Gastrointestinal diseases refer to diseases involving the gastrointestinal tract, namely the esophagus, stomach, small intestine, large intestine and rectum, and the accessory organs of digestion, the liver, gallbladder, and pancreas.

Depending on the site of the pain the doctor decides to investigate. The common causes  for pain abdomen in children include infections, worms ,gastritis, ulcer disease, reflux disease, constipation, celiac disease, milk intolerance , gall bladder stones/renal stones and inflammatory bowel disease (IBD). Also  urine infection may give to lower abdomen it.

Nutrition disorders are diseases that occur when a person’s dietary intake does not contain the right amount of nutrients for healthy functioning, or when a person cannot correctly absorb nutrients from food. Nutrition disorders can be caused by undernutrition, overnutrition or an incorrect balance of nutrients.

Nutritional problems of developing countries. … Common deficiency diseases include protein-energy malnutrition, nutritional anemias, vitamin A deficiency, iodine deficiency, and possibly others. Population subgroups at particularly high risk are the children and women of poor families.