Even if one knee is much larger than the other, pain is not guaranteed. One knee may appear larger than the knee swelling and stiffness. Puffiness around the bony parts of the knee appear prominent when compared with the other knee.
When the knee joint contains excess fluid, it may become difficult or painful to bend or straighten. Fluid may also show under the knee when straightened. Icing may help to decrease swelling. Heat may help relax the muscles of the knee. If an individual has injured his or her knee, he or she may note bruising on the front, sides or rear of the knee.
Bearing weight on the knee joint may be impossible and the pain unbearable. Causes of the swelling can include arthritis, injury to the ligaments of the knee, or an accident after which the body’s natural reaction is to surround the knee with a protective fluid. There could also be an underlying disease or condition. The type of fluid that accumulates around the knee depends on the underlying disease, condition or type of traumatic injury that caused the excess fluid. The swelling can, in most cases, be easily cured.