The knee ringing when squatting is not necessarily a disease, most people squatting knee ringing is a normal ringing sound produced by the tendons around the knee, there are also the following two common causes of disease: one is patellar cartilage damage, deep squatting, because the friction of the cartilage will lead to a click, click, click, click, click, click. The other is meniscal damage, which causes the knee to rattle when squatting. You can identify this by yourself in the following way, deep squatting knee ringing is not accompanied by pain, just a crisp snap is generally not a problem. You can also use your hand to hold the knee when squatting or standing up, ringing and pain at the same time, consider the possibility of patellofemoral cartilage injury. Meniscus injury is often combined with knee interlocking, in addition to ringing, when the knee is accidentally stuck at a certain angle.