If a woman has blood when urinating, she may have a lesion in the urinary tract that causes bleeding, or she may have suffered some trauma, or her coagulation mechanism may be abnormal. 1. Urinary system infection, infection can lead to mucosal rupture and bleeding, resulting in blood in urination, usually accompanied by obvious symptoms of urinary tract irritation such as urinary frequency, urinary urgency, painful urination, etc. Urine culture is needed to confirm the diagnosis. 2. 2.Stones in the urinary system, stones cause mucosal rupture or combined with mucosal inflammation resulting in bleeding, usually accompanied by more obvious symptoms of lumbar pain or abdominal pain, further ultrasound examination of the urinary system is needed to confirm the diagnosis. 3.Urinary tract tumors, often seen in elderly patients, hematuria is generally not accompanied by any painful urination, urinary frequency, urinary urgency and other symptoms, but after the tumor increases in size, it can appear gradually painful or urinary frequency and other symptoms. 4.If trauma, such as lower back or lower abdominal trauma, causes kidney or bladder contusion resulting in bleeding, there is usually a clear history of injury. 5.When platelets are reduced and coagulation dysfunction, it can cause urinary tract bleeding resulting in hematuria, accompanied by bleeding in other parts of the body, such as blood in stool, skin mucous membrane bleeding, etc.