Swelling and pain in the joints, especially in the knees, with difficulty sitting or bending, can happen due to arthritis, inflammation, age-related wear and tear, uric acid problems, autoimmune conditions, or sometimes vitamin deficiency and weight-related stress on the joints. Since the swelling is affecting daily activities like sitting on the toilet, it is important to get it properly evaluated rather than only using painkillers repeatedly. The best specialist to consult would usually be an orthopaedic doctor if the problem seems mainly related to the knees and movement, or a rheumatologist if there is long-term stiffness, swelling in multiple joints, or suspicion of inflammatory arthritis like rheumatoid arthritis. For temporary relief, doctors commonly use anti-inflammatory medicines, pain relievers, supportive knee exercises, and sometimes calcium or vitamin supplements, depending on the cause. Warm compresses, avoiding excessive stair climbing, reducing body weight if overweight, and using a western toilet temporarily can also reduce strain on the knees. Since long-term swelling can damage the joints gradually, it is better to get examined early so the exact reason can be identified and the treatment can be planned properly instead of only controlling pain temporarily.