Chicken chest is an acquired disease, the specific causes are as follows: 1, and calcium and phosphorus metabolism disorders, part of the chicken chest and nutritional vitamin D deficiency rickets; 2, and repeated chronic respiratory infections, long-term chronic respiratory infections can lead to reduced compliance of lung tissue, while the diaphragm movement is enhanced, pulling the Hao’s sulcus invagination gradually formed chicken chest deformity; 3, congenital heart disease after open-heart surgery or other chest surgery can occur chicken chest; 4, some adolescent children due to steep growth and development, the body vitamin D storage deficiency led to the emergence of chicken chest.