CIDP (Chronic inflammatory demyelinating polyneuropathy) is a neurological condition that involves inflammation in the nerves. The inflammation slowly but progressively destroys the protective covering of the nerves which is known as the myelin sheath. Symptoms can include slow but progressive weakness, pain and an impaired sensory function in the arms and legs. CIDP is therefore an inflammatory autoimmune disease, meaning that a person’s immune system begins to attack its peripheral nerves. CIDP is related to GBS (Guillain-Barre syndrome).