Arthritis Help?

my joints (mostly my knees, hip, wrists and fingers) have been acting up. I'm only 18 and my arthritis is bad already, it hurts. I was wondering how I could help prevent it from getting worse, why it's acting up, and how to help it stop hurting lol. I goto the gym a lot and it's been helping my back stop hurting but I used to play football and softball so I sorta put a lot of impact on my lower half.
Arthritis Help?
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