Blood in the urine (hematuria) after drinking alcohol may be a sign of kidney damage. Other possibilities include urinary tract infection (UTI), bladder inflammation, cancer, liver disease, or other underlying medical conditions.  Certain foods, such as beets, blackberries, and fava beans, may cause your urine to turn red. Drugs like rifampin may also color your urine. Consult your doctor if you notice blood in urine.