What to do if i injured my shoulder during boxing, will it heal on its own?

Maybe: Ghays1: this is a tough one. Depends on the nature of the injury but most strains and contusions will improve without long term problems. First- stretch. Overhead should be pretty easy by 2 weeks afterward but reaching behind your back may take 6 weeks. If you are really weak( can't lift arm above shoulder height) after 3-4 weeks, make sure you see a shoulder specialist.