I have a pain in the moddle of my chest, usually it makes a pop noise but now its been hurting, it hurts as i move or stretch what cuold it be?

Quite a few causes: Chestwall itself, esophagus/stomache, lungs, heart, pancreas, and even liver problems can cause chest pain. In the young, more likely chestwall itself or reflux is causing pain. As we get older heart disease becomes more common cause of concern. Since u gave only limitted info, it is diiffult to tell what you have, but likely have chest wall pain--constochondirtis. Consult your doc. Good luc.