A general idea or understanding of something: the concept of inertia; the concept of free will. See Synonyms at idea. 2. A plan or original idea: The original concept was for a building with 12 floors. 3. A unifying idea or theme, especially for a product or service: a new restaurant concept.
Upper lip twitching is caused by a sudden involuntary contraction of the muscle or muscle fibers in the lips or as a result of direct stimulation or injury, according to Health Hype. Lip twitches also result from tics, spasms and tremors. They are usually benign, but sometimes indicate an underlying condition.
Different people may experience different symptoms of lip twitching. But usually it is felt as slight tremors of only the upper lip or of the entire side of the face. Along with this, few might have numbness or some abnormal sensation of that part of the lip or curling sensation of the edges of the lips.[2]