Chlamydia and gonorrhea can cause this symptom, and trichomoniasis may also produce urinary discomfort. Nevertheless, urinary tract infections, irritation from soaps or personal-care products, and other medical conditions can cause similar sensations.
The timing and accompanying symptoms can help guide a clinician's assessment, but they cannot establish a diagnosis by themselves. For example, burning during urination combined with genital discharge may raise concern about urethritis, which is inflammation of the urethra. Testing is needed to identify the cause.
Do not assume that drinking more water will resolve the problem. Although staying hydrated is generally helpful, it does not cure an STI. If symptoms persist, recur, or follow a possible exposure, arrange an assessment and ask whether STI testing is appropriate.
Seek urgent medical care if urinary discomfort is accompanied by severe pain, fever, inability to urinate, significant blood in the urine, or intense pain or swelling in the testicles or lower abdomen.
4. Itching, Irritation, or a Rash
Itching around the genitals or anus can be uncomfortable and may lead people to worry about an STI. Some infections can cause irritation, but itching is a particularly nonspecific symptom.
Genital herpes may cause itching or tingling before sores develop. Trichomoniasis can cause genital irritation, and certain infections affecting the skin may produce visible changes. Pubic lice and scabies can also cause itching in intimate areas and spread through close contact, including sexual contact.
At the same time, irritation may result from sweat, friction, shaving, tight clothing, fragranced soaps, laundry products, eczema, or yeast infections. Scratching can further inflame the skin and make the original problem harder to assess.
If itching is persistent, severe, or accompanied by sores, unusual discharge, swelling, or pain, seek medical advice. Avoid using strong disinfectants or perfumed products on sensitive skin. These products can worsen irritation rather than treat its cause.
A healthcare professional may examine the affected area and ask about recent products, symptoms, and possible exposures. Depending on the findings, they may recommend a swab, urine test, blood test, or another investigation.
5. Lower Abdominal Pain, Pelvic Discomfort, or Testicular Pain
Pain in the lower abdomen or pelvis can have many causes, including digestive problems, menstrual cramps, urinary conditions, and reproductive health issues. In some cases, it may indicate a complication of an untreated STI.
In people with a uterus, chlamydia or gonorrhea can sometimes lead to pelvic inflammatory disease (PID), an infection affecting the upper reproductive tract. Symptoms may include lower abdominal pain, pain during sex, unusual discharge, fever, or bleeding between periods. Some people have mild symptoms or none at all.
PID is important to recognize because delayed treatment can increase the risk of long-term complications, including chronic pelvic pain, fertility problems, and ectopic pregnancy. These outcomes do not occur in everyone, and prompt medical care can help reduce the risk.
In people with a penis, certain STIs can cause inflammation of the epididymis, a structure beside the testicle that stores and transports sperm. This can lead to pain, tenderness, and swelling. Similar symptoms can occur for reasons unrelated to an STI.