Joints are the connections between bones, and it is because of them that animals can move around. Animals are able to move around, so joints are very important. Joints can make loud sounds, such as popping, breaking, grinding, and fracturing sounds. The most common of these is the snapping sound, which can occur in the knuckles, knees, ankles, back and neck. Such shots often appear in the film, twisting the neck before the fight, the sound of breaking. There are several reasons for joint ringing 1. Gas escapes There is joint fluid in the joint that acts as a lubricant, and the fluid contains oxygen, nitrogen and carbon dioxide. When the joint is squeezed, the joint capsule expands and contracts, the gas is released quickly, forming bubbles, and there is a ringing sound. This mechanism is to prevent the joint from being squeezed again, because it is necessary to wait for the gas to return to the joint fluid before it can be squeezed again. 2, joint, tendon and ligament activity When moving, if the posture and position are not right, there will be a ringing sound. This is also a reminder that the position is not right. 3. Rough surfaces When arthritis occurs, a rough surface appears because of the loss of smooth cartilage, and a rattling sound occurs when rubbing. The first two points are physiological joint ringing, the last point is considered an abnormal state, but the cause of ageing, and is not considered pathological. The above is an objective phenomenon, but there is also a subjective phenomenon of joint ringing, because some people especially like to squeeze their fingers and make a crunchy sound. So there has long been a claim that doing so can lead to arthritis. But there is no evidence to support this, and a 2011 study comparing the condition of the knuckles of people who squeeze their joints and those who don’t concluded that squeezing, no matter how many years and how often, does not lead to arthritis in the knuckles. The results of other studies are also consistent. One doctor, Donald Unger, won the Nobel Prize for Medicine in 2009 for experimenting with his hand for so long that he squeezed the left knuckle with his right hand every day for 60 years without any adverse effects. Under normal circumstances, joint ringing is normal and nothing is wrong. Regardless of the cause, joint ringing itself does not need to be treated because it does not cause problems later in life, and there are no special exercises or supplements that can prevent it. What is really noteworthy is when the ringing is accompanied by pain, or when the ringing is accompanied by swelling, both of which require a visit to a doctor, especially for the knee. There are two possibilities when pain occurs along with a ringing knee joint 1. Meniscal tears Occur mainly in young people, especially with sports injuries. 2. Cartilage damage or wear and tear Wear and tear occurs mainly in middle-aged and older people, the most serious being osteoporosis. Cartilage wear is inevitable with age, joint ringing is not enough to worry about, it is worth worrying about the health of the knee, because osteoporosis is not treatable, but only by prevention. Knee health starts with exercise, at least twice a week, to make the knees and legs strong, especially the muscles that support them. When exercising, warm up and stretch, not too vigorously at first. Exercise shoes should also keep up with your feet and be replaced regularly, as there is wear and tear on the shoes themselves. Second and more important, is to maintain a healthy weight, as being overweight and obese is a major risk factor for osteoporosis. As long as there is no pain or swelling, there is no need to worry about ringing joints.