The symptoms of cervicogenic headache can vary from person to person, but most people experience a dull, achy pain in the head that is usually unilateral, meaning it affects one side of the head. The pain is often described as a constant pressure or squeezing sensation that can be accompanied by neck pain and stiffness. In some cases, the pain may be triggered by certain movements or positions of the head and neck. Other symptoms can include dizziness, light sensitivity, and nausea.