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Your lip twitches when the muscles that connect to your lip contract involuntarily. Muscle twitching or spasms can occur for many reasons and may be triggered by stress, fatigue, or a side effect from a medication. Twitches of lips, eyelids, and calf muscles usually go away within a day or two, but they can sometimes be a symptom of a more serious condition or disease. If your twitch is persistent, it's a good idea to see your doctor.Helpful? 1 person found this helpful.