Joint pain in the knees after a viral fever is usually due to temporary joint inflammation during recovery. Rest the joints, use a warm compress, do gentle movements to avoid stiffness, and stay well hydrated to help with healing. Eat nutritious food, avoid heavy activity, and gradually return to a normal routine as pain improves. If the pain is severe, persistent, or limits walking, consult a doctor to determine the cause and guide appropriate care.

Severe knee pain in osteoarthritis results from joint wear and inflammation, leading to stiffness and discomfort. Rest the knee, use a warm compress, do gentle strengthening exercises, and avoid strain, such as long standing or climbing, to reduce pain. Maintain a healthy weight, use supportive footwear, and keep your joints active within limits to improve function. Consult a doctor to suggest safe pain relief and guide proper long-term management for your condition.