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For the vast majority of women, bacterial vaginosis (BV) is easily treated and doesn't cause any further problems. However, if the condition isn't treated, there's a small risk you may develop complications.
There's some evidence to suggest untreated BV symptoms during pregnancy can increase your risk of pregnancy-related complications, particularly if you've had these problems in the past.
Pregnancy-related complications that have been associated with BV include:
See your GP or visit a sexual health or genitourinary medicine (GUM) clinic as soon as possible if you're pregnant and have symptoms of BV. While your risk of developing these complications is small, treatment may reduce the risk.
If BV hasn't caused symptoms, there's no evidence to suggest it increases the risk of complications in pregnancy. Treatment might not be recommended if BV is detected while you're pregnant but don't have any symptoms.
There's evidence that having BV can make you more at risk of catching sexually transmitted infections (STIs), such as chlamydia. This is possibly because the change in bacteria levels inside your vagina reduces your protection against infection.
Although a link isn't entirely clear, some evidence suggests that BV may increase your risk of developing pelvic inflammatory disease (PID). PID causes infection and swelling of the upper female genital tract, including the womb, fallopian tubes and ovaries.
Symptoms of PID include:
If diagnosed at an early stage, PID can usually be treated successfully with a course of antibiotics. However, an estimated one in five women with the condition become infertile because of severe scarring on the fallopian tubes.
It's important to see your GP if you experience any symptoms of PID. Delaying treatment or having repeated episodes of PID can increase your risk of infertility.
Women who have BV and are using in vitro fertilisation (IVF) may have a lower success rate and an increased risk of early miscarriage.
If you're having IVF and have symptoms of BV, see your GP or speak to your infertility specialist.
It's relatively common for BV to recur after treatment with antibiotics. It's estimated that more than half the women treated for BV develop the condition again within three months.
If your BV returns, see your GP or sexual health or GUM clinic to discuss further treatment options.
Bacteria are tiny, single-celled organisms that live in the body. Some can cause illness and disease, and some are good for you.
Inflammation is the body's response to infection, irritation or injury, which causes redness, swelling, pain and sometimes a feeling of heat in the affected area.
The loss of pregnancy during the first 23 weeks.
Sexually transmitted infections (STIs)
STIs are diseases passed on through intimate sexual contact, such as vaginal, oral or anal sex.
Body tissue is made up of groups of cells that perform a specific job, such as protecting the body against infection, producing movement or storing fat.
The uterus or womb is a hollow, pear-shaped organ in a woman where a baby grows during pregnancy.
The vagina is a tube of muscle that runs from the cervix (the opening of the womb) to the vulva (the external sexual organs).