Headache is our most common form of pain and a major reason cited for days missed at work or school as well as visits to the doctor. Without proper treatment, headaches can be severe and interfere with daily activities.

Headaches can range in frequency and severity of pain. Some individuals may experience headaches once or twice a year, while others may experience them more than 15 days a month. Some headaches may recur or last for weeks at a time. Pain can range from mild to disabling and may be accompanied by symptoms such as nausea or increased sensitivity to noise or light.

The trigeminal nerve has three branches that conduct sensations from the scalp, the blood vessels inside and outside of the skull, the lining around the brain (the meninges), and the face, mouth, neck, ears, eyes, and throat.

Brain tissue itself lacks pain-sensitive nerves and does not feel pain. Headaches occur when pain-sensitive nerve endings called nociceptors react to headache triggers (such as stress, certain foods or odors, or use of medicines) and send messages through the trigeminal nerve to the thalamus, the brain’s “relay station” for pain sensation from all over the body. The following explains what each of these body parts does on a regular basis: