Pain in both knees for several months can happen due to muscle weakness, joint wear and tear, excess weight, vitamin D or calcium deficiency, arthritis, old injury, long-standing hours, or repeated strain on the knee joints. The discomfort may become more noticeable while climbing stairs, walking, sitting for long periods, or getting up from a chair. When pain continues for a long time, proper evaluation becomes important to identify the exact cause. Maintaining a healthy weight, avoiding excessive stair climbing, and doing gentle strengthening or stretching exercises may help reduce pressure on the knees. Warm compresses, proper footwear, and avoiding sudden heavy exercise may also help improve comfort. Calcium, vitamin D, or pain relief medicines are sometimes advised depending on the cause, but treatment should be selected only after proper medical evaluation. Please consult a doctor if there is swelling, stiffness, redness, difficulty walking, knee locking, fever, or worsening pain, as tests like X-ray or blood investigations may be needed to identify arthritis or other joint problems.