When the body encounters an allergen, the immune system will produce a series of reactions; immune cells will produce a large amount of specific immunoglobulin (Specific IgE, referred to as IgE). When mast cells encounter this IgE and receive specific stimulation, they will release inflammatory substances such as histamine, prostaglandin, and leukotriene. These substances can cause allergic symptoms: such as skin rash, redness and swelling, asthma, etc. If the allergic reaction is severe, the trachea may swell, causing difficulty in breathing and life-threatening.

The best way is to avoid or reduce exposure to allergens. Pay attention to how to avoid exposure in daily life. For example: pay attention to the ingredients of food and drinks, clean with hot water frequently and change bed clothes frequently, etc.

IgE allergic reactions generally occur hours to days after exposure to allergens. Skin symptoms include: itchy skin, eczema, urticaria (rheumatism/rheumatism), rash, nasal allergy, asthma, abdominal pain, diarrhea, etc. . In severe cases, it may even cause breathing difficulty and a drop in blood pressure, leading to life-threatening consequences.

No. Blood testing can be done at any time, or during an allergy attack (the best timing).