My 8 year old brother has stomach pain whenever he eats or drinks anything, even if its small amounts of foods or liquids,he's lost weight, and i need help with why his stomach hurts all the time?

Belly ache: Abdominal pain after meals may signal food intolerance an elimination diet may help you, try probiotics and an alkaline diet. with weight loss seek a gastroenterology since other causes such as gastritis or inflammation may coarse these symptoms

See your doctor: Weight loss in a child is always a reason for concern. He should see his doctor.

Stomach ache: Your brother needs to see a doctor about this as soon as possible.