Urine is red go to the doctors asap?

Red urine. If it is the only symptom and on first day, and absolutely no other abnormal feeling, it can be due to food [beets!] or blood = can be from a stone in the kidney of bladder [no pain if not causing blockage], or kidney malformation, of cancer if kidney-bladder. Infection can cause that but always with pain and frequency of urination. If lasting, need absolutely to see a doc.