@ray666 - I'm a 80 year old woman with new uncomfortable swelling of left foot & ankle. My internist ordered a pelvic ultrasound, suggesting my tendency to grow lipomas might have caused it. She also rx 10 mg/am of Lasix.
Another possible culprit is my varicose veins from chronic constipation (tortuous colon and adhesions). @john bishop's mentioning possible "congestive heart failure, kidney disease, and liver disease" weren't discussed.
Levothyroxine has a possible side effect of heart problems with edema but I've used it for about 35 years and the edema is new.
I hope everyone's ideas result in some good solutions for you and others.