Hyperthyroidism generally does not cause breast nodule enlargement, and there is no necessary relationship between the two. Hyperthyroidism, known as hyperthyroidism, is a syndrome caused by an increase in thyroid hormones in the blood circulation, which is mainly characterized by insomnia, increased heart rate, fear of heat, excessive sweating, scanty menstruation and other symptoms, and does not usually cause breast nodules to increase in size. Breast nodules may be related to breast infections, estrogen disorders, etc., which can be diagnosed by breast ultrasound and has nothing to do with thyroid hormones. Patients with hyperthyroidism should take medication on time, keep a relaxed mood, avoid overwork, and when combined with breast nodules, need regular review and surgery if necessary.