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.
1 The affected side of the face may feel stiff, droop, and it becomes difficult for the eye to close. 2  Speaking of some severe causes of lip twitching, amyotrophic lateral sclerosis (ALS) comes into the discussion. 3  It is a neurological disorder that weakness the muscles, leading to disability, and eventually death.