glands, abusing alcohol and feature deficiency of diet D. decreased muscle groups. BUN - The metabolism of proteins produces urea, that is then eliminated with the aid of the kidneys as a component of urine. BUN or Blood Urea Nitrogen measures the quantity of urea nitrogen inside the blood. The stability of BUN degrees may be altered when you have any sickness affecting the kidneys for you to cause an increase in BUN stages within the blood. Liver disease, bleeding in the belly or intestines, a totally excessive protein weight-reduction plan and sure medications also can reason BUN levels to.