What causes excessive sleepiness in children after hepatitis B?

A child may experience drowsiness after hepatitis B due to the following reasons: 1. Side effects: After receiving the hepatitis B vaccine, some children may develop side effects such as mild fever and drowsiness. This is a normal immune response that typically resolves on its own within 1–2 days and does not require special treatment. 2. Impact of the disease itself: Hepatitis B can cause liver inflammation and damage, which may subsequently affect brain function and lead to drowsiness. In such cases, prompt medical evaluation of liver function and appropriate treatment are necessary. 3. Malnutrition: Improper diet or poor gastrointestinal function during hepatitis B infection may result in malnutrition, leading to symptoms such as physical weakness, fatigue, and drowsiness. Parents should ensure the child's diet is nutritionally balanced and easy to digest.