One of the main causes of sinus drainage is simply being alive. Every day the human body produces several liters of sinus fluid and mucus, and all of that natural liquid must go somewhere.
It is a area of tenderness of the scalp in which people also sometimes feel stabbing headaches. Others just feel very sore and tender to the touch. It is felt to be caused by irritation of the connective tissue which attaches the muscles of the scalp to the skull (cranium).
The stress of it causes you become tense and even your scalp becomes tight. That tight scalp inhibits circulation and is hindrance to healthy hair growth. For years hairdressers have known the best way to relieve stress and to relax the scalp. Thats why every salon visit starts with a shampoo and thorough head massage. This massage increases circulation, stimulates nerve endings, frees knots of muscle tension, relaxes connective tissue and feels great.