We treated a 18 year-old female patient. The main symptoms were Low back pain, Dyspepsia, Anorexia. She want to check blood test spontaneously and we diagnosed her as subclinical hypothyroidism and prescribe herbal medicine three times a day. We observed clinical symptoms and Free T4, T3, TSH levels. After the treatment, The main symptom were improved and TSH levels fell. This case shows that herbal medicine has an effect on subclinical hypothyroidism.