Headache is defined as pain in the head or upper neck. It is one of the most common locations of pain in the body and has many causes.
There are three major categories of headaches:
- primary headaches,
- secondary headaches, and
- cranial neuralgias, facial pain, and other headaches
Headaches can have many causes, but serious causes of headaches are rare. Sometimes headaches warn of a more serious disorder. Let your health care provider know if you have sudden, severe headaches. Get medical help right away if you have a headache after a blow to your head, or if you have a headache along with a stiff neck, fever, confusion, loss of consciousness or pain in the eye or ear.
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