The following causes are common in adults: 1. congenital developmental deformities of the rib cage: mainly related to rickets caused by lack of vitamin D and lack of calcium and phosphorus in adolescence, the patient will exhibit rib exostosis and deformity. 2. osteochondrosis: lack of vitamin D and calcium in adulthood, lack of sunlight, and impaired absorption of vitamin D and calcium in the gastrointestinal tract will also cause a decrease in bone density throughout the body, resulting in rickets in adults. Resulting in rickets in adults, the patient will manifest as rib exostosis and deformity. After active exercise, the rib cage can be eased to a certain extent. Patients should pay attention to calcium and vitamin D supplementation, more sunlight, and moderate exercise to avoid rib exostosis. It is also possible to strengthen the abdominal and thoracic muscles to correct rib ectropion and deformity.