18.2 to 52 reason for pain

Hello,

My daughter has been having sudden intense pain which leaves her thrashing and crying almost everyday and this has no explanation, we spent a few days in hospital and everything is fine???

Today I asked what is the reason for her sudden crying, pain , thrashing
And I got the answer 18.2 to 52
Interestingly the text in clarity for 18 is
What is behind this trouble?
What is the hidden cause?
As I try to interpret myself this I would love to hear from the experts

Val