Drinking cola urine may turn red, cola contains a lot of pigment, if you drink less water, coloured components in cola are concentrated in the urine, red urine may be formed. However, reddish urine can also be seen in pathological factors, such as urinary system infection, stones, trauma, and so on. 1. urinary system infection: if the patient suffers from inflammation, it will lead to increased permeability of blood vessels, thus causing blood to seep out of the capillaries, forming red urine. 2. stones: when the patient suffers from urinary stones, in the process of urination, resulting in ureteral local capillary breakage, is also the formation of urine red symptoms. 3. trauma: if the patient’s lower body parts have obvious trauma, in the process of urination, wound rupture, blood mixed into the urine, will also lead to urine red. Drinking cola can lead to red urine, but red urine can also be due to other reasons, if there is obvious discomfort, it is recommended to immediately go to a professional hospital, under the guidance of the doctor for examination and treatment.