Historical Examples. 1  What between the blow of the cougar and the force of the fall, the big-horn was dead. 2  Two Arrows wiped the blood of the cougar from the blade of his lance. 3  But now the hounds were too quick, and in a trice they had the cougar surrounded. 4  No cougar stalking its prey could have been more lithely wary.
SeveralPossibilities: Most cases of a twitching lip may be due to stress, fatigue, emotion, excessive caffeine intake or some deficiency in the diet such as potassium. Lip twitching in most cases is self-limiting, disappearing in minutes or maybe in a few days without any residual problems.
Research the causes of these symptoms that are similar to, or related to, the symptom Twitching of the lip: 1  Fasiculations. 2  Kennedy disease. 3  Lower motor neuron disease. 4  Amyotropic lateral sclerosis. 5  Organophosphate poisoning. 6  Benzodiazepine poisoning. 7  Myasthenia gravis. 8  Lyme disease.