Headache is pain felt in the head that usually originates from all muscles, nerves in the body. Headaches can be started as a result of many conditions whether serious or not. There are a various classification systems for headaches. The most commoon is that of the International Headache Society. Symptoms of headaches may include fatigue, sleep deprivation, stress, the effects of medications, the effects of recreational drugs, viral infections, common colds, head injury, rapid ingestion of a very cold food or beverage,and dental or sinus issues. Treatment of a headache depends on the underlying cause, but commonly involves pain medication. Some form of headache is one of the most commonly experienced of all physical discomforts.