Tension type headache: It arises from centrally mediated neural dysfunction and does not result from either emotional or muscular tension. Nausea is and auras are generally not seen. Photophobia and phonosensitivity are common and pain is usually more diffuse and milder than in migraine.
Cluster Headache: It consists of severe brief pain periorbital headaches accompanied by tearing and nasal congestion that occur frequently over several weeks. However, cluster headaches in some patients do not fit the general pattern. Cluster headache typically affects men.
Arteriovenous Malformation: Arteriovenous malformations present with acute severe headache. Unruptured Arteriovenous malformations can present with various types of headache, including recurrent severe migraine. In addition, they may present with seizure and rarely with some neurological symptoms. Headache is usually sudden and is also a frequent manifestation of hypertensive hemorrhage, hemorrhagic stroke, and pituitary hemorrhage.
Subarachnoid Hemorrhage: Subarachnoid hemorrhage presents with severe headache. Neck stiffness, altered mental awareness and neurologic signs are also common but may be absent. A CT scan of the brain may reveal blood in subarachnoid cisterns.