Seios Doloridos no Início da Gravidez: A Conexão com o Hormônio hCG

Breast tenderness is often the earliest symptomatic sign of pregnancy, driven by hormonal cascades initiated by hCG.

Pathophysiology

1. hCG → Corpus luteum → Progesterone + Estradiol: hCG maintains luteal steroid output.
2. Estrogen: Stimulates ductal proliferation, branching, and vascularization.
3. Progesterone: Induces lobuloalveolar development, secretory differentiation.
4. hCG direct effect: hCG/LH receptors on breast tissue; may directly stimulate growth.
5. Prolactin rise: Pituitary prolactin increases (estrogen-stimulated); prepares for lactogenesis.

Clinical Features

• Onset: 3–4 weeks LMP (often before missed period).
• Quality: heaviness, tingling, hypersensitivity, aching.
• Asymmetry common; one breast may be more tender.
• Peaks first trimester; often improves by 12–14 weeks.

Management

• Supportive bra (sleep bra at night).
• Warm/cool compresses per preference.
• Avoid caffeine (methylxanthines may exacerbate).
• Acetaminophen if needed (safe in pregnancy).

Red Flags

• Unilateral mass, skin dimpling, nipple retraction, bloody discharge → imaging (US ± mammogram if >30).
• Signs of mastitis (erythema, warmth, fever) if lactating.

Breast tenderness = healthy hormonal response; absence doesn't indicate a problem.