Anytime you walk into a hospital's emergency department in New York City, you can expect to see waiting rooms filled with people. Sometimes their ailments are simple ones, such the flu or an infection that can be easily taken care of with antibiotics. Others may have more severe health problems such as chest pain, equilibrium issues or injuries needing to be treated. Emergency room doctors often try to quickly diagnose a patient and send him or her on their way so that they can see the next one. However this can lead to fatal errors as one woman learned.