I get muscle spasms on the left side of my chest from time to time. sometimes they last for over an hour. should i be concerned?

Muscle Twitching: Muscle twitching is caused by minor muscle contractions in the area. Causes include lack of nutrients in the diet, medication side effects, lack of sleep, too much caffeine/exercise/stress, medical conditions that cause metabolic disorders, including low potassium, kidney disease, and uremia. Calcium /Magnesium supplement may help. If symptoms continue see a DR.