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).
Scalp tenderness: pain occurring on and around the scalp. See detailed information below for a list of 15 causes of Scalp tenderness, Symptom Checker, including diseases and drug side effect causes. Â» Review Causes of Scalp tenderness: Causes | Symptom Checker Â» Scalp tenderness: Symptom Checker