Headache is the symptom of pain anywhere in the area of the head or neck. It occurs in migraines (sharp, or throbbing pains), tension-type headaches, and cluster headaches. Frequent headaches can affect employment and relationships. There's also an increased risk of depression in people who have severe headaches.

Headaches can happen as a consequence of several ailments whether severe or not. There are a range of different classification systems such as headaches. The most well-recognized is that of the International Headache Society. Causes of headaches might include fatigue, sleep deprivation, anxiety, the effects of drugs, the effects of psychiatric drugs, viral diseases, loud noises, frequent colds, headache, rapid ingestion of a rather cold food or drink, and sinus or dental problems.

Treatment of a headache depends on the underlying cause, but commonly involves pain medication. Some form of headache is one of the most commonly experienced of all physical discomforts.

Headache is pain in any region of the head. Headaches may occur on one or both sides of the head, be isolated to a certain location, radiate across the head from one point, or have a viselike quality.

A headache may appear as a sharp pain, a throbbing sensation or a dull ache. Headaches can develop gradually or suddenly, and may last from less than an hour to several days.

Your headache symptoms can help your doctor determine its origin and the proper therapy. Most headaches are not the consequence of a significant illness, but some might result from a life threatening illness requiring emergency care.
Headaches are generally classified by cause:

Primary headaches

A primary headache is due to overactivity of or difficulties with pain-sensitive structures in the head. A primary headache is not a symptom of an underlying illness.

Chemical action in brain, the nerves or blood vessels enclosing your skull, or even the muscles of the neck and head (or any combination of those variables) may play a part in primary headaches. Some people could also carry genes which make them more inclined to come up with such headaches.

The most common primary headaches are:

Cluster headache
Tension headache(also known as tension-type headache)
Trigeminal autonomic cephalalgia (TAC), such as cluster headache and paroxysmal hemicrania
A couple of headache patterns are also generally considered kinds of primary headache, but are somewhat less common. These headaches have different attributes, like an irregular duration or pain related to a specific activity.

Although generally considered main, each might be an indication of an underlying illness. They comprise:

Chronic daily headache (for example, chronic migraine, chronic tension-type headache, or hemicranias continua)
Cough headache
Exercise headache
Sex headache
Some primary headaches can occur through lifestyle factors, including:

Skipped meals
Stress
Alcohol, particularly red wine
Certain foods, such as processed meats that contain nitrates
Changes in sleep or lack of sleep
Poor posture
Secondary headaches

A secondary headache is a symptom of a disorder that may trigger the pain-sensitive nerves of the head. Any variety of ailments -- changing greatly in severity -- can lead to secondary headaches.
Possible causes of secondary headaches include:

Carbon monoxide poisoning
Chiari malformation (structural problem at the base of your skull)
Concussion
Dehydration
Dental problems
Ear infection (middle ear)
Encephalitis (brain inflammation)
Giant cell areritis (inflammation of the lining of the arteries)
Glaucoma (acute angle closure glaucoma)
Hangovers
High blood pressure (hypertension)
Influenza (flu) and other febrile (fever) illnesses
Intracranial hematoma (blood vessel ruptures with bleeding in or around the brain)
Medications to treat other disorders
Meningitis (inflammation of the membranes and fluid surrounding your brain and spinal cord)
Monosodium glutamate (MSG)



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