There are a few commonly seen trigger points, which when stimulated start the attack. These trigger points could be:
• Upper lip, Ala of the nose
• Forehead just above the eye, just below the lower eyelid.
• Just in front of the ear, Upper or lower gum
Touching one or more of these points, blast of cold, even a gentle breeze against the face, brushing teeth (the toothbrush touching the gums), washing face, shaving, jaw movements while talking or chewing etc bring on the attack.