At an early age, joint pain and stiffness require a precise diagnosis (via X-rays, blood tests, or a DEXA scan) before starting targeted medications. For temporary relief, over-the-counter pain relievers like Acetaminophen or NSAIDs (such as Ibuprofen) can reduce inflammation, while topical Diclofenac gel can ease knee and shoulder pain. Supporting your bone health with daily Calcium and Vitamin D3 supplements is also highly beneficial. However, if tests reveal inflammatory arthritis or osteoporosis, you may need prescription medications like DMARDs or bone-preserving therapies. I strongly recommend physical therapy for your shoulder stiffness and consulting a physician for a personalised treatment plan.