The average life expectancy for myasthenia gravis is not clearly defined and there is no authoritative data yet, it may be a few years or a decade, or it may be longer or shorter. Myasthenia gravis varies in severity and treatment effectiveness, and the length of life expectancy varies somewhat. If myasthenia gravis is mild and sensitive to treatment, life expectancy is relatively long and may be more than a decade or more. If myasthenia gravis is more severe and not very sensitive to treatment, and the condition continues to worsen, the patient’s survival time may be shortened. However, myasthenia gravis crisis is potentially life-threatening and is the most critical state for patients with myasthenia gravis, and the mortality rate has declined significantly as treatment has progressed. It is recommended that patients diagnosed with myasthenia gravis, standardized treatment under the guidance of a professional doctor, can use prednisone acetate tablets, neostigmine bromide tablets, azathioprine tablets and other drugs for treatment, so as to avoid delays in the condition, affecting the life expectancy.