What Can Delay Puberty? Genetics, Nutrition, and Medical Factors

Puberty timing varies widely, but several factors can delay its onset:

• Genetics: Family history of late puberty (constitutional delay) is the most common cause.
• Nutritional deficiencies: Inadequate calories, protein, zinc, iron, vitamins A and D impair hormonal signaling.
• Chronic illness: Conditions like cancer, kidney disease, diabetes, cystic fibrosis, or inflammatory bowel disease.
• Hormonal imbalances: Hypothyroidism, hyperthyroidism, growth hormone deficiency, or gonadotropin-releasing hormone (GnRH) deficiency.
• Medications: Long-term corticosteroids, chemotherapy, radiation, or ADHD stimulants (in some cases).
• Excessive exercise/low body fat: Common in elite athletes, dancers, or those with eating disorders.
• Severe psychosocial stress: Chronic trauma, neglect, or high-conflict environments.

Evaluation by a pediatric endocrinologist is recommended if no pubertal signs by age 13 in girls (no breast development) or 14 in boys (no testicular enlargement). Most delays are benign, but identifying treatable causes is important.