Elevated urine protein is not necessarily caused by nephritis, many diseases can appear elevated urine protein. The following are common: a. Urinary tract infection, urinary stones, prostatitis, etc. In this case, urine protein will be elevated in the urine routine, but most of them will be accompanied by elevated white blood cells and red blood cells, etc. At this time, after anti-infection and stone removal surgery, urine protein will gradually turn negative. Second, all kinds of nephritis. Many nephritis can lead to elevated urine protein, and is persistent, then need to further 24h urine protein quantification, kidney function and other tests to determine the severity of the disease, if necessary, also need to do kidney puncture biopsy. Third, the physiological situation. For example, high fever, strenuous exercise, cold, etc., can appear transient urine protein is normal and does not require treatment. Fourth, postural urine protein. Some young patients, especially those who are thin and tall, may have a small amount of urine protein when upright and turn negative when lying down, which also does not need treatment at this time.