The specifics of what happens when there is blood when relieving urine are based on the patient’s specific condition. It is mainly based on the severity of the hematuria, as well as the duration of the blood discharge. For example, some patients may have painless gross hematuria throughout. This kind of hematuria is often related to urinary tract tumors and other related diseases, for example, bladder tumors are more likely to cause this kind of hematuria. If the patient has hematuria at the beginning of urination and there is pain during urination, the blood in urine may be caused by diseases such as urethritis. Other patients may have terminal hematuria, which means that there is blood at the end of urination. This is often due to inflammatory diseases of the bladder triangle or bladder neck, the posterior urethra and other lesions.