My knee has been ringing recently. Sometimes it hurts to walk, but it doesn't hurt to sit or touch your knees. It keeps ringing. What happened?

Joints make noise when they exercise or do certain actions. Generally speaking, there are two possibilities. One is that the cartilage of the joint itself is worn, the secretion of joint fluid is reduced, and the surrounding soft tissues are diseased and make noises. Most of them are accompanied by pain and need medical treatment.

Suggestion:

The other is normal joint movement, noise and no pain. When we move the joint, the joint capsule will expand and produce bubbles at the same time, the negative pressure in the joint cavity will increase, the joint fluid will vibrate violently, and then it will make a sound. The joint capsule exists between the two bones of the joint like an air cushion, and also plays a role in lubrication. Noise in normal activities will not damage joints.