Two heads are better than one! A cluster of heads is still better! But this cluster headache is definitely not desirable! One should not suffer from this chasing disease. It is chasing because once this headache starts, it occurs daily over a period of weeks extending up to several months! Then it may suddenly disappear and dramatically reappear during the same season in the ensuing year. Its timing is marked and it is perfect! Who or what is responsible for this cluster headache? Nothing is known for certain. But it is reasonably proven that changes in the walls of blood vessels in the head have a role to play in the advancement of the cluster headache! The brain by itself is a non-committal entity. It feels no pain. The pain of headache comes from the tissues surrounding the brain, the attaching structure at the base of the brain. The muscles, the scalp vessels, the vessel of the face and neck, may cause cluster headache. Or it may be specifically to blood vessels dilation or to inflammation of nerves behind the eyes. The pattern of cluster headaches is very interesting. There are active periods and passive periods. Headache occurs in clusters. It may be days, weeks or even months, during which headache bothers you in clusters, every other day or ten times during a particular day. Head-ache free intermission may last for several months and years. During the active period, you have to be careful about your lifestyles and discipline. Attacks may be triggered and intense suffering may bother you. The reasons may include: intake of alcohol, going to a place of high altitude, air travel, intense heat due to sunlight or due to any other reasons like taking of those items of food which are high in nitrates and many more. Since cluster headaches are a serious type of headache, you have to budget your day, in all its aspects according to a strict schedule that is suitable to you. You can only know what is suitable for you by past experience!