It is always good to get something like this evaluated. Not only can they help the pain but it may be something that requires treatment to stop it from getting worse.
Hi, I have pain in both of my arms in the biceps and triceps for 2 years. I have had x-rays and test for inflammation. I was told it was tendonitis, went to PT, still have it and it's worse. It seems like my arms swell also, and it's painful.
I can no longer do any type of weight training or strength training with my arms. When i stopped doing that the pain went down somewhat. Maybe try to rest it for a while. Until you see a doctor, try some Advil.
As there could several causes, I want to encourage you to see a doctor and have this evaluated. Please write back and let us know what the doctor says and the next steps being taken and we will help you through the process.