Cervical radiculopathy is a common disease in everyday neurology clinical practice. However, a number of symptoms of cervical radiculopathy can occur in other diseases of nervous system and musculoskeletal apparatus. In particular, pain and weakness are observed in diseases of skeletal muscles and can be incorrectly interpreted as a damage of peripheral nerves, roots and plexuses. Careful collection of anamnesis and topical diagnosis make it possible not only to suspect the clinical development of myopathy, but also to exclude the pathology of other nervous structures. Additional methods of laboratory and instrumental investigation play an important role in etiology clarifying the myopathy causes and determining the further directions of patient management. A clinical case of progressive hypokalemic myopathy due to Conn’s syndrome, initially diagnosed as «cervical radiculopathy», is presented. Surgical removal of the aldosterone-producing adenoma resulted in relief of symptoms and positive dynamics of laboratory parameters.