The American Headache Society claims that up to 78 percent of Americans suffer from tension headaches, 12 percent from migraines and 1 percent from cluster headaches. Headache pain around, behind or within either eye is suggestive of a cluster headache. Other causes might indicate medical emergencies.

Boils, or skin abscesses, are infections composed of reddened, tender areas on the skin. Often, these boils form a head filled with pus, fluid made from white blood cells, bacteria and proteins. This pus can be drained by a doctor or might spontaneously burst from the abscess.

Anger can damage the human body. A bout of anger lasting mere seconds can lead to both physical and psychological duress. Hormones rampage through the bloodstream, muscles flex tensely and the mind works overtime. The combination of these unwanted actions can result in a headache.

Headache accompanied by chest pressure is commonly seen as a result of stress or anxiety. In either situation, these psychological or emotional states bring about a wide array of feelings, ranging from frustration and nervousness to anger and fear.

Ah, summertime! Fun in the sun, sleeping at the side of the pool, playing a game of softball . . . and winding up with a huge headache. If you were physically active during the brightest part of the day, or even if you were taking a nap in the sun, your body will respond to all the sun beating down on you.

Auras are visual manifestations of neurological symptoms. Flashing lights are one type of aura people report seeing, and these auras often seem to appear in either the left or the right eye.

Prednisone, or Deltasone, is a corticosteroid utilized as a headache preventative. HeadacheMigraineRelease.com suggests that Prednisone is ideal to relieve the acute pain associated with status migraines, which are migraines with an extended headache phase lasting more than 5 hours.

Classic migraines start with a warning sign, called an aura. A migraine aura occurs before the actual migraine attack. Most often, a migraine aura is characterized by visual disturbances, according to MayoClinic.com.

Passing hard stools is usually as a result of constipation or the infrequent movement of the bowels. Most healthy people have at least three bowel movements per week, according to MedlinePlus. If you are unable to have a bowel movement or are having difficulty passing stool, contact your doctor.

Pressure headaches can occur when the sinuses become congested. Colds, allergies or a sinus infections can lead to this type of headache, according to the Penn State Milton S. Hershey Medical Center.

A headache is defined as pain in any part of the head and may be described as throbbing, dull or sharp. Pain in the forehead area is common. Different types of headaches exist; based on your symptoms, your doctor can determine the cause of your headache and how to treat it.

Foods most likely to trigger headaches and migraines include wheat, milk, cheese, chocolate, coffee, sugar, peanuts, pork and chemical additives and preservatives. Fortunately, some foods do not cause or exacerbate headaches, and some can help prevent or alleviate headaches and migraines.