Knee pain on touching may be trauma, bursitis, knee arthritis and so on. 1. Trauma: violent impact can lead to local soft tissue damage and pain, and the pain will be more obvious when touching. 2. Bursitis: bursitis is an inflammation caused by damage to the bursa due to trauma, infection, rheumatism, tuberculosis and other factors, and is divided into acute bursitis and chronic bursitis. Acute bursitis develops more rapidly, the pain is more obvious, and there will be an increase in skin temperature, fever and other acute inflammatory manifestations, in the movement or pressure when the pain increases. Chronic bursitis can also appear as a clear cystic mass accompanied by pain, and the pain is aggravated when touching. 3. Knee arthritis: Knee arthritis is an inflammatory attack in the joint cavity, resulting in cartilage, bony degeneration of the disease, and age, gender, joint damage, osteoporosis, etc., the main symptoms are joint pain and limited mobility, and some are accompanied by joint deformity and joint swelling. If your knee joint hurts when you touch it, we suggest you to go to the hospital for a detailed examination and symptomatic treatment for the cause of the disease, and pay attention to the warmth of the knee joint area in normal times.