How do I know if my knee pain is serious?

Common symptoms of knee pain are swelling and stiffness, popping or crunching noises, weakness, and instability. In most cases of knee pain, these symptoms are pretty common. Someone with knee pain should see a doctor immediately if they can’t bear weight on their knee, have marked knee swelling, a fever, redness on the knee, or severe knee pain resulting from an injury. These are all signs that the knee pain could be a sign of a more serious condition, and it’s important to seek professional help in these cases.