To immediately help the pain, try buying an ACE knee brace bandage. This will support your knee joint and enable you to walk and bend your leg with less pain. Also, try soaking in a hot tub with epsom salts. You might also want to try an OTC ointment, like Icy Hot. See a doctor as soon as you can.
The tissue are worn out to cause pain.Take rest.Use balms for temporay relief.There are siddha medicine fe complete relief.Drink lot of water,avoid fatty food.
First thing is see a doctor. Pain is a symptom that something is wrong and when it comes to joints, the longer you put off getting it looked at, the worse it can get. Try to stay off that leg as much as possible, and ice it if it swells.