Swelling

So I have pain in one shoulder and swelling in one finger that just happens at night. That’s it. My finger swelling hurts and so does my shoulder but I heard underactive thyroid can cause these symptoms but I’ve been on levythyroxine for that and my levels were just checked and they’re perfectly fine. I tend to be an over thinker so I really hope this isn’t rheumatoid arthritis or anything. Please help! I know you aren’t doctors. Just wanted an extra opinion 🙂