The things that can give you pains in the chest range from trivial (soft tissue injuries) to severe and life threatening. You should really get checked out by a doctor.
Nonetheless - here are some reasons you might have pains in the chest
Skin - do you have a rash, particularly the blistery rash of "shingles"
Chest wall - have you sustained trauma (been struck) to the chest wall - you might have broken a rib or strained a muscle. This sort of pain is classically worse if you breathe or move.
Lung lining (Pleura) - some things, particularly viral illnesses can give rise to sharp pains related to the lining of the lung. This is a pain that is classically worse if you breathe or move.
Pneumothorax - air between the lung and the chest wall - can be spontaneous or relating to rib fracture
Pneumonia - chest infection
- you'd be coughing, having a fever and off your food ...
- clot in the lung - small clots can get to the periphery and cause a pleuritic chest pain
Ischaemic heart disease
- occasionally an atypical heart attack
can result in right sided pain.