Proteinuria is increased levels of protein in the urine. This condition can be a sign of kidney damage.Proteins – which help build muscle and bone, regulate the amount of fluid in blood, combat infection and repair tissue – should remain in the blood. If proteins enter the urine they ultimately leave the body, which isn’t healthy. Protein gets into the urine if the kidneys aren’t working properly. Normally, glomeruli, which are tiny loops of capillaries (blood vessels) in the kidneys, filter waste products and excess water from the blood.controlling it will mean checking your blood sugar often, taking medicines as your doctor tells you to, and following a healthy eating and exercise plan. If you have high blood pressure, your doctor may tell you to take a medicine to help lower your blood pressure and protect your kidneys from further damage