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Syphilis is a sexually transmitted infection (STI) caused by the bacterium Treponema pallidum. If it's not treated by a doctor, it can get worse over time and cause serious health problems.
The infection can be active at times and not active at other times. When the infection is active, you have symptoms. When it's not active, you don't have symptoms, even though you still have syphilis. But even when you don't have symptoms, you can pass syphilis to others.
You don't have to have sexual intercourse to get syphilis. Just being in close contact with an infected person's genitals, mouth, or rectum is enough to expose you to the infection.
Bacteria cause syphilis. They usually enter the body through the tissues that line the throat, nose, rectum, and vagina. Syphilis bacteria also can be transmitted by contact with the penis or vulva. A person with syphilis who has a sore or a rash can pass the infection to others. An infected pregnant woman can also pass syphilis to her baby.
Some things increase your chance of getting syphilis. They include:
You may not notice symptoms of syphilis. Sometimes they are the same as symptoms for other infections. This can cause someone with the infection to put off seeing a doctor. And it can make it harder for a doctor to tell if you have syphilis.
The four stages of syphilis have different symptoms.
If you have sores, bumps, a rash, blisters, or warts on or around your genital or anal area, or if you think you were exposed to an STI, see your doctor.
He or she will do a physical examination and will ask you about your symptoms and your sexual history. You will probably have one or more blood tests to check for the infection. Because the open sores from syphilis make HIV infection more likely, you may also be tested for HIV.
To prevent babies from getting syphilis, experts recommend that all pregnant women have a syphilis blood test.
Syphilis can be cured with antibiotics. Both you and any sex partners that you may have exposed to the infection will need to be treated.
It is important to know that syphilis is not a infection that you can treat on your own. It must be treated with medicine that only your doctor can give you. With treatment, you avoid other serious health problems. And treatment keeps you from spreading syphilis to others.
If a woman is pregnant and has untreated syphilis, it can cause miscarriage or stillbirth. It can also cause the baby to be born with the infection. This is called congenital syphilis.
At any stage of the infection, antibiotics work well to cure syphilis. They can't undo the damage already caused by late-stage syphilis. But they can help you avoid further problems from the infection.
There are some things you can do to lower your risk for getting syphilis. Whether you have never had the infection or if you have had it before and are trying to keep from getting it again, it is important to practice safer sex. Safer sex includes using condoms and using them correctly.
Syphilis is caused by the bacterium Treponema pallidum.
Transmission of the bacteria usually occurs during vaginal, anal, or oral sex. The syphilis bacteria are passed from person to person through direct contact with:
Sores mainly occur on the external genitals, vagina, anus, or rectum. Sores can also occur on the lips and in or around the mouth. The bacteria most commonly enter the body through mucous membranes, usually in the area around the genitals and urinary system.
In rare cases, syphilis enters the body through openings in the skin, such as cuts and scrapes, or even through wet kisses, if the infected person has a sore on the mouth or lips. Syphilis may also be transmitted by using a needle previously used by an infected person. Syphilis can be transmitted through a blood transfusion. But this is very rare, because all donated blood in Canada and the United States is screened for some sexually transmitted infections (STIs). And syphilis bacteria cannot survive more than 24 to 48 hours in blood stored using modern blood-banking methods.
A pregnant woman with syphilis can pass the infection through the placenta and infect her baby any time during pregnancy or delivery (congenital syphilis).
Syphilis cannot be spread through casual contact with toilet seats, door knobs, swimming pools, hot tubs, bathtubs, shared clothing, or eating utensils.
Having been infected with syphilis in the past does not protect a person from becoming infected again.
An incubation period is the time between exposure to a disease and the first symptom. A skin sore called a chancre is usually the first symptom of sexually transmitted syphilis. A chancre appears between 3 weeks to 3 months after a person has been infected with syphilis.
A person with syphilis can easily pass the infection (is contagious) to physically intimate partners when primary- or secondary-stage sores are present. But the person may be contagious for years, off and on, and is always contagious whenever an open sore or skin rash from syphilis is present.
Syphilis develops in four stages, each with a different set of symptoms.
During the primary stage of syphilis, a sore ( chancre) that is usually painless develops at the site where the bacteria entered the body. This commonly occurs within 3 weeks of exposure but can range from 10 to 90 days. A person is highly contagious during the primary stage.
Secondary syphilis is characterized by a rash that appears 2 to 12 weeks after the chancre develops and sometimes before it heals. Other symptoms may also occur, which means that the infection has spread throughout the body. A person is highly contagious during the secondary stage.
A rash often develops over the body and commonly includes the palms of the hands and the soles of the feet.
The skin rash usually heals within 2 months on its own without scarring. After healing, skin discoloration may occur. But even though the skin rash has healed, syphilis is still present and a person can still pass the infection to others.
When syphilis has spread throughout the body, the person may have:
If untreated, an infected person will progress to the latent (hidden) stage of syphilis. The latent stage is defined as the year after a person becomes infected. After the secondary-stage rash goes away, the person will not have any symptoms for a time (latent period). The latent period may be as brief as 1 year or range from 5 to 20 years.
Often during this stage, an accurate diagnosis can only be made through blood testing, the person's history, or the birth of a child with congenital syphilis.
A person is contagious during the early part of the latent stage and may be contagious during the latent period when no symptoms are present.
Some people with syphilis have a relapse of the infection during its latent stage. A relapse means the person was symptom-free but then started having symptoms again. Relapses can occur several times.
When relapses no longer occur, a person is not contagious through contact. But a woman in the latent stage of syphilis may still pass the infection to her developing baby and may have a miscarriage or a stillbirth or give birth to a baby infected with congenital syphilis.
This is the most destructive stage of syphilis. If untreated, the tertiary stage may begin as early as 1 year after infection or at any time during a person's lifetime. A person with syphilis may never experience this stage of the illness.
During this stage, syphilis may cause serious blood vessel and heart problems, mental disorders, blindness, nerve system problems, and even death. The symptoms of tertiary (late) syphilis depend on the complications that develop. Complications of this stage include:
Congenital syphilis refers to syphilis passed from a mother to her baby during pregnancy or during labour and delivery. The Public Health Agency of Canada (PHAC) strongly recommends that all pregnant women be screened for syphilis because of the severe consequences of being pregnant while infected or having a child born with congenital syphilis. Screening should be done:footnote 1
Congenital syphilis increases the risk of fetal death and medical complications in newborns. Syphilis enters the fetal blood system through the placenta, causing infection in the newborn or death of the fetus. Symptoms of congenital syphilis include:
Because there are other conditions with similar symptoms, an accurate diagnosis is important for treatment.
About 3 weeks—although the range is from 10 to 90 days—after a person is infected with syphilis, a sore (chancre) that is usually painless often appears on the genitals. This first stage in the course of syphilis is referred to as the primary stage. The chancre usually heals without treatment in 3 to 6 weeks.
If syphilis is not treated during the primary stage, it often progresses to later stages.
In the secondary stage of syphilis, a skin rash will usually develop about 2 to 12 weeks after the chancre appears. The symptoms usually disappear without treatment within 2 months.
After the rash clears, a person may have a period with no symptoms. This symptom-free period is called the latent (hidden) stage. Even though symptoms disappear, the bacteria that cause syphilis remain in the body and begin to damage the internal organs. The latent period may be as brief as 1 year or range from 5 to 20 years.
A person is contagious during the primary and secondary stages and may still be contagious during the early part of the latent stage. During this time, symptoms of the second stage of syphilis may reappear. This is called a relapse and can occur several times.
If not detected and treated, syphilis may then progress to the tertiary (late) stage, the most destructive stage of syphilis. During this stage, syphilis may cause serious blood vessel and heart problems, mental disorders, blindness, nerve system problems, and even death. It may begin as early as 1 year after infection or at any time during the infected person's life. About one-third of untreated people who are infected with syphilis will have the complications of tertiary (late) syphilis. Any organ system (such as the central nervous system) may become involved.
Complications of tertiary (late) syphilis include:
Congenital syphilis refers to syphilis passed from the mother to the baby during pregnancy or during labour and delivery. Congenital syphilis can cause complications in newborns and children.
Your risk of syphilis increases if you:
Syphilis is contagious whenever an open sore or skin rash is present. The risk of being infected with syphilis from a single sexual encounter with an infected partner is approximately 3% to 10%.footnote 2
Infection with syphilis also increases a person's risk of being infected with HIV. Syphilis causes open sores on the genitals that allow the HIV infection to enter the body easily. Syphilis is in general more common in people who are also infected with HIV.
Call to make an appointment if you:
Do not have sexual intercourse or other sexual contact until you have been treated by a doctor. If you are diagnosed with syphilis, your sex partner(s) will need to be treated also.
In most areas, public health units or sexual health clinics are able to diagnose and provide assessment and treatment of early syphilis and other STIs.
Watchful waiting is a wait-and-see approach. It's not a good choice if you think you were exposed to or have syphilis or another STI. Any symptoms or other changes that suggest syphilis or another STI should be checked by a doctor.
Diagnosis of syphilis includes a medical history and a physical examination. Your doctor may ask you questions such as:
The physical examination may include:
The diagnosis of syphilis is usually confirmed with one of several blood tests. This is especially true if no sores are present. If sores are present, a doctor may look at the fluid from one of the sores with a microscope to see whether syphilis bacteria are present (dark-field examination).
In the diagnosis of the primary and secondary stages of syphilis, lumbar puncture (spinal tap) is needed in some cases.
Additional testing should be done to find out if other sexually transmitted infections are present, especially:
The diagnosis of syphilis can be delayed or complicated because its symptoms are very similar to those of many other diseases and are sometimes not recognized. Syphilis has historically been called "the great imitator."
Screening for syphilis is strongly recommended for pregnant women and for people who are at increased risk for the infection.
People at high risk of contracting syphilis include those who:
The Public Health Agency of Canada (PHAC) strongly recommends that pregnant women be screened for syphilis because of the severe consequences of being pregnant while infected or having a child born with congenital syphilis. Screening should be done:footnote 1
Prompt treatment of syphilis is needed to cure the infection, prevent complications, and prevent the spread of the infection to others.
Penicillin is the preferred drug for treating syphilis. Penicillin is the standard therapy for the treatment of neurosyphilis, congenital syphilis, or syphilis acquired or detected during pregnancy. If you are allergic to penicillin, make sure you tell your doctor. Your doctor will still be able to treat the syphilis but may consult with a specialist on the best antibiotic choice.
Self-care can lower your risk for an initial infection of or reinfection with syphilis or other sexually transmitted infections (STIs).
The treatment of syphilis and other sexually transmitted infections (STIs) is complex. If taken properly, antibiotic treatment with penicillin will usually cure a syphilis infection. If syphilis has progressed to the tertiary stage, antibiotics can prevent further complications. But they cannot reverse damage that has already occurred. Prompt antibiotic treatment will decrease complications and prevent the spread of the infection.
Exposed sex partners should be treated for syphilis. The chancres in syphilis can make transmission of HIV more likely. So testing for both syphilis and HIV should be done.
In rare cases, the first attempt at treatment does not cure the syphilis infection. Follow-up blood tests are needed to be sure the infection is cured.
Some types of syphilis can't be treated by (are resistant to) certain antibiotics. If your doctor finds that your syphilis is resistant to the drug you are taking, you will be tested so that your doctor can prescribe another antibiotic to cure the infection.
CitationsPublic Health Agency of Canada (2006, updated 2010). Syphilis. In Canadian Guidelines on Sexually Transmitted Infections. Available online: http://www.phac-aspc.gc.ca/std-mts/sti-its/guide-lignesdir-eng.php.Eckert LO, Lentz GM (2012). Infections of the lower and upper genital tracts: Vulva, vagina, cervix, toxic shock syndromes, endometriosis, and salpingitis. In GM Lentz et al., eds., Comprehensive Gynecology, 6th ed., pp. 519–559. Philadelphia: Mosby.Other Works ConsultedAmerican Academy of Pediatrics (2015). Syphilis. In DW Kimberlin et al., eds., Red Book: 2015 Report of the Committee on Infectious Diseases, 30th ed., pp. 755–768. Elk Grove Village, IL: American Academy of Pediatrics.Cox D, Ballard RC (2010). Syphilis. In SA Morse et al., eds., Atlas of Sexually Transmitted Diseases and AIDS, 4th ed., pp. 111–140. Philadelphia: Saunders.
Current as of: February 11, 2021
Author: Healthwise StaffMedical Review: Kathleen Romito MD - Family MedicineThomas M. Bailey MD - Family MedicineE. Gregory Thompson MD - Internal MedicineAdam Husney MD - Family MedicineMartin J. Gabica MD - Family MedicineKirtly Jones MD - Obstetrics and GynecologyKevin C. Kiley MD - Obstetrics and Gynecology
Current as of: February 11, 2021
Author: Healthwise Staff
Medical Review:Kathleen Romito MD - Family Medicine & Thomas M. Bailey MD - Family Medicine & E. Gregory Thompson MD - Internal Medicine & Adam Husney MD - Family Medicine & Martin J. Gabica MD - Family Medicine & Kirtly Jones MD - Obstetrics and Gynecology & Kevin C. Kiley MD - Obstetrics and Gynecology
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