I'm experiencing constant twitching in my lower middle chest and the extreme upper left part of my chest muscles, but there's no pain. Sometimes it even happens in my left arm. Should I be worried about this? What might be causing these muscle twitches?

Muscle twitching in the chest and left arm without pain is usually not a cause for concern. It could be due to muscle fatigue, stress, caffeine intake, or even dehydration. However, if the twitching persists or is accompanied by other symptoms such as chest pain, shortness of breath, or dizziness, it is important to consult a healthcare professional for further evaluation. In the meantime, you can try to alleviate the twitching by staying hydrated, reducing stress levels, and getting an adequate amount of rest.