Urine protein 3 + hospitalized for four days disappeared is possible. Urine protein 3+ may be caused by bacterial infection caused by pyelonephritis as well as renal tubular inflammation, etc. When patients are hospitalized and treated with antibiotics such as metronidazole, levofloxacin, etc., the pathogens can be effectively killed. In this case, hospitalization for four days urine protein 3 + disappeared, is a certain possibility. Urine protein 3+ can also be caused by kidney stones, polycystic kidneys or hyperthyroidism and other causes, and it is less likely that the patient will be hospitalized for only four days to make the urine protein disappear. The above mentioned diseases need patients to adhere to the treatment for a long time, in order to promote the disappearance of urine protein 3 +. The patient should go to the hospital in time and choose the appropriate method of treatment under the guidance of the doctor.