Welcome to HealthcareMagic forum.
To completely answer your question, I would need more information about your child's complaints. I would like to know if this abdominal pain
is only present after he drinks water or he also complains of similar symptoms on intake of other foods, drinks etc. Further, I would like to know if he has any associated nausea, vomiting
or weight loss
Importantly, I'd also like to know about how old is he and whether he has been growing normally.
If you can give me these details, I'd be able to give you a better response. I appreciate your cooperation. Thanks in advance.