Children always have headaches and vomiting, the possible causes are: gastrointestinal cold, migraine, brain tumor and so on. 1. Gastrointestinal cold: mainly due to infection by bacteria, viruses and other pathogenic bacteria. Usually, patients can have headache, fever, runny nose, nasal congestion and other symptoms, and the pathogenic bacteria can enter the gastrointestinal tract through the respiratory tract, which can cause infection to the gastrointestinal tract, resulting in vomiting, abdominal distension, abdominal pain and other manifestations. 2. Migraine: this disease is hereditary, if the child suffers from migraine and does not do a good job of daily maintenance, it is easy to cause migraine recurrence, and then produce frequent headaches, vomiting, nausea, photophobia and other symptoms. 3. Brain tumor: when compressed by the tumor stimulation, it is easy to cause the patient’s intracranial pressure increases, which leads to the patient’s frequent headache performance, and the headache symptoms are more intense, and will also be accompanied by projectile vomiting. As you can see, children always have headaches, vomiting, it is recommended to go to the regular hospital in a timely manner to avoid aggravation of the condition.