1.Symptoms: Most children with funnel chest have shallow depressions on their chest at birth or soon after birth, and most of them are obvious at the fenestra. With age, the depression generally deepens progressively during infancy and preschool. It basically stabilizes during school age. However, there are a few children with late onset of thoracic depression, and the progressive increase with rapid physical development during school age and even adolescence. Due to the compression of the depressed chest wall on the heart and lungs, gas exchange is restricted and secretions are easily retained in the lungs, so upper respiratory tract infections often occur, and sometimes shortness of breath occurs after activity. Low food intake and wasting. Most children with funnel chest are too young to express conscious symptoms, and because of the elasticity of the chest wall and their limited physical strength, they often fail to show symptoms such as shortness of breath after exercise and significantly lower exercise volume compared to their peers, so that the chest wall deformity is not corrected even after adulthood, and they do not realize the need for treatment until they develop conscious symptoms, changes in cardiopulmonary function and psychological problems. Some patients may experience fatigue, shortness of breath, palpitations or tachycardia after mild activity, and some patients may have sharp pain in the anterior chest and pressure discomfort. 2.Signs: Most of the patients with funnel chest have a long and thin body shape, most commonly with symmetrical or asymmetrical depression in the lower 3/4 of the sternum, most of them have anterior chest concavity, posterior back arch, double shoulders, and abdominal expansion. Some children also have pectoral dysplasia, flat chest and forked ribs. Once parents find out that their children have problems with chest development, they should seek medical consultation and early diagnosis and treatment to avoid adverse effects on the growth and development of children.