The Effect of Low-Level Laser Therapy in Carpal Tunnel Syndrome

Inclusion Criteria: * Existing written consent of the participating person after informed consent. * The patient is capable of giving consent. * Isolated surgery-induced CTS * CTS patients with pain (NRS between 2 and 6) and/or paresthesia and/or nocturnal pain that has been present for at least 3 months (pain reported using the "Numerical Rating Scale for Pain" (NRS) between 0 and 10). * Compliance with 3 weeks of cold light therapy. Exclusion Criteria: * Absence of informed consent * Patients under 18 years or over 80 years * Patients from protected groups as well as people who are not able to personally give consent * Participation in other clinical trials within the last 4 weeks before the start of the study * traumatic and atraumatic median nerve lesions/damage/narrowing * Previous operations in the area innervated by the median nerve or in the area of the affected upper extremity/hand * CTS recurrence of the affected hand * Thenar atrophy of the affected hand * Nerve diseases that affect the upper extremity including the hand (e.g. polyneuropathy) * Cervical radiculopathy C6/C * Osteoarthritis of the affected hand (e.g. rhizarthrosis) * Arthritis of the affected hand * Metabolic diseases that have an influence on the sensory or function of the hand * Vascular diseases affecting the upper extremity or hand (e.g. Raynaud's syndrome) * other compressions or injuries of the median nerve (e.g. thoracic outlet syndrome, scalene syndrome, pronator teres syndrome)