Urinary protein may be caused by physiological factors such as fever, strenuous exercise, etc., and pathologic factors such as urinary tract infections and kidney diseases. 1. Physiological factors: large amounts of food containing high protein, strenuous exercise, fever and other factors may lead to increased protein content in the urine. The patient’s kidney has no organic lesions, no special treatment is needed, and the urine protein can usually turn negative by itself after rest. 2. Pathologic factors: (1) Urinary tract infection diseases: for example, cystitis or pyelonephritis, after the aggravation of the infection, it may lead to the appearance of protein in the urine, which may be accompanied by pain in urination, frequent urination, urgency, pain in urination and other symptoms. (2) Kidney disease: Glomerulonephritis, for example, can affect the filtration function of the kidneys, causing protein molecules in the blood to enter the urine, which can lead to an increase in the amount of protein in the urine, and may be accompanied by symptoms such as swelling of the lower limbs and eyelids. Urine protein may also be caused by other reasons, if the patient found positive urine protein, it is recommended to go to the regular hospital in a timely manner, complete the examination to clarify the cause of the disease, under the guidance of the doctor to the targeted treatment or therapy.