Myasthenia gravis often refers to myasthenia gravis and can be caused by a variety of reasons. How long a patient lives depends on individual circumstances, depending on the severity and rate of progression of the disease, etc., and requires a problem-specific analysis. Myasthenia gravis is caused by immune system dysfunction. Patients usually have symptoms such as droopy eyelids, diplopia, and easy muscle fatigue and weakness, and are usually seen in women aged 20-40 years and men aged 50-80 years. In patients with mild myasthenia gravis, if scientific and regular treatment is carried out and the disease does not continue to progress, patients may survive for a long time. However, about 15-20% of patients will suffer from myasthenia gravis crisis as their disease worsens, which may be fatal due to respiratory muscle involvement, and their life expectancy will be significantly shortened. Therefore, patients with myasthenia gravis need to be treated aggressively to prevent progression of the disease, which can affect the prognosis if it progresses to myasthenia gravis crisis.