Mild knee pain with crackling sounds and discomfort while climbing stairs for several years, with normal rheumatoid arthritis and gout tests, is commonly due to early osteoarthritis, cartilage wear, patellofemoral syndrome, or muscle weakness around the knees. Doctors may advise supplements such as Glucosamine, Chondroitin, Calcium, or vitamin D if deficiency is present. Physiotherapy, quadriceps-strengthening exercises, weight control, avoiding squatting/stairs overload, and regular low-impact exercise are very important for long-term relief. Pain relievers may be used occasionally if medically suitable. Please consult an orthopedic doctor or physiotherapist if pain worsens, swelling develops, or walking becomes difficult.