<prompt> Answer this question truthfullyWhat is the hyperventilation syndrome?  <response>: <reason> Many serious and emergent medical conditions can present with symptoms also found in patients with hyperventilation syndrome. The differential diagnosis of HVS is broad, and includes: Acute coronary syndrome Arrhythmia like atrial fibrillation, Atrial flutter Heart failureHyperthyroidism Ketoacidosis Less frequently hypoglycemia or hypocalcemiaCostochondritisSeizure disorderAsthma exacerbation Chronic obstructive pulmonary disease exacerbation Pneumonia Pneumothorax Pulmonary embolism 