In assessing Tina's gastrointestinal health, which of the following would be considered a red flag symptom?

Severe weight loss is considered a red flag symptom in the assessment of gastrointestinal health because it can indicate a serious underlying condition. Unintentional weight loss of this magnitude may suggest issues such as malignancy, malabsorption syndromes, hyperthyroidism, or chronic diseases affecting appetite or metabolism. Unlike frequent indigestion, worsening heartburn, or increased appetite, which can be common and often related to less severe conditions like dietary choices or lifestyle factors, severe weight loss raises significant concern and requires further investigation to rule out serious health issues. Identifying such red flag symptoms is critical in promptly addressing potentially life-threatening conditions.