The brown urine after eating mulberries is due to the high anthocyanin content in mulberries, which is caused by the body not absorbing the anthocyanin from the urine, which is usually unrelated and will soon get better on its own and is a normal phenomenon.
However, if the patient himself often has red-coloured urine with renal colic, kidney masses, interrupted urine flow, thin urine flow and difficulty in urination, he needs to seek prompt medical attention.