**Tendosynovitis** is an inflammation that occurs in the synovium and tendon (muscle), where muscles connect to bones or joints. Tenosynovditis nodosa is not a rare disease, but in many cases it has a negative impact on the patient. In some people, this disease is often accompanied by pain and impaired functionality of the affected limb. Typically, nodular tendositis affects the muscles located in the joint area, most often due to severe physical activity, other active sports activities, or household and work injuries of various etiologies. In addition, many doctors argue that the increase in the incidence of the disease is due to the widespread increase in the age of patients due to the aging population. Like any other disease of tendosynovoid nodules, treatment requires a strictly individual approach and should be carried out only by qualified specialists.