What causes red urine?

Urine is a liquid that is normally secreted by the human body. This liquid has no effect on people because it is a waste product excreted by the human body and contains a lot of harmful substances. If too much urine accumulates in the body, it can easily burden the kidneys and bring the risk of kidney disease. For example, the color of urine is a manifestation of the health of the body. Let's take a look at why urine is red.

Normal fresh urine is light yellow in color because it contains a yellow pigment called urochrome. However, the color of urine can also be dark or light depending on the amount of water you drink. If you drink more water and urinate more, the proportion of urochrome in the urine will be smaller, and the color will be lighter; if you drink less water, the proportion of urochrome in the urine will be larger, and the color will appear yellow. If urine is left for some time, its color will become darker. This is because some of the urochrome in the urine has been oxidized into urochrome.

96%-99% of urine is water, and most of the rest is waste, such as uric acid, creatinine, etc. The normal daily urine volume of a person is 1000-2000 ml, among which men produce 1500-2000 ml per day. Women: 1000-1500 ml. The urine is light yellow in color and transparent without any precipitation or turbidity. Freshly excreted urine has a special grassy aroma, but after being left for a long time, it develops an ammonia smell due to decomposition.

Red urine When the urine turns red, it is mostly because there are red blood cells in the urine, which is medically called hematuria.

The causes of hematuria are very complicated. There are hundreds of diseases that can cause hematuria, and it is not easy to diagnose correctly.

If hematuria is accompanied by nose bleeding, bleeding gums, or skin bleeding, it may be due to a systemic bleeding disease, such as thrombocytopenia, allergic purpura, hemophilia, or even leukemia. Hematuria is just a manifestation of systemic bleeding.

If hematuria is accompanied by fever, joint swelling and pain, skin lesions, and multiple organ damage, it may be a connective tissue disease (such as systemic lupus erythematosus, nodular arteritis, etc.).

If hematuria is accompanied by hypertension, edema, and proteinuria, it is mostly glomerulonephritis.

If hematuria is accompanied by dull pain in the waist and abdomen, urgency, frequency, and pain when urinating, it is mostly a urinary tract infection or tuberculosis.

If hematuria is accompanied by distension and pain in the lower back or abdominal cramps on one side, kidney or ureteral stones are most likely the cause, especially if the patient is in so much pain that he cannot move comfortably in bed, the cause is most likely ureteral stones.