Adolescence marks a crucial transition from childhood to sexual maturity, culminating in reproductive capability. It represents the final stage of childhood development and the second peak growth spurt. Characterized by rapid development of sexual organs and secondary sexual characteristics alongside accelerated physical growth, this phase is accompanied by corresponding psychological and behavioral changes.However, some boys experience breast development during puberty. What exactly causes this?
Chen Zhongyang, attending physician at the Breast Disease Center of Guangdong Provincial Maternal and Child Health Hospital, addressed this issue on the "Health 100,000 Whys" Q&A platform of Family Doctor Online.
Most cases of transient adolescent GYN require no treatment
Male breast development (GYN) is a clinical condition caused by hormonal imbalances resulting from various factors, leading to abnormal growth of male breast tissue and excessive proliferation of mammary connective tissue. It is the most common male breast disorder, accounting for approximately 70% to 90% of male breast diseases.Clinically, it often manifests as painless, progressive enlargement of one or both breasts, or the appearance of tender lumps in the areolar region.
Chen Zhongyang pointed out that the exact cause of adolescent male breast development remains unclear, though it is currently believed to be linked to heightened secretion of sex hormones during puberty. Additionally, increased aromatase activity in the breast tissue during adolescence leads to greater local estrogen production, resulting in breast hyperplasia.Some studies also suggest it may result from heightened sensitivity of mammary tissue to physiologically present free estrogen.
He emphasized that 50% of GYN cases are physiological, most commonly occurring in newborns and adolescents. Such GYN is typically transient, usually benign, and often requires no treatment. However, when occurring before adolescence, in young adults, or middle-aged men, it is generally considered abnormal and warrants further examination to rule out breast cancer or other neoplasms.
Intervention should be provided for transient GYN if it impacts the patient's psychological well-being.
Regarding treatment for male breast development, he stated that rational choices should be made based on the underlying cause, duration of symptoms, presence of accompanying symptoms, and breast size.First, treatment should target the underlying cause. Generally, most patients have identifiable triggers. For those with confirmed causes, breast enlargement typically resolves after addressing the primary condition. Drug-induced cases should discontinue the relevant medication, often leading to spontaneous recovery.
He also noted that while transient adolescent GYN typically requires no treatment beyond clinical observation, cases presenting with persistent breast pain, tenderness, or significant breast development that adversely affects physical appearance or psychological well-being warrant clinical intervention, such as medication or surgery.
Extension—The following conditions may cause male breast development:
1.Hyperthyroidism: Approximately 10% of male hyperthyroidism patients experience breast development, though the cause remains unclear. It may result from elevated thyroid hormones increasing plasma SHBG concentration, binding more testosterone, and thereby raising the free estrogen/androgen ratio. This condition typically resolves with antithyroid medication.Additionally, hyperthyroidism may impair Leydig cell function, further increasing the estrogen/androgen ratio.
2. Hypothyroidism: Hypothyroidism with gynecomastia may be associated with excessive prolactin (PRL) secretion and insufficient estrogen levels.
3. Chronic renal failure: Accumulation of toxic substances may suppress testicular function, reducing testosterone levels while simultaneously elevating pituitary gonadotropins and PRL levels;
4. Malnutrition: May lead to decreased androgen synthesis and inhibition of pituitary gonadotropin synthesis and secretion. This inhibitory effect resolves upon nutritional improvement.