Yellow hands are nothing to worry about provided you have white eyes. If you do odds are your yellow hands, and feet, are a result of consistently consuming large amounts of beta carotene, probably from carrots, but in my case from papayas. This is known as carotenosis and is more common among fair skinned vegetarians and others who eat large amounts of fruits and vegetables. However you should be worried if in addition to yellowish skin your eyes also have a yellowish tinge to them as this is known as jaundice and is a sign of liver problems.