Effectiveness of Low-intensity Laser on Pain in Patients With Supraspinatus Tendinopathy.

Inclusion Criteria: * Score of 3 or higher on the VAS scale for the shoulder. * Adequate cognitive ability for comprehension. * Rotator cuff tendinopathy confirmed by ultrasound at the study center, either due to tendon inflammation, presence of hypoechoic areas, calcification, fibrillar disorganization, and/or neovascularization in the supraspinatus muscle. * Pain in the proximal lateral part of the arm that worsens with abduction. Exclusion Criteria: * Contraindications specific to laser treatment (e.g., tumors, presence of pacemaker or defibrillator, pregnancy, etc.). * History of glenohumeral fracture and rheumatoid arthritis. * Rheumatic, neurological, or structural polymyalgia affecting the joint. * Previous surgeries. * Pregnant or breastfeeding women. * Taking anticoagulants or antiplatelet agents. * Diabetes mellitus. * Cardiac dysfunction. * Infiltrative and/or rehabilitative treatment in the two months prior to recruitment. * Pre-existing conditions associated with pain in the upper extremities. Difficulties with follow-up. * Depression. * Treatment with another intervention; during the study, they will not be able to undergo it.