Webster's New World Medical Dictionary

headache, cluster
See 
cluster headache.
headache, febrile
A headache associated with
fever. Because febrile headache can sometimes indi-
cate serious conditions such as inflammation of the
brain (encephalitis), a person who is suffering from
a febrile headache should immediately seek med-
ical attention.
headache, migraine
See 
migraine headache.
headache, muscle tension
See 
headache, 
tension.
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headache, muscle tension
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headache, rebound
A headache experienced by
someone who has taken pain relievers for migraines
or other health conditions and has built up a toler-
ance for these medications. Often a rebound
headache occurs right after the medication wears
off. Treatment involves using the medication less
frequently or switching to a different pain reliever. 
headache, sinus
A headache caused by pressure
within the sinus cavities of the head, usually in con-
nection with sinus infection. The sufferer has pain
and tenderness in the sinus area, discharge from the
nose, and sometimes a swollen face. Treatment
involves treating the underlying condition, which is
often an allergy, and using nasal vasoconstrictors
and analgesic medications.
headache, stress
See 
headache, tension.
headache, tension
A headache previously
thought to be caused by contraction of the muscles
in the back of the neck, on the scalp, and sometimes
in the jaw. The term tension-type headache is now
preferred, reflecting the fact that research has shown
that these headaches may not be related to muscle
tension. Although the cause is unknown, they are
believed to be related to the levels of neurotransmit-
ters in the brain and are possibly complicated by
tightness in muscles. Stress, lifestyle changes, and
changes in sleep patterns are among many possible
triggers.