Clear Nipple Discharge in Adolescent Males: Pre-ejaculate, Not a Concern

Clear fluid from the nipple in teenage boys is not pre-ejaculate. Pre-ejaculate is emitted from the penis, not the nipple. The description confuses two different anatomical structures.

Actual Causes of Nipple Discharge in Males

• Physiologic (pubertal gynecomastia): Transient hormonal fluctuation (estrogen > testosterone) → breast bud tenderness, occasional clear/milky discharge. Resolves in 6–18 months. Affects 50–60% of adolescent males.
• Medications: Spironolactone, risperidone, PPIs, anabolic steroids, marijuana.
• Endocrine: Hyperprolactinemia (prolactinoma, thyroid), hypothyroidism, testosterone deficiency.
• Pathologic: Intraductal papilloma, duct ectasia, breast cancer (rare in males).
• Mechanical: Friction (runner's nipple), trauma.

Evaluation

• History: medications, substances, pubertal stage, other symptoms.
• Exam: breast tissue, lymph nodes, testicular size, visual fields.
• Labs: Prolactin, TSH, free T4, testosterone, LH, FSH, β-hCG (if testicular mass).
• Imaging: Ultrasound ± mammography if mass/suspicious discharge (bloody, unilateral, spontaneous, >1 duct).

Reassurance

Clear, bilateral, self-limited discharge during puberty is usually benign gynecomastia-related. Unilateral, bloody, spontaneous, or persistent discharge requires investigation.

Correction: The original content incorrectly identified nipple discharge as pre-ejaculate. Pre-ejaculate is a penile secretion (Cowper's glands) that lubricates the urethra and may contain sperm.