Adrenaline increases the "alertness" of the nervous system, meaning it's ready to trigger muscle contraction. It also increases the amount of blood flow and changes the tension of the muscles, which, ...
Verywell Health on MSN
Common causes of lip twitching and what to do
Too much caffeine can cause lip twitching, and cutting back on caffeinated foods and drinks can help. Certain medications, like steroids and antibiotics, can make your lip twitch. Low potassium can ...
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