A woman comes to the clinic with several days of worsening fatigue, shortness of breath, and nausea, but she does not complain of chest pain. Which potential diagnosis should the nurse consider first?

Women experiencing acute coronary syndrome (ACS) frequently present atypically, without classic chest pain. Instead, they commonly report fatigue, shortness of breath, nausea, indigestion, jaw pain, or back pain. Because these symptoms can mimic far less urgent conditions, ACS is often missed in women. A presentation of worsening fatigue, shortness of breath, and nausea over several days in any adult should trigger immediate consideration of ACS so that time-sensitive interventions such as an ECG and cardiac biomarkers can be initiated without delay. Respiratory infection is possible but would more typically include fever, cough, or upper respiratory symptoms; shortness of breath alone in the absence of infectious signs is insufficient to prioritize this diagnosis first. Gastrointestinal upset could explain nausea, but it does not adequately account for the cardiopulmonary symptom of shortness of breath or the progressive fatigue pattern. Medication side effects are a valid consideration but require a known medication history suggesting such effects; they should not be the first diagnostic consideration when a life-threatening diagnosis like ACS has not been excluded. Ruling out ACS first ensures client safety and follows the clinical reasoning principle of eliminating the most dangerous condition before attributing symptoms to a benign cause.