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Headache

Headache is the feeling of sharp pain or pressure in the head or neck, sometimes accompanied by nausea, neck aches, and muscle pain. The most common type of headache is a tension headache. Some experience headaches when dehydrated, or suffering from caffeine withdrawal symptoms.
The other common type of headache is migraine. Migraine headaches are usually characterized by severe pain on one or both sides of the head, an upset stomach, and, at times, disturbed vision. After migraine, another common type of headache is the "toxic" headache produced by fever. Like other types of pain, headaches can serve as warning signals of more serious disorders.

The common causes of headache are:

Muscle Tension (Feel of Preasure or Tightness in the Muscles)
Migraine
Flu Syndrome
Poisoning (also by Alcohol or Caffeine)
Sinus headache, caused by Sinus Inlammation
Febrile Headache (Fever Headache)
Cervical Arthritis
Tic douloureux (Nerve Problem caused by Facial Pain and Spasms in Facial Muscles)

Rare Causes of headache are:

Hypertensive crisis (High blood Preasure)
Meningitis
Subarachnoid Bleeding
Temporal Arteritis

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Medical Symptoms and Signs » Symptom » Headache

Headache