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.
When a person experiences lip twitching it can make your lip feel like it is quivering. There are many different reasons why a person might have lip twitching that can include: 1  Irritation of the facial nerve due to trauma or injury.  Stimulation of the nerve endings that is present in the muscles of your lips.