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Severe headache

While I am  sleeping getting severe headache. Please tell me what could be the problem..................
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Doctor Answers (1) on Severe headache

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Dr. Chethan R S Bangalore | General Physician
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Hi, Headaches are generally classified by cause:

Primary headaches
A primary headache is caused by problems with or overactivity of pain-sensitive structures in your head. A primary headache isn't a symptom of an underlying disease. Chemical activity in your brain, the nerves or blood vessels of your head outside your skull, or muscles of your head and neck — or some combination of these factors — may play a role in primary headaches. Some people may carry genes that make them more likely to develop such headaches.

Secondary headaches
A secondary headache is a symptom of a disease that can activate the pain-sensitive nerves of the head. Any number of conditions — varying greatly in severity — may cause secondary headaches.
Consult Physician...

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