Female sexual dysfunction is known as the disorder experienced by a woman when changes occur in her usual sexual behavior. It is estimated that between 16 and 40% of women suffer from some form of sexual dysfunction, and this percentage increases with age.1 Among the painful disorders, dyspareunia stands out, which is defined as pain perceived in the pelvis associated with sex with penetration. It can be applied to women and men. It usually occurs with penile penetration, but is often associated with pain during the insertion of any object. It can apply to anal and vaginal intercourse. It is classically subdivided into superficial, when it affects the vulva and vaginal entrance, and deep, when the painful area is the cervix, bladder and/or the lower part of the pelvis.2 Another classification divides it into primary, associated with pain at the beginning of sexual life, and secondary, when it appears later.3 It directly affects physical health, as well as sexual and mental well-being. Consequently, it can lead to depression, anxiety and low self-esteem in women who experience it.4 Studies show an association between hyperactivity of the pelvic muscles and dyspareunia, which can have a significant impact on physical and mental health, leading to problems such as depression, anxiety, hypervigilance to pain, negative body image and low self-esteem, in addition to the possibility of leading to other sexual dysfunctions.5 Multidisciplinary treatment is highly recommended in this population and aims to address the various physical, emotional and behavioral aspects involved in sexual dysfunctions. This approach involves the collaboration of a team made up of specialized professionals, such as gynecologists, physiotherapists, sex therapists, psychologists and/or psychiatrists. Among these professionals, physiotherapy stands out as an intervention capable of improving sexual health, through individualized approaches for each patient. Considering that many patients with dyspareunia do not respond adequately to conventional drug therapy, there is a clear need to seek new therapeutic alternatives, such as photobiomodulation (PBM). Previous studies show positive results in the use of PBM in improving pain related to musculoskeletal and arthritic conditions. Furthermore, the application of PBM in the area of pelvic physiotherapy has been expanded. A study carried out by Lev-Sagie et al.6 showed positive results in the use of photobiomodulation in women with vestibulodynia, in relation to pain. Previous studies also indicate that intravaginal application of PBM has been effective in alleviating pain in conditions related to chronic pelvic pain, endometriosis, and pelvic pain of myofascial origin, which suggests that photobiomodulation may be a promising therapy for women with dyspareunia.7 ,8,9 In recent years, research has been carried out to investigate the presence and increase of inflammatory mediators in different painful musculoskeletal disorders10-14. A study that applied photobiomodulation to patients with low back pain observed changes in some biomarkers, in plasma or microdialysate, indicating that patients with low back pain who receive photobiomodulation may present changes in the levels of inflammatory mediators.15 But to date, few studies have been carried out on this topic, none of them applied to women with dyspareunia The scarcity of studies standardizing an application protocol, which observes time of effect and analysis of inflammatory biomarkers in the use of photobiomodulation in women with dyspareunia, justifies the need for research on the topic. Therefore, the objective of this study is to compare the effects of vulvar and intravaginal application of PBM compared to the sham group on the pain and sexual function of women with dyspareunia in the immediate post-intervention moments and in follow-ups of 15, 30, 90 and 180 days.
