Congenital hepatic porphyria: A rare congenital disorder where there is an excess of porphyrin (pigments) in the body. The liver is responsible for making porpyrins.
Diabetes: Failing or reduced ability of the body to handle sugars.
Lead poisoning: A type of heavy metal poisoning caused by excessive exposure to lead.
Radial Nerve Entrapment: Compression or entrapment of the radial nerve which runs along the forearm. The problem can result from such things as bone tumors, bone fracture, trauma, lipomas or the repetition of certain arm motion. This nerve is involved in controlling various muscles in the hand, forearm and the wrist.