Syphilis: Stages, Symptoms, and Why Early Treatment Is Critical

Syphilis is a sexually transmitted infection caused by the bacterium Treponema pallidum. It progresses through distinct stages, each with different manifestations, and can affect multiple organ systems if untreated.

Primary Syphilis

A painless chancre (sore) appears at the infection site—genitals, rectum, or mouth—typically 3 weeks post-exposure. It heals in 3–6 weeks, often unnoticed.

Secondary Syphilis

Weeks to months later: widespread rash (often on palms/soles), fever, swollen lymph nodes, sore throat, headaches, fatigue. Symptoms may resolve spontaneously, but infection persists.

Latent Syphilis

No visible symptoms; can last years. The infection remains transmissible, especially early in this stage.

Tertiary Syphilis

Years to decades later: severe damage to cardiovascular system (aortic aneurysm), nervous system (stroke, dementia, seizures), skin, bones, eyes, and liver.

Why Early Diagnosis Matters

Penicillin (or alternative antibiotics for allergic patients) is highly effective, especially in early stages. Prompt treatment halts progression and prevents irreversible complications. If you suspect exposure, seek testing immediately.