It would be nice if you could easily know what is wrong with your knee joint by differentiating it according to the different parts of the knee joint pain and the nature and extent of the pain. However, the knee joint is one of the most complex joints in the body, and according to statistics, there are more than a hundred types of knee arthritis alone that can be listed. Problems with any part of the knee joint can cause knee pain, and many knee disorders have overlapping symptoms, making it difficult to identify them based on symptoms alone without the help of clinical examination and ancillary tests. Below is a summary of the diseases corresponding to the 6 knee abnormalities. Here, for reference only, if a clear diagnosis is to be made, of course, in the doctor’s office. 1, frequent knee pain The main symptoms are: pain and swelling in the front and side of the knee; early morning stiffness that can last more than 30 minutes; pain after regular use of the knee; knee discomfort usually intensifies at night; pain in extreme cases of walking or standing; permanent bending of the knee. Possible causes: Osteoarthritis. The cause is the continuous wear and tear of joint cartilage, which hardens and thins, leading to inflammation. 2, discomfort in the knee The main symptoms are: discomfort on the inside of the knee; pain is aggravated when climbing stairs; it hurts when touched by hand, and there is a warm feeling, and there may be swelling. Possible causes: prepatellar bursitis. There are many small fluid sacs between the bone and tendons and ligaments. If the fluid sacs inside the knee experience trauma or overuse, the area will become swollen and inflamed. 3, the knee can not twist The main symptoms are: stabbing pain in the middle of the knee, increased pain when twisting from side to side; knee is “locked”, can not bend or straighten. Possible cause: Meniscus tear. The meniscus is two crescent-shaped fibrocartilage located on the medial and lateral surfaces of the tibia, which acts as a shock absorber and cushion. When the meniscus is torn, small fragments can squeeze into the joint to induce inflammation. 4, knee like a balloon bulge The main symptoms are: swelling of the knee, like a balloon not filled with air; red skin, but the pain comes from the inside of the knee and calf; the knee can not move, is “stuck”. Possible causes: The swelling is caused by the accumulation of joint fluid, and if there is arthritis, the symptoms will worsen. 5. Hot knee sensation The main symptoms are: severe pain that comes on within a few hours; redness of the skin and a shiny white lump under the skin; the joint is very hot and stiff; the symptoms last 3-10 days and come on at night; the big toe may also be affected. Possible causes: Gout. This is the most common form of arthritis, usually caused by the accumulation of uric acid in the joints to induce inflammation. The disease has a genetic predisposition, but overweight and alcohol abuse increase the risk. Sardines and beans contain large amounts of purines, which can aggravate gout symptoms. 6, knee can not jump The main symptoms are: severe pain on the back and lower side of the kneecap when walking or running; sometimes the pain is so frequent that it is difficult to sleep. Possible causes: tendonitis, caused by patellar ligament injury. The tendons are weak and prone to develop in the elderly. Athletes and dancers often use the knee area and are at higher risk of developing the disease. Being overweight and having asymmetrical leg bones can also aggravate the condition.