Dry mouth, chest tightness and shortness of breath are divided into physiological and pathological, pathological causes are cardiovascular disease, respiratory disease and endocrine disease. 1. Physiological: If you have just finished a strenuous exercise, or emotional fluctuations, you will have a dry mouth, chest tightness and shortness of breath, which is a normal physiological phenomenon, a good rest or calm your emotions can be restored to normal, without additional special treatment. 2. Pathological: If you suffer from cardiovascular diseases, such as angina pectoris, hypertension and heart valve disease, you will have this symptom because of the decline in the blood supply function of the heart; there are also respiratory diseases such as chronic obstructive pulmonary disease, asthma, and bronchiectasis, etc., which will produce this symptom due to the decline in ventilation; as well as endocrine diseases will produce this symptom due to the rise in hormones, such as hyperthyroidism. If you suspect that the clinical manifestations are due to a pathologic cause, it is recommended that you seek medical attention promptly.