If you can only lie flat on your right side at night, the symptoms of back discomfort may be caused by back fasciitis, scoliosis, reflux gastritis and thoracic vertebrae small joint disorders. 1. Fasciitis of the back: prolonged exposure of the back to cold or long-term maintenance of incorrect posture will lead to tension in the fascia of the back, which is prone to cause aseptic inflammation of the fascial tissues, resulting in discomfort such as pain in the back and discomfort when sleeping flat at night. 2. Scoliosis: If you suffer from scoliosis, because of the curvature of the spine, when you sleep at night, lying flat will be uncomfortable because of the curvature of the back, and you will be comfortable only when you lie towards the right. 3. Reflux gastritis: when suffering from reflux gastritis, because lying flat will cause acid reflux back into the esophagus, acid reflux, nausea, vomiting and other uncomfortable symptoms, sleeping and resting on the right side of the right side of the bed will alleviate the uncomfortable symptoms of reflux gastritis, so you can only lie on the right side of the bed, lying uncomfortable symptoms. 4. Thoracic spine small joint disorder: long-term use of the back to carry heavy objects, easy to lead to the small joints of the thoracic spine misalignment, and then activities will increase the friction between the joints and the surrounding tissues caused by the pain of the back, activities are limited, so that you can’t sleep lying down only on the side. In order to alleviate the situation of not being able to lie down in time, it is recommended to go to the orthopedic department of the hospital as soon as possible in order to make a clear diagnosis.