Low blood pressure in 8-year-old girls may be related to malnutrition, endocrine metabolic factors, or may be caused by physiological factors. 1. Malnutrition: If an 8-year-old girl has a partial diet or insufficient nutritional intake, it may lead to malnutrition or iron-deficiency anemia, resulting in low blood pressure. 2. Endocrine metabolic factors: If the girl has hypothyroidism or adrenal insufficiency, she may also have low blood pressure. 3. Physiological factors: Physical condition and heredity can also lead to low blood pressure in 8-year-old girls, usually without obvious discomfort. There may be other reasons for the 8-year-old girl’s low blood pressure, and it is recommended to go to the hospital in time for the relevant examination, to clarify the cause of the disease and then actively treat the symptoms.