Welcome to Health Care Magic
It sounds like simple chest wall muscle pain
Growing pains is a colloquial term, not a medical entity......
It is advisable to have it investigated.
A thorough history and physical examination is the first step -
EKG / HOLTER (24 to 48 hour ambulatory monitoring) / ECHOcardiogram
/ TMT (Treadmill exercise EKG) / LABORATORY work-up – may all be necessary for further assessment and assistance.
The treating doctor may suggest them depending on need, based on his assessment of the situation.
Wishing speedy recovery