Glandular epithelium refers to epithelial tissues with secretory functions, and glandular epithelial lesions, i.e., pathological changes in such epithelial tissues, are a description of pathological findings. Glandular epithelium is widely distributed in the human body, usually found in body cavities or organs with cavities, and has the function of secreting mucus, digestive fluids, enzymes, hormones and other substances. Glandular epithelial lesions are pathological changes in the glandular epithelial tissue, which are commonly seen clinically: cervical glandular epithelial isoepithelial hyperplasia, squamous cell chemosis of respiratory mucosal epithelium, and hyperplastic epithelial lesions of the ductal epithelium of the mammary glands. For patients with adenoepithelial lesions, it is necessary to do timely pathologic examination to determine the benign or malignant lesions. If the lesion is malignant, it should be handled promptly to avoid delaying treatment and developing into malignant tumors and other adverse consequences.