Hello I appreciate your concern and I will try to help you out in best possible way This can be caused by food poisoning or gastroenteritis, colitis or food allergy along with upper respiratory infection. I would like further information to help you better like relevant medical history has he taken any medicines or adulterated good Since how long he have this problem? Meanwhile please follow these guidelines Have dietary fiber to increase bulk of the stool. have lots of fresh fruits and steamed vegetables Avoid smoking and alcohol ask him to Wash hands with antiseptic soap or solution to maintain good hygiene Avoid fatty fried junk and cold food Have lots of fluids including ORS to counter dehydration and electrolyte imbalances for coughing and fever he may require a course of antibiotics and symptomatic treatment Please revert back to me with details I will be happy to help you Best wishes