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There are limited options to help relieve swelling related to venous insufficiency. If not already done, it is appropriate to consider evaluation for other conditions that may exacerbate the venous insufficiency, such as heart dysfunction or thyroid disease. If another condition is present, then treatment oriented towards that condition would be appropriate.
For the venous insufficiency, if the diuretics and elevation of the leg has not helped, there are some other interventions that can be tried. It may help to use compression stockings, such as TED stockings. Regular exercise using the leg muscles can help massage the veins and improve venous return. There also is a supplement that may help, called horse chestnut.
If I can provide any additional information, please let me know.