Dizziness in a nine-year-old boy may be caused by malnutrition, viral cold, encephalitis and other reasons. 1. Malnutrition: As nine-year-old boys are in a period of rapid growth and development, when patients suffer from malnutrition due to anorexia, picky eating, partiality, etc., it may cause the symptoms of dizziness. 2. Viral colds: viral colds are infectious diseases of the upper respiratory tract caused by viral infections, the main manifestations of which are nasal congestion, sneezing, runny nose, dry throat, sore throat, etc., and some of the patients are also accompanied by fever, malaise, limb aches and pains and other systemic symptoms, the dizziness of the nine-year-old boy may be caused by viral colds. 3. Encephalitis: Encephalitis is an infectious disease of the central nervous system, belonging to the acute inflammation of the brain parenchyma. It is often characterized by headache, fever, blurred consciousness, dizziness, nausea, vomiting and so on. Nine-year-old boy dizziness, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.