Women have no blood when they urinate but have blood when they wipe

Is it a worrying phenomenon if there is no blood in the urine but blood is found on the paper when wiping it with paper? The doctor said that if this happens, don't panic, adjust your mindset, and think about whether you have eaten the wrong food and caused problems with excretion. If this situation persists, you can go to the hospital for professional examination. Do not take medicine privately without knowing the cause of the disease. So why does blood appear when wiping? Let’s find out.

If there is no blood when a woman urinates but there is blood when wiping, it is considered to be hematuria, which is commonly caused by urinary tract infection and urinary stones, and is often accompanied by symptoms of frequent urination, urgency, pain and discomfort during urination. If there are no such symptoms, this situation may occur due to gynecological diseases and menstruation. It is recommended that you go to the hospital to check the routine urine test, make a clear diagnosis, and receive targeted treatment, which will be conducive to healing.

Hematuria refers to ≥ 3 red blood cells per high-power microscopic field in centrifuged urine, or more than 1 red blood cell count in non-centrifuged urine or more than 100,000 in 1-hour urine, or more than 500,000 in 12-hour urine sediment, all of which indicate an abnormal increase in red blood cells in the urine and are common urinary system symptoms. The causes include urinary tract inflammation, tuberculosis, stones or tumors, trauma, drugs, etc., which have very different effects on the body. In mild cases, only an increase in red blood cells is found under the microscope, which is called microscopic hematuria; in severe cases, the appearance is like meat washing water or contains blood clots, which is called gross hematuria. Usually, when there is 1 mL of blood per liter of urine, it can be seen with the naked eye, and the urine appears red or like meat washing water.

After discovering red urine, the first thing to do is to distinguish whether it is true hematuria or false hematuria. Some drugs can cause red urine, such as aminopyrine, phenytoin sodium, rifampicin, phenol red, etc.; it needs to be distinguished from true hematuria. In recent years, there has been an increasing trend of hematuria without obvious accompanying symptoms, most of which are glomerular hematuria, which has attracted widespread attention and research.

Causes

1. Kidney and urinary tract diseases

(1) Inflammation: acute and chronic glomerulonephritis, acute and chronic pyelonephritis, acute cystitis, urethritis, urinary tract tuberculosis, urinary tract fungal infection, etc.

(2) Stones in the renal pelvis, ureter, bladder, urethra, or anywhere else can scratch the urothelium as they move, which can easily cause hematuria and secondary infection. Large stones can cause urinary tract obstruction and even renal damage.

(3) Tumors Malignant tumors in any part of the urinary system or in adjacent organs that invade the urinary tract can cause hematuria.

(4) Trauma refers to violent injury to the urinary system.

(5) Congenital polycystic kidney disease, congenitally thin glomerular basement membrane, nephritis, and the nutcracker phenomenon (this disease is caused by congenital vascular malformations that cause the left renal vein running between the abdominal aorta and the superior mesenteric artery to be squeezed, resulting in persistent microscopic hematuria. The right renal vein flows directly into the inferior vena cava, while the left renal vein must pass through the angle formed by the abdominal aorta and the superior mesenteric artery to flow into the inferior vena cava. Normally, this angle is 45° to 60°. If this angle is congenitally too small or filled with mesenteric fat, enlarged lymph nodes, or peritoneum, it can cause the nutcracker phenomenon. Diagnosis is mainly based on CT, B-ultrasound, and renal venography. Treatment requires surgical correction).

It should be noted that red urine does not necessarily mean hematuria and needs to be carefully identified. If the urine is dark red or soy sauce color, not turbid or without precipitation, and there are only a few or no red blood cells under microscopic examination, it is seen in hemoglobinuria; brown red or wine color, not turbid, and no red blood cells under microscopic examination is seen in porphyrinuria; taking certain medications such as rhubarb, rifampicin, or eating certain red vegetables can also cause red urine, but there will be no red blood cells under microscopic examination.