I ve frequent pains on my waist. Some say its sugar and some say its stress. Pls what might be the cause?

Many possibilities. Pains at the waist can be due to many things, because the waist contains a variety of body parts. The intestines are there, so digestive problems can cause pain (such as gall bladder disorders, food intolerances, intestinal infections). The kidneys are there, so kidney problems can cause symptoms (such as congenital abnormal kidneys, tumors, urine infections). A doctor needs to evaluate to see.