Both myasthenia gravis and traumatic spinal cord injury are uncommon disorders and their concurrence is extremely rare. We report here the case of a man with stable myasthenia gravis with spinal cord injury due to a motor vehicle accident. His muscle strength and sensory function in all 4 limbs partially recovered during the initial hospitalization. However, after a later episode of pneumonia and urinary tract infection, muscle strength deteriorated and weakness of the ocular muscles occurred. A relapse of myasthenia gravis was confirmed by the elevated anti-acetylcholine receptor antibody titre. Muscle strength recovered rapidly after control of infection and treatment of myasthenia gravis exacerbation. In this case report, we show that spinal cord injury-related complications, including infection or emotional stress, could