The most likely cause of a red deposit in urine is hematuria. There are red cells excreted in hematuria, and when the urine is left for a period of time there may be red cells deposited at the bottom of the urine. This condition is recommended to be taken seriously, and hematuria must be examined for the cause of the appearance of hematuria. For hematuria of any age and any degree, the first thing to do is to rule out the possibility of urinary tract tumors, because for many tumors, hematuria is its most common symptom; hematuria may also be caused by urinary tract stones, urinary tract infection, trauma and other factors. It is recommended that patients must find the cause of hematuria and treat the primary disease in order to improve the symptoms of hematuria. It is important to drink more water when you have hematuria to prevent the formation of blood clots.