I. Allergenic pollen characteristics.
1.Small flowers;
2.Small pollen grains;
3.High pollen production (yellow rain);
4.The plant is highly adaptable;
5.Not brightly colored;
6, does not contain nectar;
7, not fragrant, some have a bad smell;
8, light floating 800 km, more than 10,000 meters;
9. Longer pollination period; Sneakers Part of the pollen has air sacs
Second, the characteristics of hay fever.
Infants are rare Male > female; mostly seen in young and middle-aged 20-39 73%; respiratory symptoms nose > lung; itchy eyes, ears, pharynx, palate; symptoms are heavier on sunny days when it is extremely windy and lessened when it rains; rash itchy skin, mostly in exposed areas. There are obvious regional, seasonal (such as spring or autumn), climatic effects.
Three, hay fever diagnosis
1. Seasonal distinctness
2. Prominent respiratory symptoms
3. Distinctive regional sunglasses Skin test: intradermal, prick
4. Conjunctival test
5. Nasal mucosal excitation and bronchial excitation
6. In vitro specific tests;
IV. Differential diagnosis
Molds, mites, insects, pesticides, seasonal foods, fruits and vegetables.