The main pain-sensitive structures in the head are the blood vessels, sensory nerves and nerve roots. Pain is appreciated when these are irritated, or in the case of blood vessels, when they are displaced or dilated. Pain can also arise from organs and tissues such as the skin, eye, nasal sinuses, temporomandibular joint, teeth and bone. It follows, then, that the cause of headache and facial pain is varied, though in practice the number of conditions responsible for the problem is finite and diagnosis and management is usually straightforward.
KeywordsDopamine Influenza Tuberculosis Carbon Monoxide Radionuclide
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