so today I reached up to grab a glass from the cupboard when I realized that I couldn't because my shoulder hurt so bad. I can't reach out in front of me and I can't even put my hat on my head with my left arm. I think this has happened to me before but it doesn't usually happen and I don't know what's wrong I'm 15 and I've asked my dad what might be wrong and he didn't have a for sure answer either. please help :)
shoulder pain not shoulder paim