Fight tension headaches

Tension headaches are one of the most common forms of headaches. They may occur at any age, but are most common in adults and adolescents. If a headache occurs two or more times a week for several months or longer, the condition is considered chronic. Tension headaches can occur when the patient also has a migraine.
Tension headaches occur when neck and scalp muscles become tense, or contract. The muscle contractions can be a response to stress, depression, a head injury, or anxiety. Any activity that causes the head to be held in one position for a long time without moving can cause a headache. Such activities include typing or other computer work, fine work with the hands, and using a microscope. Sleeping in a cold room or sleeping with the neck in an abnormal position may also trigger a tension headache.

Other causes of tension headaches include:
Alcohol
Caffeine (too much or withdrawal)
Colds and the flu
Eye strain
Excessive smoking
Fatigue
Nasal congestion
Over exertion
Sinus infection

Prevention:
Some people find relaxation exercises or meditation helpful. Keep warm if the headache is associated with cold. Use a different pillow or change sleeping positions.
Practice good posture when reading, working, or doing other activities.
Exercise the neck and shoulders frequently when typing, working on computers, or doing other close work. Get plenty of sleep and rest.