High-intensity Laser Therapy for Neck Pain

Inclusion Criteria: * Participants must be at least 18 years old. * Both sexes (men and women) * Non-specific, chronic neck pain, defined as pain or discomfort in the cervical region between the superior nuchal line and the spinous process of T1 or the shoulder girdle, with the following criteria: neck pain in the last 3 months or more; a questionnaire score of cervical disability (NDI) equal to or greater than 5; and cervical pain of 3 or greater on the numerical pain scale (NPRS). Exclusion Criteria: * Neck or shoulder musculoskeletal injuries in the last 3 months (fractures, sprains, tendinopathies, dislocations, or muscle tears). * Osteosynthesis materials close to the shoulders, neck, or surrounding areas. * Wounds or skin changes in the shoulder and/or neck region (such as psoriasis, scars, or burns). * Analgesic, anti-inflammatory, or muscle relaxant drugs for permanent use. * Neurological alterations such as paresthesia, loss of sensation (partial or complete), decrease in strength, or color changes in the neck, arms, forearms, or hands. * Diagnosed photosensitivity. * Presence of solar urticaria or adverse reactions to sunlight. * The presence of dermatomyositis, systemic lupus erythematosus, hepatic porphyria, cutaneous carcinoid syndrome, or pellagra. * Cancer or tumors of some type have been diagnosed in the last 5 years. * Epilepsy.