Many mechanisms: Food reactions, atmospheric pressure changes, sensitivity to perfumes, smoke, strong odors, dental or jaw problems, sinus inflammation, family susceptibility(heredity). Prior trauma to head and/or neck.
Answered 5/7/2013
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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