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Hi there,This is Dr Basu, experienced Internal Medicine Specialist.I am here to address your concerns and provide great service.
Bad veins will cause this problem usually.
Blood clot in the deep vein can obstruct blood return to heart and hence the swelling.
Hence you need a doppler venous ultrasound to rule out blood clot possible.
Hand an arm sleeve will help to prevent swelling in down position. Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the 5th star).Please bookmark my profile for fast, reliable and authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/