Lobular hyperplasia is most common in young and middle-aged women and is mainly due to an imbalance or abnormal secretion rhythm of estrogen and progesterone in the body. Lobular hyperplasia often manifests as thickening of the breast tissue, sometimes accompanied by pain, which may radiate to the armpits and shoulders. These symptoms are usually more pronounced before menstruation and reduce or disappear after the onset of menstruation. The vast majority of lobular hyperplasia is not cancerous and does not require special treatment. If breast pain affects daily life, medication can be taken to reduce the symptoms. There are very few cases of lobular hyperplasia with atypical hyperplasia of the ductal epithelium, and these patients have the possibility of cancer. Therefore, women with lobular hyperplasia should have regular checkups at the hospital. Doctors will perform biopsies and pathological slides on suspicious patients to clarify the diagnosis.