My mom has a big stomach. otherwise she is thin.she is not pregnant.she eats less.what has to be done?

Big stomach: If your mom is not obese but has big stomach, there may be another reason for her stomach size. It may be that it's filled with fluid or there may be some growth or organ enlargement. Some people have so called central obesity in which most of their fat deposition is distributed in the abdomen whereas peripheral fat is much less than that in the abdomen, so in absence of other cause, this is it.