Sudden swelling in most of the cases is linked to twisting, fall or any direct injury to the ankle which is always accompanied by pain and inflammation. As you only have swelling then in most probability it is due to water retention, allergic reaction, insect bite, poorly fitting shoes, cellulitis, lymphatic obstruction, varicose veins or deep vein thrombosis. Follow up with a physician and take some antihistamines if it is an allergic reaction and avoid faulty foot wear and keep your legs elevated to decrease the swelling.
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