Headache is common and can be debilitating to your lifestyle, and the causes of headache are complicated: stress, lack of sleep, dehydration, heart problems, just to name a few. There is a muscle called sternocleidomastoid (SCM for short) that may play a role to the headache you’re experiencing. The muscle origins from the base of your skull, goes around your neck, and ends up on the top of your chest bone. It has two divisions: Clavicular and Sternal, and they cause different patterns of referred pain (meaning not the actual source of pain) to your forehead, ear, around the eyebrow, or face. Patients with SCM problems often complain to me that they also experience pain behind their eyeball(s). Before you go see an eye doctor for ocular migraine, see if your symptoms match the referred pain pattern of SCM. It may just be the cause of it.