What does it mean when you have muscles twitching in your upper arm?

Twitching can occur after physical activity because lactic acid accumulates in the muscles used during exercise. It most often affects the arms, legs, and back. Muscle twitches caused by stress and anxiety are often called “nervous ticks.” They can affect any muscle in the body.

Explanation:

a perfect upbringing he will grow up to be healthy and confident adult.