“Venereal disease” is an older term that today covers what doctors call sexually transmitted infections, or STIs. The tricky part: many of these infections cause no symptoms at all. Up to 70% of women with chlamydia and at least 50% of women with gonorrhea never notice anything wrong. That makes knowing the full range of possible signs even more important, because catching an infection early prevents serious complications down the line.
The symptoms you experience depend entirely on which infection you have. Here’s what to look for with the most common ones.
Chlamydia Symptoms
Chlamydia is one of the most common STIs, and one of the quietest. About half of infected men and 70% of infected women have no symptoms whatsoever. When symptoms do appear, they often take several weeks after exposure to show up.
Women may notice abnormal vaginal discharge, a burning feeling when peeing, pain in the lower abdomen or lower back, bleeding between periods, or pain during sex. Men are more likely to notice discharge from the penis, burning during urination, or pain and swelling in one or both testicles. Rectal infections in either sex can cause rectal pain, discharge, and bleeding, though many rectal infections are silent too.
Gonorrhea Symptoms
Gonorrhea tends to show up faster than chlamydia. Most men who develop symptoms notice them within 2 to 5 days of infection, though it can take up to 30 days. Women who develop symptoms typically do so within 10 days.
The hallmark sign in men is a thick, cloudy, or bloody discharge from the penis along with burning urination. Swollen, painful testicles are possible but less common. Women may experience increased vaginal discharge, painful urination, heavy periods or bleeding between periods, and pelvic or abdominal pain. Like chlamydia, gonorrhea can infect the rectum (causing itching, soreness, discharge, and painful bowel movements) and the throat (usually causing a sore throat or no symptoms at all). Up to 40% of men and at least 50% of women with gonorrhea have no noticeable symptoms.
Syphilis Symptoms
Syphilis progresses through distinct stages, each with its own set of signs.
Primary Stage
The first sign is a sore, called a chancre, at the spot where the infection entered the body. That’s typically on or around the genitals, anus, rectum, or mouth. The sore is usually firm, round, and painless, which means many people don’t notice it or mistake it for something harmless. You might have one sore or several.
Secondary Stage
If untreated, syphilis moves to a secondary stage that can begin while the original sore is still healing or weeks after it’s gone. The signature symptom is a rash that often appears on the palms of the hands and the soles of the feet. It looks rough, red, or reddish-brown. Sores can also develop in the mouth, vagina, or anus. This stage can include fever, swollen lymph nodes, sore throat, patchy hair loss, headaches, weight loss, and fatigue.
Without treatment, syphilis can eventually progress to a late stage that damages the brain, nerves, heart, and other organs years after the initial infection.
Genital Herpes Symptoms
A first herpes outbreak is usually the worst. It often comes with flu-like symptoms: fever, headache, body aches, and swollen lymph nodes in the groin. The characteristic sign is a cluster of small bumps or blisters around the genitals, anus, or mouth. These blisters break open into painful ulcers that ooze or bleed, then slowly scab over and heal.
Before recurring outbreaks, many people feel warning signs called prodromal symptoms: tingling, shooting pain in the legs, hips, or buttocks, and genital pain. These warnings can start hours or days before new sores appear. Over time, recurrent outbreaks tend to become less frequent and less severe.
Genital Warts (HPV) Symptoms
Genital warts are caused by certain strains of the human papillomavirus. They appear as small, skin-colored bumps in the genital area, and when several cluster together they can take on a cauliflower-like shape. Warts can show up on the vulva, vaginal walls, cervix, penis shaft or tip, scrotum, anus, or the area between the genitals and anus. In some cases they grow inside the vagina or anal canal where you can’t easily see them.
Many warts are so small and flat they’re essentially invisible. Most people with HPV never develop visible warts at all, and the virus often clears on its own. The concern with HPV is that certain high-risk strains (different from the ones that cause warts) can lead to cervical and other cancers without producing any obvious symptoms.
Trichomoniasis Symptoms
Trichomoniasis is caused by a parasite rather than a bacterium or virus. Women tend to have more noticeable symptoms: a thin vaginal discharge that can be clear, white, yellowish, or greenish, often with a distinct fishy smell. Vaginal itching, burning, soreness, and pain during sex or urination are also common.
Men with trichomoniasis may notice discharge from the penis, itching or irritation inside the penis, or mild burning after urination or ejaculation. Many men have no symptoms and can unknowingly pass the infection to partners.
HIV Symptoms
The earliest stage of HIV infection typically develops 2 to 4 weeks after exposure and can look like a bad case of the flu: fever, headache, rash, body aches, and fatigue. These symptoms are easy to dismiss or attribute to a common virus. After this initial phase, HIV can remain silent for years while gradually weakening the immune system, which is why testing is the only reliable way to know your status.
Why Symptoms Alone Aren’t Reliable
The biggest challenge with STIs is that the absence of symptoms does not mean the absence of infection. Many of the most common infections, including chlamydia, gonorrhea, HPV, and early HIV, frequently produce no signs at all. Women are especially likely to carry infections without symptoms because many of these infections initially affect the cervix, which has few nerve endings that register pain or irritation.
Untreated bacterial infections like chlamydia and gonorrhea can spread to the uterus and fallopian tubes, causing pelvic inflammatory disease. PID sometimes has obvious symptoms like pelvic pain, fever, and abnormal discharge, but it can also be subtle, showing up as mild abdominal discomfort, pain during sex, or irregular bleeding. Left untreated, PID can lead to chronic pelvic pain, scarring of the reproductive organs, and difficulty getting pregnant.
Because so many infections are silent, routine screening based on your age and sexual activity is far more reliable than waiting for symptoms to appear. Most bacterial and parasitic STIs are fully curable with treatment, and viral infections like herpes and HIV are manageable with medication, especially when caught early.