The difference between dry cough caused by neoconiosis and ordinary dry cough lies in the time of occurrence and the accompanying symptoms, which are described as follows: 1. 3, cough variant asthma: dry cough caused by cough variant asthma is heavier at night, accompanied by clinical symptoms such as nasal congestion, runny nose, sneezing, chest tightness and shortness of breath; 4, cardiac insufficiency: dry cough caused by cardiac insufficiency is accompanied by clinical symptoms such as discomfort in the precordial area and swelling of the lower limbs.