Knee swelling is sometimes referred to as "water on the knee." The medical term for this condition is knee effusion. Water on the knee can result from an injury, chronic overuse, or disease.
Swelling in a knee joint may limit knee flexibility and function. For example, a person may find it difficult to fully bend or completely straighten a swollen knee, and the joint may naturally bend 15 to 25 degrees while the leg is at rest.
Depending on the underlying condition, the swollen knee may exhibit no other symptoms or it may be painful, and/or difficult to put weight on.
To learn more you should go to a specialist.
Keyword: knee swelling pain