Abdominal breathing has no magical effect, and healthy people may use abdominal breathing as their main form of breathing; however, for patients with underlying lung diseases such as chronic obstructive pulmonary disease (COPD), abdominal breathing can help to increase lung capacity, and proper abdominal breathing training can help to improve diaphragm strength and improve lung function. During abdominal breathing, the diaphragm’s mobility is increased, which increases lung capacity to a certain extent compared to chest breathing, and patients with underlying lung diseases such as chronic obstructive pulmonary disease (COPD) may benefit from abdominal breathing. During abdominal breathing, the diaphragm can be exercised to a certain extent due to the increased movement of the diaphragm, which strengthens the diaphragm, so abdominal breathing training can also improve the patient’s lung function to a certain extent. Abdominal breathing is also effective in improving gastrointestinal function. Therefore, the role of abdominal breathing should not be over-exaggerated, but patients with chronic obstructive pulmonary disease and other diseases may have a certain effect on the condition of abdominal breathing, abdominal breathing training can be carried out moderately under the guidance of the doctor.