Hi Healthy urine should be clear and straw-coloured, and shouldn t be particularly smelly Some people find that their urine smells stronger and is darker first thing in the morning when it s more concentrated, or generally when they re dehydrated If your dad has symptoms of a urinary tract infection (UTI), such as pain or a burning sensation when urinating and a need to urinate often. This is the most likely cause of unexplained foul-smelling urine. A UTI will often get better on its own, especially if you increase your fluid intake. It is less likely to get better without treatment in men than in women If your father is diabetic and if it is uncontrolled then also there are chances of UTI and which may inturn result into foul-smelling urine if it does not subside inspite of taking sufficient fluids then please get him to see by a doctor and they may carry our investigations like blood, urine culture, Ultrasound pelvis and abdomen etc and may put on antibiotics if necessary Wish you Dad good health Regards Dr Sridhar K