As the name suggests, these are syndromes in which the nerves are constricted. In principle, any nerve can be constricted at any anatomical location. Due to the anatomical comprssion, which are dependent on the respective nerve, there are corresponding symptoms such as tingling, pain, sensory disorders and even paralysis. Above all on the hand such sensory disturbances are perceived relatively quickly. In the best-known example, the carpal tunnel syndrome, the median nerve is compressed in the area of the wrist and typically leads to nocturnal pain and discomfort. If the constriction persists, the symptoms can range up to paralysis of certain muscles. As a rule, however, severe pain occurs beforehand, so that patients usually seek medical treatment early. Another well-known example is cubital tunnel syndrome. Here, the ulnar nerve in the area of the elbow is affected.