It is possible for painless hematuria to return to normal one day, but it is related to the cause of the painless hematuria. Common causes of painless hematuria include kidney cancer, bladder cancer, and due to strenuous exercise. 1. Kidney cancer: the main symptoms are intermittent painless hematuria, low back pain and abdominal mass. Hematuria caused by kidney cancer cannot be improved in one day. Hematuria proves that kidney cancer has penetrated deep into renal calyx and renal pelvis, and the most important treatment is surgery. 2. Bladder cancer: it is the most common tumor in the urinary system, and its main symptom is intermittent painless hematuria, but it is worth noting that the hematuria will stop by itself, so please do not take it lightly, and it will usually reoccur in the next urination, and the best treatment now is surgery. The best treatment is surgery. The symptoms of hematuria will not disappear in one day. 3. Strenuous exercise: hematuria occurs after strenuous exercise, and the main primary cause is renal prolapse. In addition to hematuria, there will also be back pain and other symptoms, and the resulting hematuria usually improves or even disappears the day after the exercise. There are many other causes of hematuria, such as urinary stones, urinary tract infections, coagulation disorders and other diseases. It is recommended that patients with painless hematuria consult a regular hospital in time for standardized examination and treatment under the guidance of a physician.