Knee pain and stiffness for many years that worsens in winter, along with recent swelling, may suggest a joint condition like arthritis, so it should not be ignored. Give the knee rest, avoid activities that strain it, and apply a warm compress to reduce stiffness and discomfort. Gentle strengthening exercises and maintaining a healthy weight can help improve joint support over time. It is best to consult a doctor for proper evaluation and treatment to prevent further damage.