Introduction

A chronic form of vulvar pain known as vestibulodynia affects at least 16% of American women. Healthcare practitioners frequently misdiagnose or fail to diagnose the disease because they lack sufficient understanding.¹

Brief anatomy

The word vestibule, which means "a small cavity or a space at the entrance of a canal," is derived from the Latin vestibulum.² The area between the labia minora and the glans clitoridis (clitoris), which extends posteriorly to the anterior margin of the perineum, is known as the vaginal vestibule. The term "perineum" refers to the region that is inferior and posterior to the posterior vestibule, reaching to the anal margin. It should be mentioned that the definition of perineum employed in anatomical texts differs from the more widely accepted clinical definition.³

The urethra, vagina, and ducts of the larger vestibular glands are all located within the vestibule.² Vestibulum vaginae, vaginal introitus, and vestibulum pudendi are among the synonyms. Although the name "vulval" (vulvar) vestibule has occasionally been used to refer to it, the vaginal vestibule is a more acceptable phrase due to the inclusion of the word "canal," which implies vagina, in the definition above.

Understanding vestibulodynia

Vestibulodynia is a chronic pain syndrome that can cause peripheral or central nervous system sensitivity in addition to localised inflammation or damage.⁴ Vestibulodynia, also known as provoked localized vulvodynia and formerly termed the “vulvar vestibulitis syndrome,” is characterized by a severe, burning/sharp pain that occurs in response to pressure localized to the vulvar vestibule.⁵ 

Cutaneous, stinging, burning, or any combination of these sensations along with rawness at the vaginal entrance are the main characteristics of the condition.⁴

Women with vestibulodynia consistently report sexual impairment, according to multiple controlled studies.⁶ These impairments include decreased sexual arousal and desire, fewer sexual encounters, difficulty achieving an orgasm, and decreased sexual satisfaction.

These ladies also appear to have behavioural, cognitive, and emotional responses to their discomfort. Researchers who employ quantitative methods have contended that these women traumatise their suffering by ruminating over it, magnifying it, and exhibiting fear of it.⁷

Classification

Currently, the patient's location and pain symptoms are used to make the diagnosis. The symptoms could be "localised" to a particular location, like the vaginal vestibule or the clitoris, or they could be "generalised" over the entire vulva. Pain can be classified as "unprovoked" when it doesn't require touch, "provoked" when it is brought on by direct contact, putting in a tampon, or "mixed" when it does.^7,8

Prevalence and epidemiology in europe

An epidemiological profile can be created by analyzing several European registers using the ICD 10 (code N 76.3 of the International Classification of Diseases), national registers, significant epidemiological research⁹ and surveys of gynaecologists in European nations. Provoked Vestibulodynia (PVD in Europe. According to F Murina's study on the Progetto Vu-net registry in Italy, PVD is responsible for 72.6% of cases of vulvar pain. It is believed that between 10 and 16% of women are affected, and it peaks in frequency between the ages of 20 and 29 (29%).⁹ Only 10–25% of patients receive the accurate diagnosis on their first visit to the gynecologist. Of gynecologists, 45 to 65 percent lack diagnostic expertise about PVD. 

Pathophysiology

Experts generally concur that two mechanisms are involved:

1. Unlike other vulvar tissues or the vagina, the vulvar vestibule is an anatomical structure that is especially rich in nerve endings
2. Central and peripheral sensitivity associated with the hyperalgesia phenomenon

When there is no or minimal tissue damage seen during a clinical examination or diagnostic test, the occurrence of chronic pain is explained by the sensitization of the peripheral and central nociceptive systems, this represents a paradigm change from the traditional anatomic-clinical model, which holds that the significance of the tissue defects determines how much pain there is. Furthermore ,Mast cell activations next to nerve endings in the vulvar vestibule are linked to severe neuro-inflammatory changes in F Murina's hyperalgesia phenomenon.^10,11

Others include:

1. Evidence of Perineal dysfunction, which includes a marked hypertonic tendency, a decrease in the flexibility of the systems governing muscular relaxation capabilities, and a loss in muscular strength¹²
2. Genetic factors: Numerous instances of family cases of PVD aggregating in front of have been reported. Patients with PVD have a hereditary predisposition to discomfort and inflammation, according to several studies¹³

Pelvic hypersensitivity mechanisms may be aggravated, which explains why comorbidities such dysmenorrhea, irritable bowel syndrome, and painful bladder syndrome are frequently associated.¹⁴

How Is vestibulodynia diagnosed?

Vestibulodynia typically has no outward signs, though redness can happen. Typical diagnoses include:

1. Comprehensive medical history and symptom discussion
2. Physical examination
3. Perform a pelvic exam to thoroughly inspect the vulva and vagina
4. Using a vaginal discharge sample, one can test for vaginal infections, including yeast infections.
5. "Touch test" with a cotton swab to identify highly sensitive spots in the vestibule
6. During the pelvic exam, if any skin alterations are discovered, do a biopsy or colposcopy¹⁵

Pregnancy and vestibulodynia

Special consideration should be given to women with vestibular pain in both obstetric and gynecological practices. The likelihood of these women staying nulliparous is higher. Individuals who give birth are more likely to request an elective cesarean section and to deliver their child via one.¹⁶

Furthermore perineal lacerations are more common in women who give birth vaginally. It is yet unknown if treating women for potential delivery anxiety and providing them with a scheduled cesarean procedure will be beneficial.¹⁷ Although  sufferers may be just as likely as other women to bring their pregnancy to term, they may also have a greater risk of Cesarean section deliveries, which may indicate that some vulvodynia sufferers are more prone to endure inconsistent discomfort.

Consensus for first-line treatment

1. Local anaesthetics (Lidocaine 2–10%) applied twice daily over an extended period of time to treat vulvar vestibule local hyperalgesia. Prior to intercourse, local therapy may also be employed
2. Pereineal rehabilitation which include gradual manual endo-cavitary muscle relaxation, perineal and global external therapy, and perineal function recovery techniques are all included in perineal rehabilitation
3. Cognitive-behavioral therapeutics: cognitive psychotherapy, psychosexual and trauma therapies, central therapies such as EMDR or Hypnosis. The initial therapeutic protocol, here summarized, benefits, in addition to the expert consensus, from a high level of proof of effectiveness, as confirmed by the levels of scientific evidence found in the literature, with grade A and B levels, for each of the three items^{18, 19, 20,21}

Second-line therapies

In light of the findings documented in the literature, a wide range of treatment choices have been presented in the event that the first-line therapeutic protocol fails, but their actual use and specific indication have not been able to be verified.

In light of the findings documented in the literature, a wide range of treatment choices have been presented in the event that the first-line therapeutic protocol fails, but their actual use and specific indication have not been able to be verified.

Intrauterine vestibular infiltrations: hyaluronic acid, corticosteroids, or local anaesthetics. As far as treating PVD is concerned, none of them have proven to be effective.²²

On the other hand, a significant drawback of the infiltrations is that they cause extreme discomfort in a hyperalgesic vestibular location.

• Additional topicals being evaluated for the treatment of vulvar vestibule hyperalgesia include gabapentin, amitriptyline, ketamine, and botulinum toxin^13,16
• Injections of botulinum toxin: according to a number of papers, these injections have a grade C level of evidence and are therapeutically effective in the vulvar vestibule²³

TENS systems: with Grade B evidence levels, electrical transcutaneous nerve stimulation (TENS) of the vulvar vestibule seems beneficial in the treatment of Parkinson's disease.²⁴

• The CO2 Laser: a relatively new and promising method for treating F Murina,²⁵ particularly in the postmenopausal setting when combined with menopausal urogenital syndrome treatment. Nevertheless, current research²⁶ does not support a meaningful efficacy in the treatment of PVD
• Lipofilling: a recent proposal suggests treating painful perineal wounds with fat growth factors.²⁷ The E. Bautechniques show great promise, especially when applied to tissue lesions and fissures
• Vestibulectomy: Vestibulectomy can be performed in a variety of ways. Including the periurethral vestibule and even the inter-clitorideal-urethral vestibule,²⁸ the simple posterior vestibulectomy can be connected to the vestibulectomy of the lateral vestibules

Summary: pregnancy and vestibulodynia

Vestibulodynia is a chronic vulvar pain syndrome affecting at least 16% of women, characterized by sharp, burning pain in the vulvar vestibule, often causing sexual dysfunction. Diagnosis is challenging, with symptoms often misinterpreted due to lack of knowledge among healthcare professionals. The condition is classified by pain location (localized, generalized) and response (provoked, unprovoked). Prevalence is high among women aged 20–29, with only 10–25% receiving an accurate diagnosis initially.

Pathophysiology suggests that vestibulodynia involves both peripheral and central nervous system sensitivity, often exacerbated by comorbidities like dysmenorrhea and IBS. The condition is difficult to diagnose, relying on thorough physical exams and diagnostic tests such as the "touch test."

Pregnancy in women with vestibulodynia may increase the likelihood of nulliparity, cesarean deliveries, and perineal lacerations. However, the benefits of elective cesarean delivery for pain management remain uncertain. First-line treatments include local anesthetics, perineal rehabilitation, and cognitive-behavioral therapy, all supported by strong evidence. Second-line treatments, like botulinum toxin injections and TENS, show promise but lack definitive proof of effectiveness.

Overall, effective management of vestibulodynia in pregnancy requires specialized care to address both physical and emotional challenges, with ongoing research into advanced treatments.