Causes of loss of appetite in a teenager

Ask about the whole pattern rather than food alone. Influenza or COVID-19 may bring fever, fatigue, nausea, or altered taste. Gastritis, Gastroenteritis, or Peptic Ulcer can cause stomach pain, nausea, vomiting, or early fullness. Low mood, anxiety, conflict, poor sleep, school pressure, or concerns about body shape can change eating. A teenager may hide symptoms or eat away from home, so a calm, private conversation can reveal useful detail. Appetite loss is not proof of any single condition.

Use a non-judgmental tone and ask what eating feels like, whether pain or nausea is present, and how mood and stress have been. Offer regular meals and snacks without criticism, keep appealing options available, and encourage fluids. Avoid comments about weight or appearance. Record changes in energy, sleep, exercise, vomiting, bowel habits, medicines, and menstrual pattern when relevant. Arrange a clinician visit if the change lasts, affects daily life, or causes concern about nutrition or eating behaviour.

Seek urgent help for fainting, confusion, severe weakness, breathing difficulty, severe abdominal pain, repeated vomiting, blood in vomit or stool, or thoughts of self-harm. Arrange prompt assessment for rapid physical change, persistent fever, yellow skin or eyes, dehydration, deliberate food restriction, secretive eating, or distress about body shape. Pancreatic Cancer can cause appetite loss, but a teenager’s symptom pattern needs individual assessment rather than assumptions.

Ask what medical, emotional, or medicine-related causes fit the symptoms, whether nutrition or mental-health support is needed, how to involve the teenager privately, and which changes require urgent review.