Trigeminal neuralgia typically manifests as sudden, severe facial pain, most often occurring in areas such as the upper lip, nostril, or corner of the mouth. These areas are prone to forming trigger points, and touching or stimulating these points can provoke an episode of pain. Most often, pain attacks occur when the patient is talking or eating, causing sudden cessation of the activity. The patient may experience unilateral facial muscle spasms, and reactions such as frowning, clenching teeth, opening the mouth wide, covering the eyes, or vigorously rubbing the face with the palm of the hand, leading to rough, thickened skin and eyebrow hair loss.