<Tr> <Th> Symptoms </Th> <Td> Sharp chest pain </Td> </Tr> <Tr> <Th> Causes </Th> <Td> Viral infection, pneumonia, pulmonary embolism </Td> </Tr> <Tr> <Th> Diagnostic method </Th> <Td> Chest X-ray, electrocardiogram (ECG), blood tests </Td> </Tr> <Tr> <Th> Differential diagnosis </Th> <Td> Pericarditis, heart attack, cholecystitis </Td> </Tr>

Why does my chest tighten up when i laugh