When my leg joints bend down, why is there always a thump?

Generally speaking, those who only blink and have no painful dyskinesia belong to physiological blink. During joint movement, there is no relative movement between articular surfaces, between cartilage pads and articular surfaces, between tendons and joint capsules, between tendons and bones, and between tendons and tendons. When they collide or rub against each other, they make a sound. This kind of snap caused by physiological activities of joints is physiological snap. In most people, this sound is not obvious and inaudible, but in some people, it is more obvious and sounds clearer. This is caused by individual differences. Your situation should be physiological, and you don't need special treatment, let alone panic. If necessary, you can go to the hospital for examination and do some physical therapy.

Pathological joint snapping is generally accompanied by pain around the shoulder joint and limited activity. Young people are generally related to trauma. The elderly should consider local ligament strain, joint capsule relaxation, bone spur, osteoporosis and other reasons. Generally, you should go to a regular hospital as soon as possible to find out the reason, and carry out physical therapy or local closed treatment.