Hematuria may be caused by urinary tract infection, urinary stones, urinary tumors and so on. 1. Urinary tract infection: for example, acute cystitis, the bladder is an organ with a rich blood supply. When acute inflammation of the bladder occurs, diffuse congestion and edema of the bladder mucosa will occur. In severe cases, the bladder mucosa will ulcerate and bleed, forming hematuria. 2. Urinary stones: when the stones are large or irregularly shaped, it is easy to cut through the mucous membrane of the urinary tract, causing bleeding in the urinary tract and manifesting the phenomenon of hematuria. 3. Urinary tumor: for example, renal pelvis tumor, tumor appears in renal pelvis, tumor invades the surrounding tissues, keeps growing and destroys blood vessels, which can cause kidney bleeding and lead to hematuria. Hematuria is characterized by painless and intermittent hematuria in late stage. In addition to the above, hematuria can also be seen in other causes such as coagulation dysfunction, etc. It is recommended to consult a doctor in time, follow the doctor’s instructions for further examination, clarify the cause under the doctor’s guidance, and actively cooperate with the doctor to deal with or treat the cause.