Queefing happens when air gets trapped inside the vaginal canal and then gets pushed back out, creating a sound similar to passing gas. It’s completely normal, has nothing to do with the digestive system, and unlike a fart, it typically doesn’t have any odor. Nearly every woman or person with a vagina experiences it at some point, most commonly during sex, exercise, or certain body positions.
How Air Gets Trapped Inside
The vaginal canal is a flexible, muscular tube with textured walls made up of small folds. It’s not a sealed space. The opening can widen or shift shape depending on body position, muscle tension, arousal, and what’s happening physically. When something enters the vagina, or when the canal changes shape quickly, air can slip inside and become temporarily trapped. Once the walls compress again, whether from movement, muscle contraction, or a change in position, that air has nowhere to go but out. The result is the sound people call a queef.
Think of it like squeezing a small pocket of air out of a balloon. The sound isn’t produced by gas from digestion or bacteria. It’s just plain air being expelled through a narrow opening, which is why it doesn’t smell.
Why It Happens During Sex
Sex is the most common trigger because penetration repeatedly introduces and displaces air inside the vaginal canal. Each thrust can push air in, and changes in angle or depth can seal it temporarily before it escapes. Certain positions make this more likely, particularly any position where the hips are elevated or the torso is angled downward, like from behind. These angles open the vaginal canal wider and allow gravity to pull air inward. When you shift positions or your partner withdraws, the trapped air releases.
Arousal also plays a role. When you’re turned on, the vagina naturally expands and lengthens to accommodate penetration, a process called “tenting.” This creates more internal space for air to fill. Fingering, the use of toys, and oral sex can also introduce air, especially if there’s a lot of movement in and out.
Exercise and Other Non-Sexual Triggers
Sex isn’t the only cause. Yoga and Pilates are well-known triggers. Inverted poses like downward dog, bridge pose, and shoulder stands open the vaginal canal while your hips are above your torso, letting air flow in by gravity. When you transition to the next pose, especially one that engages your core and draws your belly inward, that air gets pushed out. It’s common enough in yoga classes that instructors generally don’t bat an eye.
Stretching, running, sit-ups, squats, and any movement that rapidly changes pressure in your abdomen or pelvis can do the same thing. Even something as simple as standing up quickly after lying down, inserting a tampon or menstrual cup, or getting a pelvic exam can cause it.
Pelvic Floor Strength and Frequency
How often someone queefs can be influenced by the strength and coordination of the pelvic floor muscles, the group of muscles that support the bladder, uterus, and vaginal canal. When these muscles are weaker or less coordinated, the vaginal opening may not stay as firm, making it easier for air to slip in and harder for the body to control when it comes out.
This is why queefing often becomes more frequent after childbirth. Vaginal delivery stretches the pelvic floor significantly, and it takes time for those muscles to recover their tone. A 2023 randomized controlled trial found that a structured program of Kegel exercises, done three times a day in different positions over six weeks, reduced vaginal flatulence in postpartum women. The exercises targeted both fast-twitch and slow-twitch muscle fibers by alternating quick squeezes with longer holds. Starting at five sets per day and building to 30 sets by week six, participants saw meaningful improvement.
Even outside of postpartum recovery, consistent pelvic floor exercises can help reduce how often it happens by improving muscle coordination around the vaginal opening. That said, even people with strong pelvic floors queef. It’s a mechanical event, not a sign of weakness.
Can You Prevent It?
You can reduce the frequency, but you can’t eliminate it entirely. During sex, minimizing full withdrawal between thrusts helps because it gives air less opportunity to enter. Avoiding positions that tilt the pelvis upward (or switching away from them when you notice air building up) can also help. Some people find that keeping their legs closer together during certain exercises reduces it.
During yoga, engaging your pelvic floor as you move into and out of inversions can limit how much air enters. But honestly, most of prevention comes down to accepting it as a normal body function and not something that needs fixing.
When Vaginal Gas Signals Something Else
In rare cases, frequent vaginal gas that smells foul could point to a vaginal fistula, an abnormal opening between the vaginal canal and the bladder or intestines. Fistulas are typically caused by trauma, surgery, or disease, not by normal activity. When a fistula connects the vagina to the intestines, actual digestive gas can pass through, which is why it would carry an odor.
Signs that something beyond normal queefing may be going on include a strong or foul vaginal odor, leaking urine or stool from the vagina, pain during sex or in the vulva and perineum, frequent urinary tract infections, or any discharge of pus. These symptoms warrant a medical evaluation. Regular, odorless queefing without any of these accompanying issues is not a health concern.