Quick Answer

Syphilis is a bacterial infection that occurs in stages, and its consequences depend on how long it goes untreated. Early stages can clear with penicillin, but untreated infection can persist for years and damage the heart, blood vessels, brain, eyes, and nerves, and can be passed to a baby during pregnancy. Most of this damage is preventable with timely testing and treatment.

  • Syphilis is caused by the bacterium Treponema pallidum and is classified in four stages.
  • Primary syphilis usually shows as a single painless sore that heals on its own.
  • Secondary syphilis can cause a rash, fever, and swollen lymph nodes.
  • Latent syphilis has no symptoms, but the bacteria remain in the body.
  • Tertiary syphilis, now uncommon, can damage the heart, brain, and nerves years later.
  • Congenital syphilis occurs when the infection passes to a baby during pregnancy.

Context Most Pages Skip

Staging is not just medical shorthand - it is how clinicians predict what syphilis will do next. Treponema pallidum enters through mucous membranes or small breaks in the skin, multiplies at the site, then spreads through the bloodstream and lymphatics. The immune response clears the visible signs, but the bacteria can survive in tissue, which is why symptoms disappearing is not the same as being cured. The label latent describes infection that is still present without signs, and tertiary describes the slow, destructive phase that can appear years or decades later. Consequences, in other words, track the stage and the length of time untreated.

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⚕️ This page is educational and does not replace advice from a licensed clinician. If you may have been exposed to an STI, get tested — most infections are manageable, and many are fully curable.

Sources & Further Reading

Figures reflect CDC surveillance and WHO estimates; they are population statistics, not personal risk predictions.