A headache is a pain or discomfort in the head, scalp, or neck. Primary headaches are stand-alone illnesses caused directly by the over activity or problems with structures in the head that are pain-sensitive. This includes the blood vessels, muscles, and nerves of the head and neck. Common primary headaches include migraines, cluster headaches, and tension headaches. It is controlled by homoeopathic medicines and no side effect will be generated.