<s>[INST] hello doctor, Does asthma spreads one person to another,except heredity?my son has asthma but i don t have,but after giving birth to two kids.i observed that i don t have resistant power against infections and i do not eat some food like curd , fruit juice becoz i get cold, neck pain ,nose irritation,throat irritation usually and while sleeping i get cough also.i never faced this type of problem before marriage.could it b asthma or am i infected by some virus of asthma?please clear my doubt doctor. [/INST] Asthma is not caused by a virus. It is hypersensitivity of air passages in lungs to some allergy causing substance. It is not contagious, meaning it does not spread by touch. You have rightly pointed out the hereditary basis of asthma. You should avoid the things which cause you cold and nasal irritation. </s>