Pain during sex is common, affecting an estimated 10% to 20% of women in the U.S. at any given time. It has a wide range of causes, from temporary dryness to chronic conditions like endometriosis, and the location and timing of the pain often points directly to what’s going on. Understanding where you feel pain and when it happens is the fastest way to narrow down the cause.
Entry Pain vs. Deep Pain
Pain during sex generally falls into two categories, and distinguishing between them matters because they point to different causes. Entry pain (sometimes called superficial dyspareunia) is felt right at the vaginal opening during initial penetration. It tends to involve dryness, skin irritation, infection, or tight pelvic floor muscles. Deep pain happens further inside during thrusting and is more often linked to conditions affecting the uterus, ovaries, bladder, or bowel.
Some people experience both. Paying attention to exactly where and when the pain occurs, whether it’s a burning at the entrance or a deep ache with certain positions, gives you and your provider the clearest starting point.
Dryness and Hormonal Changes
Insufficient lubrication is one of the most straightforward reasons sex hurts. Without enough moisture, friction against the vaginal walls causes burning, stinging, or a raw feeling. This can happen simply from not enough arousal time, but hormonal shifts are a major driver. During menopause, lower estrogen causes the vaginal lining to become thinner, less stretchy, and drier, with reduced blood flow to the area. The vaginal canal can also narrow and shorten. Up to 50% of women going through menopause experience these changes.
Menopause isn’t the only hormonal trigger. Breastfeeding suppresses estrogen in a similar way, and roughly 40% of women report painful sex three months after a vaginal delivery. By six months postpartum, that number drops to about 20%, but for some it persists longer. Hormonal birth control can also reduce lubrication in some people.
If dryness is the issue, using a lubricant can help immediately. Not all lubricants are equal, though. The World Health Organization recommends water-based lubricants with an osmolality below 1,200 mOsm/kg and a pH around 4.5, which matches normal vaginal chemistry. Products with high osmolality or mismatched pH can irritate tissue and disrupt the vaginal microbiome. Avoiding lubricants with fragrances, warming agents, or glycerin (which can feed yeast) is a good baseline. For hormonal dryness that doesn’t resolve with lubricant alone, prescription options like topical estrogen or vaginal hormone inserts can restore tissue thickness and moisture over time.
Tight or Spasming Pelvic Floor Muscles
The pelvic floor is a group of muscles that supports the bladder, uterus, and rectum. When these muscles are stuck in a state of constant contraction, a condition called hypertonic pelvic floor, they can’t relax enough to allow comfortable penetration. The result is a tight, clenching sensation at the vaginal entrance that makes sex painful or sometimes impossible. This involuntary tightening is what’s historically been called vaginismus.
Pelvic floor tension doesn’t always have an obvious cause. It can develop after a painful experience (a difficult delivery, a yeast infection, a previous instance of painful sex), from chronic stress, or from habits like holding tension in the lower body. The pain itself creates a cycle: your muscles tighten in anticipation of pain, which makes penetration hurt more, which reinforces the tightening.
Pelvic floor physical therapy is the most effective treatment for this pattern. A specialized therapist uses internal manual techniques to release tight muscles, and research shows significant improvement in pain scores after about five weeks of twice-weekly sessions, with benefits lasting months afterward. Therapists also use tools like biofeedback (which helps you visualize muscle activity), graduated vaginal dilators, and home exercises. Internal manual therapy tends to be most effective, followed by education about the condition and at-home dilator practice.
Pain at the Vaginal Opening: Vestibulodynia
If you feel sharp, burning pain specifically at the vaginal entrance when anything applies pressure there, you may have vestibulodynia. This is chronic pain localized to the vestibule, the tissue just inside the labia surrounding the vaginal opening. The hallmark is that touch or pressure “provokes” the pain: sex, tampon insertion, a pelvic exam, even tight clothing or prolonged sitting can trigger it. For a diagnosis, the pain needs to have been present for at least three months.
The exact cause isn’t fully understood, but several factors increase risk: a history of chronic yeast infections, sensitivity to irritants in scented soaps or detergents, genetic predisposition to chronic pain or inflammation, fibromyalgia, and painful bladder syndrome. There’s no single diagnostic test. Providers typically use a cotton swab to press gently on different areas around the vaginal opening while you rate the pain, which helps map exactly where the sensitivity is concentrated.
Treatment varies depending on severity and may include pelvic floor therapy, topical medications to calm nerve sensitivity, and avoiding known irritants. Many people see improvement, but it often takes a combination of approaches and some patience.
Deep Pain and Endometriosis
Deep, aching pain during sex, especially in certain positions, often points to something happening further inside the pelvis. Endometriosis is one of the most common culprits. In this condition, tissue similar to the uterine lining grows outside the uterus, and when these growths sit on the ligaments behind the uterus (the uterosacral ligaments), deep penetration can press directly against them. A study in Fertility and Sterility found that over 76% of endometriosis patients reporting deep pain during sex had lesions on these specific ligaments.
Other causes of deep pain include ovarian cysts, fibroids, pelvic inflammatory disease, and conditions affecting the bladder or bowel. The pain is often position-dependent, meaning some angles are worse than others, which can be a useful clue both for you and your provider.
Infections and Skin Conditions
Active infections are a common and treatable cause of pain during sex. Yeast infections cause inflammation and swelling that make the vaginal walls sensitive to friction. Bacterial vaginosis changes vaginal pH and can cause irritation. Sexually transmitted infections like chlamydia or trichomoniasis can inflame the cervix or vaginal tissue. Urinary tract infections can make the area around the urethra tender enough that pressure during sex is uncomfortable.
Skin conditions affecting the vulva, like lichen sclerosus or contact dermatitis from soaps, laundry detergent, or latex, can also cause pain concentrated at the entrance. These are often visible on exam, with redness, thinning skin, or small tears.
What a Diagnosis Looks Like
If painful sex is persistent, a provider will typically start with a detailed history: when the pain started, where exactly it occurs, whether it happens every time or only in certain situations, and what it feels like. A pelvic exam follows, often including the cotton swab test to pinpoint tender areas. Your provider may check for infections using vaginal swabs, pH testing, or cultures. A musculoskeletal evaluation of the pelvic floor helps identify whether muscle tension or dysfunction is contributing.
Because many conditions share overlapping symptoms, diagnosis sometimes involves ruling things out one by one. Vulvodynia, for example, is specifically a diagnosis of exclusion, meaning providers need to confirm that infections, skin conditions, and hormonal changes aren’t responsible before assigning it. If deep pain is the primary symptom, imaging like ultrasound may be used to look for endometriosis, cysts, or fibroids.
Practical Steps That Help
While you work toward identifying the cause, a few things can reduce pain in the meantime. Extending foreplay gives your body more time to produce natural lubrication and allows the vaginal canal to lengthen and relax. Using a high-quality, pH-balanced lubricant reduces friction. Experimenting with positions that allow you to control depth and angle of penetration can help, particularly if deep pain is the issue.
Avoid products that contact the vulva and contain fragrance, dyes, or harsh chemicals, including scented tampons, douches, and certain laundry detergents. If you notice pain worsening at specific times in your menstrual cycle or after starting a new medication, tracking that pattern gives your provider useful information. Pain during sex is not something you need to push through. It’s a signal, and in most cases, the underlying cause is identifiable and treatable.