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Overview
What Is a Vaginal Infection?
A vaginal infection is an imbalance, inflammation, or infection affecting the tissues of the vagina. Common causes include yeast overgrowth, bacterial vaginosis, sexually transmitted infections, and irritation from products or hormonal changes. Anyone can develop vaginal symptoms, although risk varies with health conditions, medications, sexual activity, and life stage. Symptoms and treatment depend on the specific cause.
Symptoms
Vaginal Infection Symptoms
- Vaginal itching.
- Vaginal burning.
- Redness or swelling of the vulva or vaginal opening.
- Unusual vaginal discharge.
- A change in vaginal discharge odor.
- Pain with urination (dysuria).
- Pain during sex (dyspareunia).
- Sores or blisters.
| Possible cause | Common pattern | Important limitation |
|---|---|---|
| Yeast infection | Intense itching, burning, redness, and often a thick, white discharge without a strong odor. | These yeast infection symptoms can overlap with other conditions, and some people have few or no symptoms. |
| Bacterial vaginosis | A thin discharge with a noticeable, sometimes fish-like odor; irritation may occur. | Symptoms of a BV infection are not definitive, and BV can occur without symptoms. |
| Sexually transmitted infection | Discharge changes, burning with urination, pelvic discomfort, sores, or bleeding may occur; trichomoniasis can cause odor or irritation. | Some sexually transmitted infections cause no symptoms, so testing is needed after possible exposure. |
Causes
What Causes a Vaginal Infection?
The vagina normally contains a balance of microorganisms that help protect its environment. Symptoms can develop when yeast overgrows, bacterial communities become unbalanced, a sexually transmitted pathogen is present, or vaginal tissue is irritated or becomes thinner after hormonal changes. These different processes explain why the answer to “what causes yeast infection” is not the same as the cause of every vaginal infection.
| Cause or condition | What happens | Can it spread? |
|---|---|---|
| Yeast infection | Candida yeast grows excessively and irritates vaginal tissues. | Usually no. It is not generally considered a sexually transmitted infection. |
| Bacterial vaginosis | The normal balance of vaginal bacteria changes, allowing some bacteria to become more common. | Not usually spread as a classic STI, although sexual activity can affect risk. |
| Sexually transmitted infections, such as trichomoniasis | A sexually transmitted parasite or other pathogen infects genital tissues. | Yes, these infections can spread through sexual contact. |
| Noninfectious irritation or atrophic vaginitis | Products, friction, or low estrogen can irritate or thin vaginal tissues without an infection. | No. These conditions are not contagious. |
Risk Factors
Risk Factors for Vaginal Infection
- Recent antibiotic use (modifiable with clinician guidance) can disturb the usual balance of vaginal microorganisms.
- Pregnancy or hormonal changes can alter vaginal tissues and the local microbial balance.
- Uncontrolled diabetes can increase the likelihood of yeast overgrowth.
- A weakened immune system can make some infections more likely or harder to clear.
- Douching or using scented vaginal products can irritate tissues and disrupt the vaginal environment.
- A new or multiple sex partners can increase exposure to some infections.
- Condomless sex can increase the risk of sexually transmitted infections.
- A history of a prior infection can increase the chance of recurrence.
Having a risk factor does not prove that someone has a vaginal infection. These infections can also occur without an obvious risk factor.
Complications
Vaginal Infection Complications
Many vaginal infections improve with the correct treatment. However, untreated bacterial vaginosis or sexually transmitted infections can contribute to pelvic inflammatory disease, fertility problems, pregnancy complications, or an increased risk of acquiring some STIs, including HIV. Uncomplicated yeast infections usually do not cause these complications, but persistent or recurrent symptoms still need review.
- Seek timely care for symptoms during pregnancy.
- Arrange an evaluation for symptoms that persist or return after treatment.
- Get medical advice for pelvic or lower abdominal pain.
- Seek care if you have a fever.
- Have sores or blisters assessed by a clinician.
- Report unexpected vaginal bleeding.
- Arrange testing after possible exposure to a sexually transmitted infection.
Diagnosis
How Vaginal Infections Are Diagnosed
Diagnosis starts with questions about your symptoms, menstrual and sexual history, medications, pregnancy status, and prior infections. A clinician may then perform an external and internal examination when appropriate. This information helps determine which tests can identify the cause of the vaginal symptoms.
- Vaginal pH testing can provide a clue about the vaginal environment.
- Microscopy of vaginal fluid can help identify yeast, bacteria, or other changes.
- A vaginal swab can be tested for yeast or bacterial causes.
- Nucleic acid or other laboratory tests can check for sexually transmitted infections.
WHY TESTING MATTERS
Similar symptoms can have different causes
Yeast infection symptoms can overlap with bacterial vaginosis, trichomoniasis, dermatitis, and other conditions. Avoid repeated self-treatment without confirmation, especially when symptoms persist or return.
Treatment & Management
Vaginal Infection Treatment and Management
| Likely cause | Typical treatment approach | Key management point |
|---|---|---|
| Confirmed yeast infection | Topical or oral antifungal medicine. | An antifungal is used for yeast; antibiotics do not treat a yeast infection. |
| Bacterial vaginosis | Prescription antibiotics, taken by mouth or used locally as directed. | Complete the prescribed course and seek review if symptoms recur. |
| Trichomoniasis or another STI | Prescribed treatment targeted to the identified infection. | Sex partners may need testing or treatment, and sex may need to be avoided until advised. |
| Noninfectious vaginitis | Removal of irritants and, when appropriate, locally prescribed hormonal treatment or other care. | Treatment depends on whether irritation, tissue changes, or another condition is responsible. |
An antifungal tablet for yeast infection is not appropriate for every type of vaginal infection. Pregnancy can change which yeast infection medicine or other treatment is safe, so ask a clinician before using medication. Follow the prescribed course and do not share medicine with anyone else.
- Avoid douching and scented products around the vagina.
- Keep the genital area dry and change damp clothing when possible.
- Wear breathable underwear.
- Avoid sex if it is painful or aggravates symptoms.
- Follow clinician guidance about partner testing or treatment when an STI is possible.
Prevention
How to Help Prevent Vaginal Infections
- Do not douche, because douching can disrupt the vaginal environment.
- Avoid scented vaginal products and fragranced soaps that may cause irritation.
- Use condoms or other barrier methods to reduce the risk of sexually transmitted infections.
- Limit unnecessary antibiotics and use them only with clinician guidance.
- Keep diabetes controlled with an individualized care plan.
- Change out of wet clothing promptly.
Vaginal infections are not caused by being unclean. Probiotics are not a guaranteed prevention method, and recurrent infections require individualized medical advice rather than repeated over-the-counter treatment.
Outlook and Prognosis
Outlook for Vaginal Infections
Most vaginal infections improve after the correct treatment. Symptoms may persist or return if the diagnosis is wrong, treatment is incomplete, an underlying condition is present, or reinfection occurs. Identifying the specific cause is important for lasting relief.
When Should You See a Doctor
When Should You See a Doctor?
- See a clinician for first-time vaginal infection symptoms.
- Arrange medical advice for symptoms during pregnancy.
- Seek testing for symptoms that begin after a new sexual partner.
- Have foul-smelling or unusual discharge evaluated.
- Seek care for pelvic pain.
- Contact a clinician if you have a fever.
- Have sores or blisters checked.
- Report unexpected bleeding.
- Arrange review if symptoms persist after treatment.
- Seek advice for frequent recurrences.
GET MEDICAL HELP
Some symptoms need prompt assessment
Seek urgent medical care for severe pelvic pain, high fever, fainting, heavy bleeding, or rapidly worsening illness. Routine itching or discharge still deserves timely evaluation when it is new, persistent, recurrent, or associated with pregnancy or possible STI exposure.
Branches
2 topics
Vaginal Infection
Gynecology & Obstetrics
Vaginal Infection
Infectious Diseases
