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Trigeminal neuralgia (TN), also called tic douloureux, is a chronic pain condition that affects the trigeminal or 5th cranial nerve, one of the most widely distributed nerves in the head.
The main symptom of trigeminal neuralgia is sudden attacks of severe sharp shooting facial pain that last from a few seconds to about two minutes. The pain is often described as excruciating, similar to an electric shock. The attacks can be so severe that you're unable to do anything during them. Trigeminal neuralgia usually affects one side of the face. In rare cases it can affect both sides, although not at the same time. The pain can be in the teeth, lower jaw, upper jaw, cheek and, less commonly, in the forehead or the eye.