Health conditions


  • Syphilis is a STI which can be very serious if left untreated.
  • Many people have mild or no symptoms that only last a few days.
  • Syphilis can be cured with antibiotics.

Syphilis is a very serious sexually transmissable infection (STI) that can affect your brain and other organs. It’s caused by the Treponema pallidum bacteria.

Syphilis is easy to cure if diagnosed early.

Syphilis can be very dangerous during pregnancy. If a pregnant woman has syphilis it can be transmitted to her baby and put its life at risk. Read more about syphilis in pregnancy.
How do you get syphilis?

Syphilis is passed from one person to another during sexual activity.

It is spread by unprotected vaginal, anal and oral sex.

It can also be spread through intimate or skin-to-skin contact with an infected person.

An infected mother can also pass syphilis on to her baby via the placenta during pregnancy, which is called congenital syphilis. Read more about syphilis in pregnancy.

What are the signs and symptoms?

The first signs of syphilis don’t last long, so you can have it and pass it on without knowing.

Sore or ulcer (chancre)

Some people get an ulcer or sore around the genital area or mouth, 3 to 12 weeks after infection.

The sore can be:

  • vary in size or shape
  • usually does not bleed
  • feels like a hard button on the skin
  • is painless (so you may not notice it).

If not treated, the sore heals and disappears after a few weeks – but you are still infected, and the bacteria are in the bloodstream and spreading around the body. This is called the primary stage of the disease.

Other symptoms

If syphilis is untreated, more symptoms may appear 2 to 6 months after getting infected. This is the secondary stage, which can last for 6 months or more.

Symptoms may include:

  • a skin rash (on the face, palms, and soles of the feet)
  • hair loss
  • swollen glands
  • fever
  • headaches
  • pain in bones, joints and muscles
  • lumps in your groin and around your anus (bum hole) or vulva.

Without treatment, there is a latent stage where there are no visible signs but you are still infectious.

The symptoms will go away but if syphilis is untreated it stays in your body and you can pass it on to other people through sex for up to 2 years. It can also make you very sick.

If you have untreated syphilis for over 2 years (called the tertiary stage), the disease can affect the brain, heart, large blood vessels, the spinal cord, skin and bones. This can lead to disability and death.

Syphilis in pregnancy

If a pregnant person has syphilis, it can be passed on to the baby and put its life at risk. This is called congenital syphilis.

If syphilis is found early in the pregnancy it can be treated, lessening damage to the baby.

Pregnant people should get tested for syphilis early and often throughout their pregnancy.

Read more about syphilis in pregnancy.

How do I know if I have syphilis?

Ask for a syphilis blood test

Your doctor will do a blood test for syphilis. However, for a short period just after syphilis enters the body, it can’t be picked up with a test. So if your result is negative, you will need to have the test again after 3 months.

It’s a good idea to get tested for other sexually transmitted infections (STIs) such as chlamydia, gonorrhoea and HIV at the same time.

Find a service where you can get a syphilis blood test at Get the Facts (external site). Search the for a location and select the 'Sexual Health / Pregnancy / Sexuality' option.

How is syphilis treated?

Treatment for syphilis

Syphilis is treated with penicillin or other antibiotics. You need to take the full course and attend all your appointments.

After treatment, you’ll need a blood test to make sure you are cured.

If left untreated

If you have syphilis for more than 2 years and are not treated, it can affect the:

  • brain
  • heart
  • large blood vessels
  • spinal cord
  • skin
  • bones.

This can lead to disability and death.

While you have the infection

Once diagnosis is confirmed, don’t have vaginal, anal or oral sex, even with a condom, until after you have completed the full course of treatment. Syphilis is very infectious, particularly during the primary and secondary stages.

Contact tracing

Your doctor should also talk to you about contact tracing.

If you test positive for syphilis, it is important to let your sexual partners know. This is to make sure syphilis does not impact their health and continue to spread. If your regular sexual partners do not get treated, you may get syphilis again.

Contact tracing involves finding and informing the contacts of a person with an infection so they can get counselling, testing and treatment if necessary. You can do the contact tracing yourself and/or with help of a health professional. Discuss this with your doctor. You can also use the Better To Know website (external site) to let your sexual partners know without using your name.

How can syphilis be prevented?
  • Have regular STI tests.
  • Always use condoms and/ or dams and water-based lube when having sex.
  • Talk to your sexual partners about sexual health.

Translated information about syphilis

Where to get help

  • See your doctor
  • call healthdrect on 1800 022 222
  • Call the Sexual Health Helpline
    • metropolitan callers: (08) 9227 6178
    • country callers: 1800 198 205
  • Visit Healthysexual (external site) for information and free online chlamydia and gonorrhoea testing (external site)
  • Contact your local sexual health clinic (external site)

Last reviewed: 04-12-2023

Public Health

This publication is provided for education and information purposes only. It is not a substitute for professional medical care. Information about a therapy, service, product or treatment does not imply endorsement and is not intended to replace advice from your healthcare professional. Readers should note that over time currency and completeness of the information may change. All users should seek advice from a qualified healthcare professional for a diagnosis and answers to their medical questions.

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