Myasthenia Gravis Registry in China

Inclusion Criteria: * Fluctuating weakness in skeletal muscles, such as extraocular, bulbar, limb muscles, etc.. Demonstrating fluctuation and fatigability: Weakness is usually worse in the morning and improves with rest; worsens with sustained activity. * Patients themselves or their guardians can understand and sign the informed consent form. To meet the eligibility criteria, at least one of the following additional criteria must be met: * a. Positive Tensilon test; * b. Decrease in compound muscle action potential by more than 10% with low-frequency repetitive nerve stimulation or widening of the "jitter" (the variability in time of the second action potential relative to the first) on single-fiber electromyography, with or without blocking; * c. Positive antibodies: Serum testing positive for AChR antibodies, MuSK antibodies, or LRP4 antibodies. Exclusion Criteria: * Patients with mental illness who cannot cooperate. * Patients with multiple organ dysfunction or in extremely critical condition, unable to complete relevant medical history collection or evaluation.