So, how does pollen make people allergic? Generally speaking, the process is divided into two stages. In the first stage, when pollen enters the eyes, nose and lungs for the first time, it activates the immune system in the body, especially the allergic. At this time, their bodies secrete more than ten kinds of antibodies, which adhere to mast cells and 'Remember' their rejection of pollen. In the first stage, the human body is not allergic symptoms, the real allergic reaction is the second stage. When an allergic person comes into contact with the same kind of pollen again, the pollen meets and binds to the antibodies, and the mast cells begin to secrete a substance called histamine. Histamine molecules will swim to the eyes, nose and other receiving organs, causing blood vessels to swell, causing eye and nose congestion, itching, runny nose, sneezing and other allergic symptoms.
There are two kinds of cells in human body, namely mast cells and basophils. They are widely distributed in nasal mucosa, gastrointestinal mucosa, microvascular surrounding connective tissue of skin and capsule of internal organs. These two types of cells contain histamine, leukotriene, 5-hydroxytryptamine, jigging and other allergic mediators.