The cause of twitching chin muscles can be caused by a tumor or blood vessel compressing the nerve, injury to a facial nerve, or a disease such as Bell's palsy, according to the Mayfield Clinic. Anxiety and stress can also cause the chin muscles to twitch.
Facial spasms can start at the chin and progress upward. The twitching is typically not painful, but it can interfere with vision and facial expressions, according to the Mayfield Clinic. Facial twitching begins with a compression of the facial nerve caused by the anterior inferior cerebellar artery. Facial muscles begin to contract when the nerve misfires.
Chin twitches can also be caused by anxiety or stress, causing muscles to involuntarily move and produce a strange sensation, according to the Calm Clinic. Stress and anxiety puts tension on the nerves and muscles which produces a rush of hormones and unusual blood flow. The muscles react to changes in pressure, body signals and nerve energy, which results in twitching.
Adrenaline, which may be associated with stress, provides the muscles with extra energy, causing twitching or involuntary movement, according to the Calm Clinic. Exercise, healthy diets, meditation, and cutting back on caffeine and stimulants may help to reduce the stress and chin twitching caused by anxiety.