Which symptom is NOT characteristic of trigeminal neuralgia?

The symptom that is not characteristic of trigeminal neuralgia is related to the occurrence of sweating in the region of the forehead prior to an attack of pain. Trigeminal neuralgia is primarily characterized by sudden and severe facial pain, which can be triggered by specific stimuli, such as light touch or certain movements.

In typical cases of trigeminal neuralgia, the pain is short-lived, lasting from a few seconds to a minute, and is most often unilateral, affecting one side of the face. Additionally, patients often have specific trigger points on the skin that, when touched or stimulated, can provoke an attack of pain. However, the presence of sweating in the forehead region before an attack does not correlate with the known features of trigeminal neuralgia, making it the correct answer for this question.