A high chest may be caused by heart disease, rickets, pleural effusion and other factors. 1. Heart disease: heart enlargement caused by various organic diseases, like heart enlargement, hypertrophy, like congenital heart disease, rheumatic heart disease, dilated heart disease can cause chest high up. 2. Rickets: generally due to the lack of vitamin D in the body, resulting in insufficient absorption of calcium and phosphorus, resulting in insufficient development of the chest cavity, which in turn leads to the phenomenon of high chest cavity. 3. Pleural effusion: it may be due to the occurrence of inflammatory lesions in the pleura, which will lead to the emergence of more inflammatory secretion exudation in the pleural cavity, the secretion will gradually accumulate in the pleural cavity, which will lead to the occurrence of pleural effusion, resulting in the phenomenon of high chest cavity. If the phenomenon of high chest cavity, you should go to the hospital for consultation in time, so as not to delay the condition and discomfort.