Eating tomatoes does not cause occult blood in the urine. However, if eaten in large quantities, reddening of the urine may occur. Tomatoes belong to a kind of high nutritional value of vegetables, tomatoes are rich in vitamins, appropriate intake of tomatoes can play a role in increasing gastrointestinal peristalsis, improve the role of the intestinal tract. Because tomatoes contain red pigment, if a large amount of food may not be fully absorbed by the body, thus appearing in the urine red, but moderate consumption of tomatoes will not lead to urinary occult blood. Diseases with occult blood in urine may be caused by stones in the urinary system, infections, glomerulonephritis, tumors and other causes. When there is occult blood in the urine, you should go to the regular hospital in time, under the guidance of the doctor, improve the relevant examination, clarify the cause of the disease, and carry out targeted treatment.