I was really into skiing when I was younger, and would go every weekend with my buddy and his dad. I tried to outrun them, fell, and tumbled. My shoulder was very badly sprained, and I couldn’t use it for like a month. Now from time to time it flares up again, and the pain comes back for a few hours. The shoulder is also much easier to sprain now, every time I fall it’s out of commission for weeks. I went to my doctor, who told me that nothing is broken and there’s nothing he can do about it.