There is a possibility of early osteoarthritis changes in knee joint which may cause pain as well as swelling..
Next Steps
I will suggest you to start with hot fomentation, take analgesic tablet for pain, start
calcium and
vitamin d supplements, apply analgesic ointment locally. You can also start physiotherapy for pain relief and strengthening of muscles around knee joint.. If the pain persists, you may get X ray of Knee joint..
Health Tips
Avoid heavy work, avoid sitting down, avoid Indian toilet, avoid stair climbing...