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).
Other neurological conditions can also cause scalp pain. Occipital neuralgia causes sudden, severe, stabbing pain in the back of the head near the neck. It may be the result of past trauma in some instances. Trigeminal neuralgia causes similar sensations in the face and front half of the scalp. Tumors of the tissues that cover the brain, called meningiomas, are a rare cause of intermittent scalp and facial pain. Trauma and Hair Loss. A blow to the head can cause temporary scalp bruising and tenderness.