My veins are really dark and show through out my whole body. could this be a cause for concern? have had bad health since gastric bypass surgery!

Weight loss: The veins may be more visible from the weight loss. The benefits of the weight loss however far outweigh the risks of the excess weight. It depends of course how much weight you've lost, when you had the bypass, and your medical conditions. I would suggest you call your surgeon for a follow-up evaluation and see if they have any suggestions. Hope this helps!