Low-level Laser Therapy in Pain and Perineal Healing in the Immediate Postpartum Period: a Randomized Clinical Trial.

Inclusion Criteria: Postpartum women/multiparous women aged 18 years or older; Postpartum women/multiparous women in the immediate postpartum period after vaginal birth; Postpartum women/multiparous women with spontaneous perineal laceration (Grade II, III, or IV); Postpartum women/multiparous women with an average pain score of at least 3 on the Visual Analog Scale (VAS); Labor duration up to 18 hours. Exclusion Criteria: Postpartum women/multiparous women classified as high-risk during pregnancy due to a diagnosis of gestational diabetes mellitus; type 1 or type 2 diabetes mellitus; chronic or pregnancy-specific hypertension; smoking; alcohol use; use of psychoactive substances, among others; Postpartum women/multiparous women who present postpartum complications (such as hemorrhage, difficulty in verbal communication, or sepsis); Postpartum women/multiparous women who develop clinical or hemodynamic complications after childbirth; Postpartum women/multiparous women whose newborns died or were admitted to a Neonatal Intensive Care Unit (NICU); Women with communication difficulties (impaired understanding or mental disorders).