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).
top 10 doctor insights on why is my scalp tender to touch 1 pain in head on right side radiating from tip of forehead to scalp tender to touch and head throbs pain gets severe when lying down