4. Swelling
Not all cases of bursitis are accompanied by swelling, but this symptom occurs more often if inflammation is the underlying cause, rather than injury. A sudden fall or a hit to the area can result in the knee becoming swollen, but this might not always be the case. However, if the bursitis is caused by an inflammatory condition or an infection, there is usually swelling. This is because the problem is occurring directly in the center of the bursae where the fluid is located.
When the fluid and the sac are damaged there is swelling caused by an infection or inflammation. These underlying causes are responsible for a condition known as septic bursitis. However, an injury alone can also lead to swelling, and if accompanied by certain other symptoms, such as specific pain in the knee area and restricted movement, the swelling can be a sign of bursitis.