Bone spurs are abnormal bony outgrowths that project from the surface of the bone. On the other hand, calcium deposits are unabsorbed amounts of calcium deposited in soft tissues around the body. These situations also cause an unfavorable condition for the bursa irritating it and leading to its inflammation.

Inflammation of the bursa is also caused due to trauma. Trauma leads to repetitive injury which in turn causes the widening of blood vessels. This causes outside objects like proteins and extra cellular fluids to enter the bursa causing bursitis.

Sometimes, bursa placed closer to the skin cells get infected with micro-organisms causing septic bursitis. This type is widely prevalent on men or those with diabetes. It is found among those who suffers from alcoholism or is undergoing steroid treatments or with certain kidney conditions. The staphylococcus aureus organisms, being found on the skin generally, cause this bursitis.

One of the most regular by-products of our body metabolism is uric acid. People suffering from gout, rheumatoid arthritis, or scleroderma are however unable to break this uric acid for body mechanism, which crystallizes and deposits in joints leading to bursitis.

Sometimes sudden injury or fall can also lead to bursitis. A hurt or injury might cause blood to leak into the bursa. This unlawful entry of the blood causes direct pain and swelling leading to bursitis. In other cases, it might also cause too much exploitation of some other joints leading to bursitis. For example, a fracture caused in your right leg might cause your left leg to carry comparatively far more body weight causing the hip joint to swell and damage the bursa in the hip position. Sometimes previous surgery also leads to this inflammation. For example a surgery around the hip or prosthetic implants in the hip can irritate bursae and cause bursitis.

We all know that with age, our body becomes less flexible especially at the joints. This inflexibility causes tendons and muscle degeneration and sometimes break down of the bursa over time. Due to body age the healing process is also delayed and sometimes it has been observed the bursa is unable to build itself back causing significant pain and discomfort.

Long hours of bearing pressure on a particular joint are also seen to be another reason behind bursitis. Carpet layers, gardeners, roofers, floor scrubbing laborers etc work on their knees for long working hours without much break. Actions like these cause sustained pressure on the bursa in the knee joint causing prepatellar bursitis. Moreover, cleaning activities by thrusting too much off the elbow around or leaning your elbows on a hard surface for long span of time also causes this inflammation.

Inflammatory diseases like rheumatoid arthritis causes degeneration of connective tissues and bones at the joints. Hence these patients are more prone to damage on their joints and easily susceptible to bursitis. The inflammation caused by osteoarthritis of the hip is also seen to be another reason for causing bursitis, known as liopsoas bursitis. Also it has been seen that in cases of abnormal joint conditions like a difference of the length in legs can impinge added stress on a bursa sac, causing bursitis.

One of the most prevalent causes for bursitis is the injury from chronic or repetitive actions or over use of a joint. Such bursitis usually occurs in the elbows and knees. For example, people like gardeners, carpenters, athletes, musicians, computer professionals etc tend to do too much of the same movement everyday and thus pressurizing the joints by extra exploitation. It is even applicable for people who are too often indulging in stair climbing, cycling, running or even standing upright for long hours at a stretch.