Hi there, the most common causes of lip twitching are stress, fatigue, anxiety, anger, potassium deficiency, excess stimulants like coffee, tea etc, alcohol withdrawal, cigarette withdrawal, damage or facial nerve irritation, bell’s palsy etc. causes of persistent lip twitching, are hemi facial spasm, tics and tourette syndrome. Parkinson’s disease can also cause these. You need to consult a neurologist for evaluation. Hope this helps. Take care.
In the last few weeks, I have felt the left corner of my lower lip twitching. I am an avid runner and have been told to look after my potassium intake. Also, my brother had Bell's Palsy (at a younger age) and I wonder if there's a genetic component? I will follow up with my family physician for assessment. Thank you for your response, Dr Sharma.