Hello mhlongot , 
greetings from healthcaremagic.com
I am Dr Sourav Chakraborty and will be helping you with your query
As i see , you have provided only the chest X ray report along with a single symptom of chest pain , you have not revealed the duration of chest pain , any episodes of fever and if so since when , any 
cough with sputum production . These are important points to look into so as to come to a significant conclusion . I also assume you have done a baseline ECG and an 
Echocardiogram for your son and such are in normal limits , if not then plaese do get it done. Bilateral hilar prominence  are mostly seen in frequent or recurrent 
respiratory tract infections, sarcoidosis , extrinsic 
allergic alveolitis ,lymphoma, carcinoma , 
tuberculosis, mycoplasma ,organic dust disease like silicosis histocytosis x and vascular causes. His clinical examination is very important to narrow down to a significant conclusion which i lack completely for your son and interpretation is currently on very limited information provided by you . Respiratory tract infection do  present with chest 
pain while breathing but it is completely curable with proper 
antibiotic prophylaxis and rest. Please do take your son to a primary physician and get him evaluated .  You can get a chest X ray repeated around 2-3 months after your son gets treated by his doctor , chances are it might show no such hilar prominences . Do not  panic and take care.