A nurse is teaching a group of clients about risk factors for developing pericarditis. Which of the following should the nurse include in the teaching?

Pericarditis is an inflammatory condition affecting the fibroserous sac enclosing the heart, often triggered by viral pathogens or post-viral autoimmune reactions. The inflammatory cascade causes fibrinous exudation, resulting in precordial chest pain that alters with position. Left unchecked, the disease can lead to pericardial effusion or constrictive cardiac physiology. A. Family history of pericarditis: Most cases of pericardial inflammation stem from acquired infectious, autoimmune, or metabolic triggers rather than inherited genetic mutations. While certain systemic autoinflammatory conditions carry genetic risks, isolated pericarditis does not follow traditional familial inheritance patterns. It is predominantly an acquired disease. B. Thyroid disease: Endocrine dysregulation commonly causes metabolic alterations or non-inflammatory pericardial effusions, particularly in severe, untreated myxedema states. It does not typically initiate acute fibrinous inflammation of the pericardial membranes. Thyroid dysfunction remains a distinct pathology from primary acute inflammatory pericarditis. C. Sedentary lifestyle: Physical inactivity strongly correlates with atherosclerotic plaque formation, coronary artery disease, and ischemic myocardial injury over time. It does not compromise the pericardial layers or provoke the acute inflammatory responses seen in pericarditis. Lack of exercise is non-causal for pericardial inflammation. D. Recent flu-like illness: Viral infections like influenza, coxsackievirus, or echovirus frequently precede pericardial irritation via direct invasion or secondary immune-complex deposition. This viral prodrome initiates inflammatory cell infiltration, causing the characteristic retrosternal pain and friction rubs. It represents a common clinical trigger for the condition.