It is a type of autoimmune disorder that occurs when the immune system mistakenly attacks healthy tissue, can be associated with tumors of the thymus, and can affect people of any age. It is more common in young women and older men. Difficulty breathing due to weakness of the chest wall muscles, difficulty swallowing or chewing, causing frequent gagging, choking, or drooling, difficulty climbing stairs, lifting objects, or getting up from a sitting position, difficulty to speak, move the head and drooping eyelids, facial paralysis or weakness of the facial muscles, hoarseness or change of voice, double vision and difficulty in gazing.

Treatment: There are three pillars a) symptomatic treatment with anticholinesterase drugs b) immunological treatment (thymectomy and immunosuppressants) c) immunomodulatory treatment (plasmapheresis and / or IgA) in severe and transitory situations.