When the human body is deficient in pepsin, it can easily lead to the development of diseases such as chronic atrophic gastritis and functional gastric disease, which are characterized by nausea, vomiting, anorexia, loss of appetite, and maldigestion and malabsorption. Pepsin is a digestive protease of the human body, this enzyme is secreted in the form of zymogen particles, which are activated by hydrochloric acid in gastric juice, and has the ability to digest proteins in the stomach. In diseases such as chronic gastritis and chronic gastric dilatation, the amount of pepsin secreted is often reduced. Pepsin is often synergized with hydrochloric acid secretion, and if there is a deficiency of pepsin, hydrochloric acid secretion will be reduced, exacerbating the symptoms. If you find symptoms such as the above in your life, it is important to detect them in time and have them treated in a regular hospital in a timely manner.