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Reference.org
Trigeminal autonomic cephalgia
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<p>Trigeminal autonomic cephalalgia (TAC) refers to a group of <a href="/facts/Headache/mdmmC9DP">primary headaches</a> that occurs with pain on one side of the head in the <a href="/facts/Trigeminal_nerve/YoF0qNoG">trigeminal nerve</a> area and symptoms in <a href="/facts/Autonomic_nervous_system/hdmEY1Ay">autonomic</a> systems on the same side, such as eye watering and redness or drooping eyelids. </p>