Causes of Decreased Appetite in Children

Loss of appetite in children—clinically termed anorexia—is a common concern among parents and pediatric providers. Unlike adult anorexia nervosa, pediatric anorexia is rarely psychiatric in origin and more often reflects transient physiological, environmental, or mild pathological factors.

Common non-pathological causes include viral upper respiratory infections, gastroenteritis, teething, and normal developmental phases such as the “physiological anorexia of toddlerhood,” which typically emerges between 18 and 36 months of age. During this period, growth velocity slows, caloric needs decrease proportionally, and children often assert autonomy through food refusal—a developmentally appropriate behavior rather than a sign of illness.

Medical conditions that warrant evaluation include chronic gastrointestinal disorders (e.g., eosinophilic esophagitis, celiac disease, inflammatory bowel disease), endocrine abnormalities (such as hypothyroidism or poorly controlled diabetes mellitus), and systemic infections like urinary tract infections or tuberculosis—particularly when accompanied by weight loss, fever, fatigue, or failure to thrive.

Psychosocial contributors—including stress related to family transitions, school entry, or parental anxiety around feeding—can also manifest as reduced oral intake. In rare cases, persistent, severe appetite suppression with significant weight loss or growth deceleration may signal underlying mood or anxiety disorders, though these remain uncommon before adolescence.

Clinical assessment should prioritize growth trajectory, dietary history, behavioral context, and red-flag symptoms. Routine laboratory testing is not indicated in otherwise healthy, growing children with isolated, short-term appetite changes. Management focuses on responsive feeding practices, minimizing pressure or coercion, maintaining structured meal routines, and addressing underlying medical or psychosocial contributors when identified.