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).
Before we talk about symptoms of serious head injury, letâs talk briefly about injuries to the scalp or external head injuries. Injuries to the scalp often look very scary. The scalp is rich in blood vessels and tightly adherent to the skull, so even minor injuries can bleed a great deal.efore we talk about symptoms of serious head injury, letâs talk briefly about injuries to the scalp or external head injuries. Injuries to the scalp often look very scary. The scalp is rich in blood vessels and tightly adherent to the skull, so even minor injuries can bleed a great deal.