High Intensity Laser Therapy (HILT) on Myofascial Trigger Points.

This study is evaluating whether High Intensity Laser Therapy (HILT) can effectively treat myofascial trigger points — tight, painful knots in the upper trapezius muscle of the neck and shoulder region. These trigger points are a common cause of neck pain and headaches, and laser therapy is a non-invasive treatment option that may reduce pain and improve muscle function. The study is being conducted among university staff and students in Chile, comparing HILT against other treatments to see which provides the most relief. You may be eligible if: - You are 18 years of age or older - You are a staff member or student at Andrés Bello University's Casona las Condes Campus - You have been diagnosed with myofascial trigger points in the upper trapezius muscle You may NOT be eligible if: - You have had a musculoskeletal injury to the neck or shoulders in the last 3 months - You have metal implants or osteosynthesis hardware near the shoulders or neck - You have wounds, skin conditions (e.g., psoriasis, burns), or scarring in the treatment area - You take regular analgesic, anti-inflammatory, or muscle relaxant medications - You have neurological symptoms (e.g., numbness, weakness) in the arms or hands - You have epilepsy, cancer, photosensitivity, or certain skin/autoimmune conditions Talk to your doctor to see if this trial is right for you.