Not a very satisfying answer when dealing with a healthy seventeen year old child! She may consider seeing an allergist for exstive testing, if this is becoming a more frequent concern. The pattern definately sounds like a inflammatory response/possibly allergic. Taking a daily antihistamine is a one possible treatment, though determining the source of the allergy is more satisfying and long term more successful. Ruling out an allergic response, testing for fluid imbalance sources may be initiated if symptoms are unresolved.
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