common causes of stomach pain include: constipation diarrhea gastroenteritis (stomach flu) acid reflux (when stomach contents leak backward into the esophagus, causing heartburn and other symptoms) kidney infection stress But if you have all test ultrasound of whole abdomen and thyroid profile test done and all reports are normal. Then problem may be gas and acidity. So, should take following precautions for prevent recurrent pain. Give your husband light and easily digestible diet. Refrain from fried and spicy foods. Don t have beans, potatoes, sweets, creams and yogurt at night. Avoid all kinds of physical activities immediately after meals. Take sufficient rest. Mental tension, worry, anxiety, greed, anger and fear should be given up and the patient must have a relaxed mind. Avoid frequent eating. Advice to take small meal at a time. Avoid drink water during meal. Intake lots of fluids to prevent constipation. Eat curd and fibres rich diet. Avoid skip meal.