Quoted from DennisDodel:Blood drawers have always had trouble finding my veins, and they always say the same thing. "You need to drink more water". Not sure what the connection is, but I have been trying to drink more water instead of coffee and diet soda.
Soft drinks and coffee don't hydrate you as well as water. Dehydration causes your blood volume in your body to decrease, and your veins shrink due to the decreased volume of fluids in your body. That's why it's easier to find a vein when you're well hydrated.
