Hi, There could be several potential causes for the symptoms your granddaughter is experiencing, and it s important to have her evaluated by a healthcare provider to determine the underlying cause. Some possibilities include: * Migraines: Headaches accompanied by nausea are common in migraines, and they can be triggered by various factors like stress, certain foods, and changes in sleep patterns. * Gastrointestinal disorders: Your granddaughter s symptoms of nausea and stomach discomfort after eating may be due to a gastrointestinal disorder, such as acid reflux, irritable bowel syndrome, or celiac disease. * Food intolerance or allergy: Nausea and other gastrointestinal symptoms after eating can also be a sign of food intolerance or allergy. It s possible that your granddaughter is sensitive to certain foods, such as dairy or gluten, and that her body is having a hard time digesting them. * Chronic fatigue syndrome: Chronic fatigue syndrome (CFS) is a condition that can cause extreme fatigue, headaches, and other symptoms. It is more common in older children and teenagers but can occur in younger children as well. * Anxiety or depression: Emotional issues such as anxiety or depression can also manifest as physical symptoms like headaches and nausea. It s important to have your granddaughter evaluated by a healthcare provider to determine the underlying cause of her symptoms and develop an appropriate treatment plan. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Priyanka, General & Family Physician