Pain in local areas. Bursae are small sacs that reduce the friction between the joints and tendons. If these sacs become inflamed, considerable local pain can result. This condition commonly affects joints like the shoulder and hip, and also the elbow. At times, the knee or heel may be affected, as also the shin. This condition is experienced as a dull pain in the area, which becomes acute if the affected limb is used. Non-prescription pain-killers will provide some relief, and the condition tends to resolve itself in about a fortnight.