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The bursas or serous bags are in different parts of the foot, usually between the bone and the tendon in the areas where there is greater friction, since the purpose of these bags is to avoid excessive friction of the tendons on the bone and thus facilitate movement of the tendons.

These synovial bags can be inflamed for different reasons, the most frequent cause is due to small traumatisms (microtrauma) repeated at the same point, usually related to sports and daily work. The deformities of the feet and the use of inappropriate footwear can increase the friction that support these bags and with it appears the irritation and the inflammation of these. Some diseases of the metabolism as well as rheumatic diseases also favor the appearance of this disease. Infections occur when a germ invades the bursa either from a nearby wound or through the blood.

Pain and localized swelling appear, this pain increases when the tendon near the inflamed bursa contracts and frequently rubbing against the footwear. The bursae that are most frequently affected are those around the heel, close to the calcaneus and the Achilles tendon (retroaquílea, retrocalcánea). When the cause is a germ the inflammation is usually greater and sometimes it is accompanied by fever.

It depends on the cause, when it is well known, it will be necessary to carry out a treatment of it. As general measures can be treated by anti-inflammatories and shoes change. Injections can be made with corticosteroids (infiltrations) inside the bursa. When the cause is an infection, the contents should be drained and / or the infected pouch removed by surgery, always accompanied by antibiotic treatment.