Who is at risk myasthenia gravis?

Wide range of people: Myasthenia has been reported in people of all age groups, but it tends to be more common in people aged 50-70 or in women under 40. Conditions that increase your risk for developing myasthenia include: autoimmune disease (thyroid disease, lupus, rheumatoid, type i diabetes), thymoma, and exposure to certain medications (most famously an immunosuppressant and chelating agent called penicillamine).