| Symptom fluctuation is a hallmark of myasthenia gravis |
| Three cases of myasthenia gravis with low or no fluctuation are presented |
| Absence of fluctuation can further delay diagnosis and treatment |
| Low-fluctuating myasthenia gravis could be an underestimated phenotype of this disease |
| Patients with chronic fatigability can benefit from screening for myasthenia gravis |
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