Allergic reaction

An allergic reaction is a reaction that occurs when an immune body is stimulated by the same substance again. The response is characterized by rapid onset, strong response, and rapid regression, with obvious genetic tendencies and individual differences. People often see such phenomena in life. After eating food such as fish and shrimp, some people will experience abdominal pain, diarrhea, vomiting, or itchy skin. Some people may inhale pollen or dust, and rhinitis or Asthma; some people experience shock after penicillin injection. These are all signs of an allergic reaction. allergy