Knee pain is discomfort or soreness in the knee joint. The knee is a hinge joint that connects the thigh bone to the shin bone, and it is one of the most complex joints in the body. Knee pain can range from mild to severe and can be acute (short-term) or chronic (long-term). It can be caused by a variety of factors, including injury, overuse, arthritis, and other medical conditions.

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Some common causes of knee pain include:

1. Osteoarthritis: This is a type of degenerative joint disease that can cause pain, stiffness, and swelling in the knees.

2. Bursitis: This is an inflammation of the bursae, which are small fluid-filled sacs that cushion the joints. Bursitis can cause pain and swelling in the knees.

3. Tendinitis: This is an inflammation of the tendons, which are the tissues that connect muscles to bones. Tendinitis can cause pain and stiffness in the knees.

4. Fractures: A fracture is a break in a bone. Fractures can occur in the knees due to a fall or other trauma.

5. Dislocations: A dislocation is when a joint becomes displaced or misaligned. Dislocations can occur in the knees due to a fall or other trauma.

6. Muscular strains: A strain is an injury to a muscle or tendon. Strains can cause pain and weakness in the knees.

7. Patellar tendinitis: This is an inflammation of the patellar tendon, which connects the kneecap to the shin bone. Patellar tendinitis can cause pain and stiffness in the knees.

8. Meniscal tears: The meniscus is a piece of cartilage that cushions the knee joint. A tear in the meniscus can cause pain, swelling, and stiffness in the knee.