Definition of Headache:

A headache is pain or discomfort in the head, scalp, or neck. Serious causes of headaches are extremely rare. Most people with headaches can feel much better by making lifestyle changes, learning ways to relax, and occasionally by taking medications.

See also:

• Cluster headache
• Migraine
• Tension headache

Common Causes:

The most common headaches are probably caused by tight, contracted muscles in your shoulders, neck, scalp, and jaw. These are called tension headaches. They are often related to stress, depression, or anxiety. Overworking, not getting enough sleep, missing meals, and using alcohol or street drugs can make you more susceptible to them. Headaches can be triggered by chocolate, cheese, and monosodium glutamate (MSG). People who drink caffeine can have headaches when they don't get their usual daily amount.

Other common causes include:

• Holding your head in one position for a long time, like at a computer, microscope, or typewriter
• Poor sleep position
• Overexerting yourself
• Clenching or grinding your teeth

Tension headaches tend to be on both sides of your head. They often start at the back of your head and spread forward. The pain may feel dull or squeezing, like a tight band or vice. Your shoulders, neck, or jaw may feel tight and sore. The pain is usually persistent, but does not get worse with activity.

Migraine headaches are severe headaches that usually occur with other symptoms such as visual disturbances or nausea. The pain may be described as throbbing, pounding, or pulsating. It tends to begin on one side of your head, although it may spread to both sides. You may have an "aura" (a group of warning symptoms that start before your headache). The pain usually gets worse as you try to move around. For more information on this type of headache, see: migraine.

Other types of headaches:

• Cluster headaches are sharp, extremely painful headaches that tend to occur several times per day for months and then go away for a similar period. They are far less common.
• Sinus headaches cause pain in the front of your head and face. They are due to inflammation in the sinus passages that lie behind the cheeks, nose, and eyes. The pain tends to be worse when you bend forward and when you first wake up in the morning. Postnasal drip, sore throat, and nasal discharge usually occur with these headaches.

Headaches may occur if you have a cold, the flu, fever, or premenstrual syndrome.

If you are over age 50 and are experiencing headaches for the first time, a condition called temporal arteritis may prove to be the cause. Symptoms of this condition include impaired vision and pain aggravated by chewing. There is a risk of becoming blind with this condition. Therefore, it must be treated by your doctor right away.

Rare causes of headache include:

• Brain aneurysm -- a weakening of the wall of a blood vessel that can rupture and bleed into the brain
• Brain tumor
• Stroke or TIA
• Brain infection like meningitis or encephalitis