Resolved Question: Why do my finger joints ache/hurt?

I was 18, my fingers in my left hand pain and hurt, and when I bend / stretch them. I have not done nothing wrong, I know exactly what causes it. Its main joints. This is the place where I had to hang on my finger a bandage, because I can not live without it bending hurt it. I think it might be arthritis because it runs in my family, but I think I was young how to do it?