Red urine could be due to the presence of blood , or "hematouria". Blood in the urine has to be proven diagnostically with a biochemical analysis of the urine. Blood in the urine should be taken seriously because it can be a sign of urinary tract disorders (infection, tumors…).
Banal, or non-threatening causes like excessive ingestion of nutrients that contain red colors (carrots etc.) may also cause red urine. Nonetheless, you can consult your primary health provider immediately and request diagnostic examinations.