Many causes of knee pain, especially those related to overuse or physical activity, respond well to self-care:
Rest and avoid activities that aggravate the pain, especially weight bearing activities.
Apply ice. First, apply it every hour for up to 15 minutes. After the first day, apply it at least 4 times per day.
Keep your knee elevated as much as possible to bring any swelling down.
Gently compress the knee by wearing an ace bandage or elastic sleeve. Either can be purchased at most pharmacies. This may reduce swelling and provide support.
Take acetaminophen for pain or ibuprofen for pain and swelling.
Sleep with a pillow underneath or between your knees.
Call your doctor if:
You cannot bear weight on your knee.
You have severe pain, even when not bearing weight.
Your knee buckles, clicks, or locks.
Your knee is deformed or misshapen.
You have a fever, redness or warmth around the knee, or significant swelling.
You have pain, swelling, numbness, tingling, or bluish discoloration in the calf below the sore knee.
You still have pain after 3 days of home treatment.