Hello Charles, I am Dr. Arun and will be helping you today.Yes, there can be other causes too;1) thyroid disease2) other hormonal disorders3) idiopathic.4) medicationsFollowing are the causes (comprehensive list) of mild edema in lower legs:1) Venous valvular incompetence
2) Obstruction of the lymphatic outflow
3) Dependent edema which can occur because of the prolonged standing or sitting.
4) Congestive heart failure
5) Kidney diseases
6) Protein deficiency
10) Other hormonal disorders11) Idiopathic (no cause ascertained).Following measures may help you:
1) Avoid prolonged standing or walking for long distances in a single stretch.
2) Whenever you sit; keep your legs elevated on a chair or a sofa or stool.Do not hang the legs, otherwise gravity will increase the swelling.
3) Exercises / physical therapy
a) Lie down straight and raise your leg and feet for 10-20 seconds. Repeat this for ten times (twice a day whole set).
b) When you sit; pull the feet towards you for 10-20 seconds. Repeat it for ten times twice a day.
4) Raise leg end of your bed by 6 inches.
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
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The only heart disease associated with edema would be congestive heart failure, is that right?