Secretory adenomas are benign (non-cancerous) tumors that develop in the glandular tissue of the endocrine glands, such as the pituitary, thyroid, or adrenal glands. These tumors secrete excess amounts of hormones, which can lead to symptoms and complications depending on the specific hormone being overproduced. For example, a pituitary secretory adenoma that secretes prolactin can cause menstrual irregularities, infertility, and breast enlargement in women, while a thyroid secretory adenoma that secretes thyroid hormone can lead to hyperthyroidism and its associated symptoms.