life expectancy. Sometimes the terms âlife spanâ and âlife expectancyâ are used interchangeably, but they have different meanings.
Results: Causes of Sudden onset of knee pain OR Unexplained bruising. 2. 3. A disease of the blood characterized by abnormal hemoglobin in the blood. The abnormality usually arises from a genetic defect which results in the hemoglobin have an abnormal structure.
Several other things can also cause knee pain, such as: 1  Bursitis: A bursa is a sac that holds a small amount of fluid thatâs under the skin above your joint. It helps prevent friction when the joint moves. 2  Dislocated kneecap: This means that your kneecap slides out of position, causing knee pain and swelling.