This is the least desirable form of breathing since the upper lobes of the lungs are used and these have only a small air capacity. Also the upper rib cage is fairly rigid, so not much expansion of the ribs can take place. A great deal of muscular energy is expended in pressing against the diaphragm and in keeping the ribs and shoulders raised abnormally high. This form of breathing is quite common, especially among women, probably because they often wear tight clothes around the waist which prevents the far superior abdominal breathing. It's a common cause of digestive, stomach, constipation and gynecological problems.
Low breathing refers to what takes place primarily in the lower part of the chest and lungs.
It is far more effective than high or mid breathing. It consists mainly in moving the abdomen in and out and in changing the position of the diaphragm through such movements. Sedentary persons who habitually bend forward while they read or write tend to slump into low breathing. Whenever one slouches or slackens his shoulder and chest muscles, he normally adopts low breathing. We often use low breathing when sleeping.