There are many reasons for the sudden increase of H. pylori, such as decreased immunity, family aggregation, and others, and it is recommended to go to the hospital for examination. 1. Decreased immunity: When H. pylori invades the body, the immune system cannot completely remove H. pylori, and it can continue to multiply to a certain extent. 2. Family aggregation: H. pylori is mainly transmitted through the oral-oral route, if someone in the family is infected with H. pylori, other members of the family are also susceptible to infection, both parents are positive for H. pylori, and their children are more likely to be infected. In addition, people who eat out for long periods of time are also susceptible to infection because they are in contact with people who are infected with H. pylori. 3. Other: the infection rate of H. pylori is related to age, the older the age, the higher the infection rate; long-term heavy oil and salt, smoking, eating pickled vegetables, etc. also easily lead to a decline in the sensitivity to H. pylori.