Many factors: The pathophysiology of headaches involves many things, from releases of certain neurotransmitters to changes in blood flow and permeability of vasculature. Subtle swelling on one side of the face or the other, and/or constriction of swelling, can give a differential subjective feeling. Thus, one side of the head/face or other may be felt to be different.
Answered 4/17/2021
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Focal headaches could be migraines but could be due to jaw, teeth, sinus mechanisms. Of value to pin down and treat the cause
Answered 4/17/2021
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4 doctors weighed in across 2 answers
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