Interstitial nephritis happens when a part of your kidneys’ filters called the tubules become swollen. It can be acute, and only happen for a short time, or chronic, and last for several weeks or months. Acute interstitial nephritis is usually caused by an allergic reaction to certain medicines. Chronic interstitial nephritis is much less common, and is usually caused by another chronic disease. The swelling that happens during the condition can lead to kidney disease and kidney failure.
Often the best way to treat this condition is to stop taking the medicine you are allergic to. Sometimes before your doctor can make a diagnosis of interstitial nephritis, your kidneys will have already been permanently damaged. Some of the most common symptoms are blood in your urine, fever, urinating less than normal, confusion, nausea, vomiting, swelling, and weight gain from fluid retention. In most cases interstitial nephritis is caught in time and you will have no permanent damage.
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