. Hi and welcome. Thank you for your query. Swollen ankles and swollen feet are common and usually not cause for concern, particularly if you have been standing or walking a lot. But feet andankles that stay swollen or are accompanied by other symptoms could signal a serious health problem. Possible cause is LymphedemaL is filtered through the lymph nodes, which trap and destroy unwanted substances, such as bacteria. When there is a problem with the vessels or lymph nodes, however, the fluid s movement can be blocked. Untreated, lymph buildup can impair wound healing and lead to infection and deformity. Lymphedema is common following radiation therapy or removal of the lymph nodes in patients with cancer. If you have undergonecancer treatment and experience swelling, see your doctor right away.