the cervical spine can refer p