Explanation:

Tension headaches are the most common type of headaches among adults. They are commonly referred to as stress headaches.

Explanation:

Fever is not a symptom of migraine headaches. Migraines are painful headaches often accompanied by other symptoms including nausea, vomiting, and sensitivity to light.

Explanation:

Tension headaches usually don't keep a person from performing daily tasks. An episodic tension headache may be described as a mild to moderate constant band-like pain, tightness, or pressure around the forehead or back of the head and neck. Remember, tension headaches are also commonly referred to as stress headaches.

Explanation:

Salt, allergies, milk, and aging are not typical migraine triggers. Common migraine triggers can include stress, sleep disturbances, fasting, hormones, bright or flickering lights, odors, cigarette smoke, alcohol, aged cheeses, chocolate, monosodium glutamate, nitrites, aspartame (artificial sweetener), and caffeine.

Explanation:

The trigeminal nerve is the fifth of the 12 nerves of the head. It is the main nerve of the face responsible for sensations (such as heat or pain). When activated, the trigeminal nerve causes the eye pain associated with cluster headaches. The trigeminal nerve also stimulates another group of nerves that causes the eye tearing and redness, nasal congestion, and discharge associated with cluster attacks.

Explanation:

Meningitis (an infection of the fluid surrounding the brain and spinal cord) may be a cause of the worst headache of your life. The onset is usually rapid (acute), and if untreated, the disease can be fatal within a very short period of time. The early symptoms are non-specific and flu-like. They are followed by more serious symptoms, which may include rash, stiff neck, confusion, vomiting, loss of appetite, fever, headache, and coma.
Note: Should you ever feel that you are suffering the worst headache of your life, seek immediate medical attention.

Explanation:

Sinus headaches are associated with a deep and constant pain in the cheekbones, forehead, or bridge of the nose. The pain usually intensifies with sudden head movement or straining and usually occurs with other sinus symptoms, such as nasal discharge, feeling of fullness in the ears, fever, and facial swelling.

Explanation:

The least common -- although the most severe -- type of primary headache, the pain of a cluster headache is intense and may be described as having a burning or piercing quality that is throbbing or constant. The pain is so severe that most cluster headache sufferers cannot sit still and will often pace during an attack. The pain is located behind one eye or in the eye region, without changing sides. The term "cluster headache" refers to headaches that have a characteristic grouping of attacks. Cluster headaches occur one to three times per day during a cluster period, which may last two weeks to three months. The headaches may disappear completely (go into "remission") for months or years, only to recur.

Explanation:

Scientists have identified the first-ever genetic risk factor for common migraines. People who have a specific change, or variation, in a section of DNA that helps control a brain chemical called glutamate have a significantly greater risk of developing migraines. The landmark achievement marks a significant step toward understanding the mysteries of migraines and could help pave the way for the development of new treatments for preventing the debilitating headaches.

Explanation:

Bilateral refers to having or relating to two sides. Bilateral is opposed, for example, to unilateral, which means having or relating to one side. Therefore, with respect to headaches, bilateral refers to headaches that affect both sides of the head.