Under normal circumstances, the human body is negative for urine protein. When urine protein (++) appears inside the human body, the specific reasons are as follows: 1. Physiological causes: proteinuria can occur under exertion, fever or stress conditions; 2. Pathological causes: mostly seen in diseases such as glomerulonephritis. If the cause is physiological, the urine protein will naturally turn negative after removing the relevant factors, such as after the fever subsides. If the cause is pathological, it is necessary to clarify whether it is caused by glomerulonephritis. If it is caused by nephritis, you should go to the nephrology department for regular treatment. You need to pay attention to rest and protein intake in your diet.