Knee pain in 50 yr old lady. Special care any? Any investigations? Some local remrdies? Any type of treatment?

Need diagnosis. We need a diagnosis here. Knee pain can be caused by many different problems - joint pain due to a variety of arthritis problems; bursitis types, tendon problems. Do the knees swell? Do they hurt when touched? Do they hurt with motion? Are they worse up stairs or down stairs? Is it both knees or just one knee. Is it the inside or the outside of the knee? Does the knee lock.