Blood clots in urine may be physiological, but also may be related to pathological factors such as traumatic diseases, medical injury, urinary tract infections, urinary tract tumors and so on. 1. Physiological factors: such as urine with blood clots may be a woman’s menstrual period shed the uterine lining, which is a normal phenomenon more than need to worry about. 2. Pathological factors Traumatic diseases: such as kidney contusion, urethral bladder injury, blood vessel injury rupture, short-term excessive bleeding, easy to accumulate coagulation, the symptoms of urination with blood clots. Medical injury, such as transurethral prostate surgery, transurethral cystoscopy ureteroscopy or luminal lithotripsy, can produce different degrees of friction damage to the mucous membrane of the urinary tract, which may cause the symptoms of blood clots in urination. Urinary tract infection: In severe urinary tract infection, the inflammatory factor produces irritation to the mucous membrane of the urinary tract, causing local congestion, edema and bleeding. If the blood remains in the urethra, it can coagulate into blood clots, which are flushed out during urination, causing the symptom of blood clots in urination. Urological tumors: such as bladder cancer, with the growth of the tumor invading into the bladder muscle layer and mucous membrane tissue can appear destructive bleeding, blood coagulation into blood clots, resulting in the symptom of blood clots during urination. To sum up, if blood clots appear in urination, after discharging the physiological factors, you should consult a doctor in time, improve the blood routine, urine routine, ultrasound of the urinary system and other related examinations, and find out the cause and then actively treat it, so as to avoid delaying the condition.