AQP4‐NMOSD patients had more multiple comorbidities (50%, n = 81/161) than MOGAD (25%, n = 5/20, p = 0.03) and more autoimmune disorders (AID) (40.4%, n = 65) than MOGAD (20%, n = 4, p = 0.09) and DN‐NMOSD (none, p = 0.004). The gene discussed is AQP4; the disease is autoimmune disease.