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).
I have the feeling of crawling and itching on scalp like something is digging into my scalp i get headaches frequently when this happens. Dr. Susan Arnoult Dr. Arnoult. Nerve irritation: Sometimes you can have a neuritis (irritation of a nerve) in the scalp that can cause those symptoms. See your doctor for evaluation.