Headache is classified as primary and secondary headache. Primary headaches are chronic (last more than 6 months) and benign (not caused by life threatening disease). Headache is considered primary when a disease or other medical conditions does not cause the headache. Most primary headaches fall into three main types described as tension, migraine, and cluster … Continue reading Migraine Headache or Neurovascular Headache- Description, Types, Causes