Quick Answer

Syphilis is not hereditary in the genetic sense - it is an infection caused by the bacterium Treponema pallidum, and it is not passed through DNA. However, a pregnant person with syphilis can pass the infection to the fetus during pregnancy or delivery, which is called congenital syphilis. Timely testing and treatment with penicillin during pregnancy greatly reduce that risk.

  • Syphilis is caused by the bacterium Treponema pallidum, not by inherited genes.
  • Congenital syphilis means the infection was passed during pregnancy or birth.
  • A pregnant person can transmit syphilis at any stage, but early stages are more infectious.
  • Testing all pregnant people for syphilis is standard because treatment prevents most cases.
  • Penicillin is the recommended treatment for syphilis during pregnancy and for congenital syphilis.
  • Congenital syphilis can cause miscarriage, stillbirth, premature birth, or lifelong health problems.

Context Most Pages Skip

The word 'hereditary' suggests a trait coded in genes and passed from parent to child. Syphilis does not work that way. It is an infectious disease, and the bacterium that causes it can move from a pregnant person's bloodstream across the placenta or, less commonly, infect the baby during delivery. That route is vertical transmission, not inheritance. Older medical texts sometimes used 'hereditary syphilis' for what we now call congenital syphilis, which is why the question still comes up. The distinction matters: congenital syphilis is preventable with early detection and treatment, and it is not a reflection of a family's genetics.

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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.