Bacterial vaginosis often clears up on its own. But in some women it doesn't go away on its own. And for many women it comes back after it has cleared up. Antibiotic treatment works for some women but not others.
Your risk of complications from bacterial vaginosis is higher:
During pregnancy. Compared to pregnant women who don't have it, women who have bacterial vaginosis during pregnancy have a higher risk of early (preterm) delivery or of uterine infection after pregnancy. Also, pregnant women may have an increased risk of miscarriage.
When exposed to HIV or other sexually transmitted infection. Women who have bacterial vaginosis when they are exposed to sexually transmitted infections (including HIV) have an increased risk of becoming infected with the sexually transmitted infection.