Bilateral mammary lobular hyperplasia is a type of abnormal proliferative disease of the breast tissue. Patients with mammary hyperplasia primarily experience breast pain and have breast lumps, and it is a benign disease. This condition is caused by an imbalance in ovarian endocrine levels, changes in hormone levels in the body, and an increase in estrogen levels, leading to excessive proliferation and incomplete restoration of breast tissue. It is common in clinical practice to examine breast diseases when breast pain and lumps are present.