If a person is particularly susceptible to colds there are several factors as follows: 1. The body’s basic immunity is too low, because the body is susceptible to colds when the immunity is low by viruses, bacteria or other atypical pathogens, microorganisms, so colds can occur. 2. Colds are also likely to occur in cases of basic, primary illnesses, such as having underlying coronary atherosclerotic heart disease, or chronic pulmonary insufficiency. In particular, patients with chronic bronchitis, bronchiectasis, chronic obstructive pulmonary emphysema, chronic pulmonary heart disease, pulmonary hypertension, have a relatively poor respiratory mucosal barrier, so they are particularly susceptible to colds. 3, they are also particularly susceptible to colds in cases of extreme immune disorders, such as severe anemia or body tumors, AIDS, which can also lead to colds.