Chicken chest is mainly due to rickets, caused by prolonged calcium deficiency, which will cause a series of clinical symptoms, mainly including thoracic deformity, cardiac function abnormality and lung function abnormality. 1. Thoracic deformity: Generally, chicken chest is mainly manifested as thoracic deformity, rib cage collapsing, sternal stem anteriorly convex, sternal body concave, rib cage edges are not smooth. 2. Abnormal heart function: chicken breast will press the heart, causing abnormal heart beat, affecting blood supply and leading to weakness. 3. Abnormal lung function: Thoracic deformity leads to decreased lung mobility, causing shortness of breath due to restricted breathing. In addition to the above main symptoms, there will be other signs of calcium deficiency, such as growth retardation, body wasting and so on. If you find the condition of chicken chest, you need to seek medical observation in time and standardize the treatment under the guidance of clinicians.