pain is clinically defined as the projection of internal and external disorder of  body.nerves of visceral organ(internal organs like heart,lung ect.) as well as somatic organs( e.g skin) are somehow connected.so the pain of internal organs is often projected outside which is called Head's Zone.Before u jump into conclusion , it is necessary to find out whehter the pain is internal or just superficial.The afferent spinal nerves of different organs get swtiched off in spinal chord and is taken further with the same single nerve which means often pain is located false, for e.g, pain of heart is not projected where heart lies but on left arm, if u have internal stomach pain, it can cause to back pain.a mild pain in the heart and not lasting for long along with pain while inhaling could be most probably cause of strain in muscle.but precaution is always better than cure.go for a check up and let ur blood sample be checked. if ur pain is a symptom of any  heart problem like heart attack then troponin level is often high but in case ur case i would not worry that much coz u r young and food isnt that bad.still u never know about any disease in detail before a thorough check-up coz there r lots of genetically transferred diseases which appear in some generations though u live a healthy life.

astu: