The trigeminal nerve is a cranial nerve. It arises from the brainstem, and its branches cover your face and head. The trigeminal nerve is a paired nerve — you have one on each side. Its chief function ...

In migraine, the trigeminal nerve plays a crucial role. It transmits pain signals from the brain to the face, where flare-ups occur. Migraine causes severe headaches with other symptoms like nausea ...