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This is Dr. Diego, experienced in Internal Medicine, Pulmonary and Critical Care.
I understand your concerns. The problem you described is edema. Edema can be caused by several conditions, including congestive heart failure, renal failure, hypoalbuminemia, lipidemia, chronic venous disease, idiopathic edema. Usually your PCP test for most of this conditions. Diet is also important to avoid retention of fluids. Low salt diet is recommended. Exercise helps to mobilize fluids and improves any edema. If you have persistent symptoms you should go back to your GP for further testing. Let me know if you have any other questions.
You can talk to customer service about it. I think somebody else can help you with this.