Syphilis Symptoms and Stages: A Complete Guide

Primary & Secondary Syphilis

The painless chancre, the spreading rash on palms and soles, and why syphilis is called the great imitator.

Neurosyphilis & Tertiary Syphilis

Brain, spinal cord, aorta, and gumma involvement in the devastating late stages.

Diagnosis: Serologic Tests

RPR, VDRL, FTA-ABS, and TPPA explained — how syphilis is confirmed at each stage.

Syphilis progresses through four distinct clinical stages — primary, secondary, latent, and tertiary — separated by periods of apparent resolution. This progression is deceptive: the infection does not clear on its own. Each stage looks completely different, which is why syphilis earned the nickname "the great imitator" and why it goes undiagnosed far more often than it should. This guide explains each stage in plain language so you know what to watch for and when to get tested.

Table of Contents

  1. Overview of the Four Stages
  2. Primary Syphilis: The Chancre
  3. Secondary Syphilis: Rash and Systemic Spread
  4. Condylomata Lata and Mucous Patches
  5. Latent Syphilis: Silent Infection
  6. Tertiary and Late Syphilis
  7. Neurosyphilis: When Syphilis Reaches the Brain
  8. Who Is at Risk
  9. When to Get Tested
  10. Key Research Papers
  11. Featured Videos

1. Overview of the Four Stages

Syphilis does not follow the typical pattern of most infections, where you get sick, your immune system fights it, and you either recover or get worse in a continuous trajectory. Instead, it progresses in stages with periods of apparent quiet in between. Each stage has distinct symptoms, distinct infectiousness, and distinct risks.

The most important thing to understand is that syphilis does not go away on its own. Each stage of apparent resolution is the bacteria going into hiding, not being eliminated. Without treatment, the infection continues silently and can cause permanent organ damage.

2. Primary Syphilis: The Chancre

Primary syphilis begins when Treponema pallidum enters the body through a break in the skin or mucous membrane during sexual contact. The defining sign is the chancre — a single, painless ulcer that appears at the exact site where the bacteria entered the body.

The chancre typically appears 10 to 90 days after exposure, with an average incubation period of 21 days. It starts as a small red bump, then erodes to form an ulcer with raised, firm (indurated) edges and a clean base. Despite looking significant, it causes no pain — which is the key feature that makes it so easily missed. A painful genital ulcer is more likely to be herpes or chancroid.

Where chancres appear:

Nearby lymph nodes (in the groin, neck, or armpit, depending on chancre location) enlarge and become firm, but typically not tender. The chancre heals completely on its own within three to six weeks, leaving no scar in most cases. This spontaneous healing is one of the most dangerous features of syphilis: patients often conclude the problem has resolved and do not seek medical care.

3. Secondary Syphilis: Rash and Systemic Spread

Secondary syphilis begins approximately two to eight weeks after the chancre first appears, while the primary sore is still present in some cases, or after it has healed in others. By this stage, T. pallidum has spread through the bloodstream to seed tissues throughout the entire body. Secondary syphilis is the most florid and most infectious stage.

The hallmark of secondary syphilis is a rash with a characteristic distribution: it appears on the palms of the hands and the soles of the feet. This location is unusual for most skin conditions and should immediately prompt consideration of syphilis. The rash is typically:

Beyond the rash, secondary syphilis can affect almost any organ system, which is why it can look like dozens of other conditions:

Like primary syphilis, secondary syphilis resolves on its own without treatment, usually within three to twelve weeks. The resolution of symptoms does not mean the infection is gone.

4. Condylomata Lata and Mucous Patches

Two specific manifestations of secondary syphilis deserve particular attention because they are both highly infectious and often overlooked.

Condylomata lata are flat, moist, gray-white or pinkish lesions that develop in warm, moist skin folds: the perianal area, genitals, inner thighs, axillae (armpits), under the breasts, and between the toes. They are teeming with live spirochetes and are among the most contagious manifestations of the entire infection. They look somewhat similar to genital warts caused by HPV (condylomata acuminata), but they are flat rather than raised and cauliflower-shaped. Touching them and then touching mucous membranes is a route of transmission.

Mucous patches are shallow, painless gray erosions on the mucous membranes of the mouth, tongue, palate, throat, or genitals. Like condylomata lata, they contain high concentrations of live bacteria. Oral mucous patches mean that kissing and oral contact can transmit syphilis during this stage.

The practical implication: a person with untreated secondary syphilis is highly contagious through sexual contact, oral contact, and direct skin-to-skin contact with active lesions, even before they may know they have syphilis.

5. Latent Syphilis: Silent Infection

After secondary syphilis resolves, the infection enters the latent stage — a period of complete silence during which there are no symptoms at all. The only evidence of infection is a positive blood test. This period can last years or even decades.

The latent stage is divided based on timing:

Many people remain in the latent stage permanently without ever developing tertiary disease, especially those who receive even partial antibiotic exposure. But the infection is not gone, and without treatment, one in three people will eventually progress to tertiary syphilis over years to decades.

This stage is why routine STI screening matters so much. You can have syphilis, be completely asymptomatic, and not know it. A simple blood test reveals it.

6. Tertiary and Late Syphilis

Tertiary syphilis develops in approximately one third of people with untreated latent infection, typically after 10 to 30 years. It represents the most destructive phase of the disease, causing irreversible damage to the heart, great vessels, brain, spinal cord, and other organs. Three overlapping patterns occur:

Gummatous syphilis involves the formation of gummas — soft, rubbery nodules of inflammatory tissue that can form anywhere in the body: skin, bones, liver, testis, brain. Gummas are locally destructive, eroding bone and soft tissue, but they respond well to antibiotic treatment even at this late stage. They are now rare in countries with good healthcare access.

Cardiovascular syphilis centers on the aorta. Spirochetes infect the vasa vasorum (the tiny blood vessels that nourish the aortic wall), causing inflammation (syphilitic aortitis) that weakens the wall. The consequences include aortic aneurysm (particularly of the ascending aorta), aortic valve regurgitation from root dilatation, and narrowing of the coronary artery openings at the aortic root. Before the antibiotic era, syphilitic aortitis was one of the most common causes of aortic aneurysm. Treatment cannot reverse established structural damage but can halt progression.

Neurosyphilis — discussed in more detail in its own section — encompasses all the ways syphilis damages the nervous system: meningitis, stroke in young people, personality change, dementia, psychosis, and the characteristic gait disturbance of tabes dorsalis.

7. Neurosyphilis: When Syphilis Reaches the Brain

Spirochetes can invade the nervous system at any stage of syphilis, not only in the tertiary phase. Early neurosyphilis (occurring during primary or secondary syphilis) typically presents as meningitis or cranial nerve palsies. Late neurosyphilis, developing after years of untreated infection, takes more severe and often irreversible forms.

Meningovascular neurosyphilis involves inflammation of the blood vessels supplying the brain and spinal cord. The resulting strokes can occur in people in their 30s or 40s — an age when strokes are otherwise rare — and may be the first indication that a person has syphilis.

General paresis of the insane (GPI) is a dementia caused by direct invasion and destruction of brain tissue by spirochetes. It develops 10 to 25 years after initial infection, producing personality changes, grandiose delusions, psychosis, loss of impulse control, and progressive cognitive decline. Before penicillin, this condition filled a substantial portion of psychiatric hospital beds.

Tabes dorsalis results from degeneration of the posterior columns and posterior nerve roots of the spinal cord. The result is a characteristic "stamping gait" (the person slaps their feet down hard because they cannot feel the ground), lancinating pains shooting through the legs, loss of bladder control, and Argyll Robertson pupils — small, irregular pupils that accommodate (constrict for near vision) but do not react to light.

Neurosyphilis in people with HIV infection deserves special mention: HIV coinfection accelerates the progression to neurologic disease and makes it more severe. Anyone with syphilis and HIV should have a lower threshold for lumbar puncture to check for neurosyphilis.

8. Who Is at Risk

Syphilis is transmitted almost exclusively through direct sexual contact with an active syphilitic lesion. Anyone who is sexually active can acquire syphilis, but rates are substantially higher in specific groups:

9. When to Get Tested

The CDC recommends syphilis testing for:

Testing is a simple blood draw. Results are usually available within a few days. Early treatment at any stage cures the infection and prevents progression — a single penicillin injection for early-stage disease. There is no reason to delay testing if you think you may have been exposed.

Key Research Papers

  1. Workowski KA, Bachmann LH, Chan PA, et al. Sexually transmitted infections treatment guidelines, 2021. MMWR Recomm Rep. 2021;70(4):1–187. PMID 34292926
  2. Hook EW 3rd. Syphilis. Lancet. 2017;389(10078):1550–1557. PMID 28065528
  3. Peeling RW, Mabey D, Kamb ML, et al. Syphilis. Nat Rev Dis Primers. 2017;3:17073. PMID 29022569
  4. Ghanem KG, Ram S, Rice PA. The modern epidemic of syphilis. N Engl J Med. 2020;382(9):845–854. PMID 32101666
  5. Janier M, Unemo M, Dupin N, et al. 2020 European guideline on the management of syphilis. J Eur Acad Dermatol Venereol. 2021;35(3):574–588. PMID 33094521
  6. Stamm LV. Syphilis: antibiotic treatment and resistance. Epidemiol Infect. 2015;143(8):1567–1574. PMID 25358466
  7. Ratnam S. The laboratory diagnosis of syphilis. Can J Infect Dis Med Microbiol. 2005;16(1):45–51. PMID 18159528
  8. CDC. Sexually transmitted disease surveillance 2022. US Dept of Health and Human Services. 2023. PMID 37791576
  9. Rolfs RT, Joesoef MR, Hendershot EF, et al. A randomized trial of enhanced therapy for early syphilis in patients with and without human immunodeficiency virus infection. N Engl J Med. 1997;337(5):307–314. PMID 9235493
  10. Tucker JD, Cohen MS. China's syphilis epidemic: epidemiology, proximate determinants of spread, and control responses. Curr Opin Infect Dis. 2011;24(1):50–55. PMID 21076295

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