Nasogastric tube feeding is a common method of parenteral nutrition. We observed ulcers on the epiglottis caused by a nasogastric tube in three adults with severe motor and intellectual disabilities (SMID) during examination with a laryngeal fiberscope while swallowing. These ulcers were healed by changing the method of inserting the nasogastric tube. The patients were three men aged 25, 39, and 55 years. The muscle tone of the whole body was increased in all of the patients. Two patients had severe scoliosis, and the other patient had lordosis in the thoracic vertebrae and had received laryngo-tracheal diversion. All of the patients received intermittent or continuous respiratory care. The pharynx of the patients with severe scoliosis became thinner and the feeding tubes ran obliquely. The feeding tube in the patient who received laryngo-tracheal diversion entered the cut and closed trachea through the glottis. Ulcers were observed on the laryngeal side of the epiglottis in all of the patients. The ulcers were healed by preventing feeding tubes from running obliquely or by using the naso-gastric tube made of different materials in the patients with severe scoliosis. In the patient who received laryngo-tracheal diversion, we succeeded in avoiding the glottis by keeping his face forward while inserting the feeding tube. Then feeding tubes were changed with guidewires, and the ulcers were healed. When using nasogastric tube feeding for persons with SMID with a large increase in muscle tone and/or with severe scoliosis, adopting a method of inserting feeding tubes that avoids damaging the epiglottis with a laryngeal fiberscope is required.