Kidney Infection

The medical names for a kidney infection are pyelonephritis and glomerulonephritis.

Although the actual infection is located in the kidney, it often starts lower in the urinary tract--namely the bladder. Germs from the bladder migrate upward the ureters multiply when they reach the kidney. This usually happens in someone who has low resistance for some reason. 

An acute kidney infection begins with severe symptoms, but then ends quickly once it has run it's course.

However, a chronic kidney infection takes a while to develop, and gets worse as time passes. Kidney failure can ultimately result.

Glomerulonephritis

Acute glomerulonephritis involvesg an inflammation of the renal glomeruli of the kidneys. It appears to be an antigen-antibody reaction, and it results in damage in the glomerular capillaries of the kidney.

Acute glomerulonephritis typically occurs after a streptococcal infection of the respiratory tract. Sometimes a skin infection such as impetigo may precede it. A strep infection is the most common cause.

Chronic glomerulonephritis, on the other hand, progresses slowly. Charisterically, there's an inflammation of the glomeruli which causes sclerosis, scarring and finally, kidney failure. This type of kidney infection is particularly insidious because it develops over a long period of time in which no symptoms are present.

A wide variety of infections can trigger glomerulonephritis, including

• pneumonia,
• hepatitis
• measles
• malaria, and
• syphilis.

Sometimes, systemic problems or structural abnormalities in the kidney will trigger chronic glomerulonephritis.

When glomerulonephritis continues for more than a year, it's generally considered to be chronic. A person with this type of kidney infection may live a normal life for 20-30 years without symptoms, but at some point the kidneys become damaged to the point where they won't function. A kidney transplant or dialysis may then be necessary.

Pyelonephritis

Pyelonephritis is an inflammation of one or both kidneys that can come in three forms: acute, relapsing or chronic. It can involve complications like hypertension and ultimately,  kidney failure.

Pyelonephritis usually progresses very slowly, and patients sometimes don't notice symptoms or experience kidney dysfunction for more than 20 years after onset.

Most cases of pyelonephritis are the result of some kind of bacterial bacterial infection, often from one of many organisms that cause lower urinary tract infections. Certain conditions increase the likelihood of such an infection:  urinary tract infections, tumors, stagnant urine due to backflow from the bladder, abnormal prostate growth, diabetes mellitus, kidney stones, trauma, scars from previous infections, or even pregnancy.

Symptoms

Symptoms some kidney infections are often hard to diagnose, but signs of pyelonephritis are often acute.

• back ache
• fever or chills, 
• nausea,
• cloudy, foul smelling urine, 
• unsuual, unexplained weakness and fatigue.

Treatment

The best treatment for glomerulonephritis involves rest and antibiotics. Treatment usually goes one for one to two weeks after tests of blood, blood pressure, and the urine reveal that the kidneys have returned to normal. The patient's sodium and protein may be restricted during this time.

In the case of pyelonephritis, the most important steps involve eliminating the bacteria that's causing the infection, and unblocking any obstructions.