Subjective symptoms are those that are experienced or felt by the patient but cannot be directly observed by others. In the context of the question, an example of a subjective symptom that should be reported is chest pain. Chest pain is something the patient feels and experiences subjectively, making it important to communicate to healthcare providers for proper evaluation and treatment.
On the other hand, fever, vomiting, and rapid respiration are considered objective symptoms because they can be measured or observed by healthcare providers. While they are important to report as well, they do not fall under the category of subjective symptoms like chest pain does.