Possible causes of hematuria after alcohol: First, alcohol causes capillary dilation, at which time if there is extensive dilatation of bladder mucosal capillaries, a condition of hematuria may occur. Most of them appear after drinking a lot of alcohol, and the patient may also be in a state of intoxication. Alcohol-related tests and urine-related laboratory tests are needed to further confirm the diagnosis. Second, the presence of urinary tract stones, when drinking alcohol produces excessive urination, or there is too much local stimulation activity, resulting in urine bleeding. Most of them are accompanied by abnormal urination, such as pain in the lower back and abdomen, frequent urination and urgent urination, etc. Ultrasound examination of the urinary system is needed to further confirm the diagnosis. Thirdly, if you have tumor diseases such as kidney, bladder or ureter, local irritation is enhanced after drinking alcohol, which leads to mucosal bleeding, then hematuria can occur, and you need to perform CT examination of the urinary system to further exclude it.