Not all headaches are created equal. Some can stem from stiff joints in the neck, soft tissue tightness and possibly nerve irritation. These are called cervicogenic headaches and can occur gradually or as a result of an injury. If you are experiencing a headache combined with neck pain, muscle tenderness, tenderness in your neck joints, weakness or shoulder/arm pain on the same side of the headache, you may be having a cervicogenic headache. Physical therapy and manual therapy are great tools to help get rid of your pain.