Lactation syndrome is a condition that occurs in women of childbearing age or pre-menopausal women and is caused by an imbalance in hormone secretion, especially estrogen and progesterone secretion. Also more common are pituitary tumors that cause abnormal secretion of the pituitary gonadal axis, which can also cause milk to appear in the breasts during non-lactating periods. Therefore, if there is a watery substance in the breast when pressed, it is best to go to a regular hospital for routine checkups, including mammography, mammogram, and MRI of the brain, to check for possible pituitary tumors, and not to treat them at home to avoid delaying the condition and making it worse.