Hematuria: blood pooling, what are the causes?

If the urine turns red during urination, has red streaks or is redder than normal, it may be hematuria. This stands for blood pooling, which can be caused by various causes. Naturally, it is an immediate shock for the person and is cause for concern about their own health. What does hematuria mean and what are the underlying causes?


  • How does it manifest itself?
  • Red or dark brown
  • One-off or regular
  • Causes of blood pooling
  • Research and treatment for hematuria

How does it manifest itself?

Often the condition suddenly announces itself, completely surprising people. It is completely different from normal blood residue after, for example, the menstrual period. It can occur in both sexes. It appears as if the urine is completely red, but it may also be that there are blood particles or strings in the urine. The type of blood pooling one has therefore largely depends on the causative source. Old blood can cause strings, causing the blood to clot. Fresh blood can be mixed with the urine, giving it a completely red color. This last variant in particular creates a lot of uncertainty, with the worst often being suspected.

Red or dark brown

Blood-red pee is clearly distinguished from dark brown pee. However, it is possible that the pee is reddish in color, even though it is not blood. Hemoglobin as part of red blood cells is replaced every approximately 100 days, where it is broken down as bilirubin. Normally this waste material will be added to the feces via the bile, giving the feces a brown color. If this substance is difficult to remove due to problems with the liver or gallbladder, the dye is removed through the urine. In that case, the pee will be dark brown in the morning and will not smell pleasant. As the day progresses, the color of the pee becomes lighter, and it can also take on a red color. This condition is called paroxysmal nocturnal hemoglobinuria and therefore has nothing to do with blood pooling. Please note that eating beetroot and other red foods can also change the color of the pee.

One-off or regular

There is a distinction between problem cases if they occur once or regularly. The more often it occurs, the greater the severity of the condition. If it occurs occasionally, it may be a temporary condition or wound that usually heals quickly. Extra attention must of course be paid to persistent blood in the urine or blood pools.

Causes of blood pooling

In women, blood in the urine can regularly occur due to menstruation or fibroids. This may also involve menstrual problems. In addition, both men and women can also experience problems with urinating blood due to various conditions. Consider the following:

  • infection of the bladder, urethra, ureter;
  • the man’s prostate grows as he ages. This compresses the urethra, causing small blood vessels to come under tension and can tear off. Blood can end up directly in the urine;
  • bladder, kidney stones or other kidney disease;
  • malignant or cancerous. Because this is always one of the possible causes, an examination of the urine will be aimed at ruling out malignant disease.

If you have regular blood tests, have yourself checked medically to rule out serious conditions. Please note that sometimes you cannot see blood in the urine, but it is present under the microscope.

Research and treatment for hematuria

Various investigations are carried out to determine what is going on. This may involve an ultrasound examination to view the kidneys. This may also involve urine and blood tests supplemented with an internal endoscopy. As the suspected cause becomes more serious, you may consider having photographs taken and a CT scan performed. Based on the aforementioned research methods, it is determined what the actual cause is. This also determines how the condition is treated.

If you have to urinate blood several times in a row, it is important to have a medical examination. To do this, make an appointment with the urologist through your GP.

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