Kidney infection or pyelonephritis can develop when bacteria makes its way into kidneys, usually following a bladder infection. Acute kidney infections are less common than other urinary tract infections; they occur at a rate of 15 to 17 cases per 10,000 females and 3 to 4 cases per 10,000 males annually in U.S. The symptoms of a kidney infection are typically similar to illnesses like appendicitis and pelvic inflammatory diseases.
Urination moves waste and extra water out of the body. A change in the usual pattern of urination is a significant indication of a kidney infection. Kidneys make urine, so problems with this organ will often be visible in the excretion, and include changes in consistency and frequency. Some people experience an overwhelming, persistent urge, especially at night -- this is an early sign of a kidney infections. Color changes can also indicate an issue. Urine may be darker than usual, bubbly or foamy, and may have a bad smell. Blood or pus may be present, and one may feel pressure or discomfort while urinating.
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