GPAtlas🧭 When to suspect
Precocious puberty is the onset of secondary sexual characteristics before age 8 in girls or before age 9 in boys. It is driven either by premature activation of the hypothalamic–pituitary–gonadal (HPG) axis – central, or gonadotrophin-dependent precocious puberty (GDPP) – or by sex-steroid production independent of that axis – peripheral, or gonadotrophin-independent precocious puberty (GIPP).
The first signs to look for are breast development (thelarche) in girls, often with accelerating growth, and testicular enlargement (≥ 4 ml) in boys. In girls most cases are idiopathic central precocious puberty and benign; in boys it is far rarer but proportionally much more likely to have a serious underlying cause, such as a central nervous system (CNS) lesion.
The primary-care task is twofold: distinguish the common benign normal variants from true, progressive precocious puberty, and refer promptly – urgently for any boy or any red-flag feature. Recognition and referral are the GP role; blood tests and imaging are not needed before referral.
| Pattern | Typical features | Action |
|---|---|---|
| Premature thelarche | Isolated breast development, usually before age 2–3, non-progressive, no growth acceleration or other pubertal signs. | Usually benign; refer if progressive, later onset, or other signs appear. |
| Premature adrenarche | Isolated pubic ± axillary hair, body odour, mild acne; no breast or testicular development. | Usually benign; refer if rapidly progressive or virilising. |
| Premature menarche | Isolated cyclical vaginal bleeding without other pubertal signs (uncommon). | Refer; exclude other causes of bleeding (trauma, foreign body, infection, abuse). |
| True (progressive) precocious puberty | Multiple signs advancing together over 4–6 months with accelerating height velocity and crossing of centiles. | Refer for specialist assessment – urgently if a boy or red flags. |
Source: BMJ · Endocrine Society CPP guideline
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