Jaundice may also be caused by colds or other mild infections which attack the liver and bile ducts and clog the proper flow of the bile.
The Kidneys.

The kidneys are another form of blood-filter, which deal chiefly with waste stuffs in the blood left from the proteins, or Meats, of our food--meat, fish, milk, cheese, bread, peas, beans, etc.

These waste-stuffs, called _urea_ and _urates_, are formed in the liver and brought in the blood to the kidneys.

These lie on either side of the backbone, opposite the small of the back, their lower ends being level with the highest point of the hip-bones, nearly six inches higher than they are usually supposed to be.

When you think you have a "pain across the kidneys," it is usually a pain in the muscles of the back much lower down, and has nothing to do with the kidneys at all.
A very large artery carries the blood from the aorta to each side of the kidney, and a large vein carries the purified blood back to the vena cava and heart.