your information is not sufficient to attain a clinical diagnosis but here believe are few conditions causing knee pain , osteoarthritis: pain, inflammation, and joint destruction caused by degeneration and deterioration of the joint tendinitis: pain in the front of the knee that is made worse when climbing, taking stairs, or walking up an incline bursitis: inflammation caused by repeated overuse or injury of the knee chondromalacia patella: damaged cartilage under the kneecap gout: arthritis caused by the buildup of uric acid Baker’s cyst: a buildup of synovial fluid (fluid that lubricates the joint) behind the knee rheumatoid arthritis (RA): a chronic autoimmune inflammatory disorder that causes painful swelling and can eventually cause joint deformity and bone erosion dislocation: dislocation of the kneecap most often the result of trauma meniscus tear: a rupture in one or more of the cartilage in the knee torn ligament: tear in one of the four ligaments in the knee — the most commonly injured ligament is the anterior cruciate ligament (ACL) note : please consult orthopedist , on proper examination he will diagnose it . I hope you happy with my information. , kindly rate it . thank you .