Urine test suddenly has pathological casts. What's going on?

Urinary examination suddenly has pathological casts, to cause attention. Cast shows that the kidney has a problem, it is recommended that 24 hours urine protein determination, do kidney B ultrasound examination and renal function test, if necessary, may need to do renal biopsy, determine the pathological type of nephritis and then decide how to treat. Cast can definitely be determined for nephritis, what type of nephritis, need pathological support. After nephritis, it is recommended that everyone must properly control the amount of drinking water, pay attention to the low-salt diet, and also increase antibiotics appropriately. After waiting for the results of the disease examination, decide how to carry out the next treatment.