Cubital tunnel syndrome is manifested by sensory and motor disorders in the hand due to compression of the ulnar nerve in the canal. The diagnosis is based on anamnesis, complaints, neurological status, provocative tests and is confirmed by electroneuromyography, ultrasound examination. At an early stage and with a mild degree of cubital canal syndrome, conservative treatment is indicated: avoidance of certain poses and movements, immobilization of the elbow joint and rational pharmacotherapy. With the ineffectiveness of conservative treatment, the presence of objective weakness and atrophy of the hand muscles, surgical treatment is indicated. The article discusses the etiology, pathogenesis, risk factors of development, principles of clinical and instrumental diagnosis and treatment of patients with cubital canal syndrome.