Chin numbness might be indicative of a stroke or mini-stroke (transient ischemic attack), particularly if accompanied by confusion, headaches, tingling and weakness, notes WebMD. While mini-strokes are less harmful than strokes in that they do not in themselves cause irreparable damage to the brain, they tend to be more frequent. Mini-strokes also increase the risk of strokes.
Chin numbness may also be indicative of numb chin syndrome, which, although rare, could be a symptom of carcinomatous meningitis. In this case, chin numbness will often be accompanied by numbness of the lower lip. People who suspect numb chin syndrome should seek medical attention quickly. It may also be indicative of metastasized cancer.