symptoms of musculoskeletal disorders
bone, joint, and muscle disorders
Joint Pain: Single Joint
Single-joint pain in older adults is most often caused by osteoarthritis or gout. Single-joint pain in young adults or adolescents may be caused by a sexually transmitted infection such as gonorrhea. People who have sudden joint pain with swelling should be evaluated by a doctor as soon as possible so that infectious arthritis, if present, can be promptly treated. Fluid from swollen joints is usually withdrawn and tested for infection and the presence of crystals. 