allergic urticaria
Introduction
Introduction to allergic urticaria Urticaria, commonly known as rubella, is a limited edema reaction due to skin and mucosal small blood vessels dilating and increasing permeability. The clinical manifestations of rubella block damage of varying sizes suddenly occurred, rapidly subsided, itching was severe, and no trace was left after the recovery. basic knowledge The proportion of illness: 0.001% Susceptible people: no specific population Mode of infection: non-infectious Complications: anaphylactic shock
Cause
Cause of allergic urticaria
1. Animal and plant factors, such as insect bites or inhalation of feathers, pollen, dander, etc.
2. Food is most common with crabs, fish, shrimps and eggs. Followed by a spice seasoning can also be caused.
3. Infection: including viruses (such as susceptible viruses, hepatitis viruses), bacteria (such as golden grapes), fungi and parasites (such as aphids).
4. Physical factors such as sunlight, heat, friction and pressure can be caused. In addition, metabolic disorders, gastrointestinal disorders, endocrine disorders and mental factors can also be caused.
5, there are many drugs that can cause the disease. Sulfamides, penicillins, serum vaccines, quercetin, etc., often cause urticaria through immune mechanisms. The drugs such as morphine, aspirin, vitamin B1 and atropine are histamine-releasing substances, which can directly cause histamine to release urticaria from mast cells.
Prevention
Allergic urticaria prevention
1, pay attention to diet conditioning
Balance nutrition, eat more vitamins and vegetables such as fruits and vegetables. Vitamin C is a natural antihistamine, which should be taken from the food you eat. Avoid eating spicy and irritating foods. Even hot pot barbecues that produce large amounts of calories can't be eaten. To avoid this disease, you have to prevent it.
2, away from sensitization factors
This is the most fundamental factor and method to prevent allergic skin diseases. Always maintain indoor sanitation such as window ventilation, maintain proper temperature and humidity, minimize the use of disinfectant insecticides, etc.; also minimize contact with pollen in spring, avoid direct sunlight in summer, try to avoid contact with pet dogs, and change clothes frequently.
Complication
Allergic urticaria complications Complications anaphylactic shock
People with severe allergic urticaria may have symptoms of anaphylactic shock such as palpitation, irritability, nausea, vomiting, and even lower blood pressure.
Some patients may involve mucosal edema in the gastrointestinal tract. At the same time of the occurrence of wheal, abdominal pain, sometimes very intense, is similar to acute abdomen; diarrhea can also occur, accompanied by urgency and heavy mucus.
If you involve the mucous membrane of the throat, you may have difficulty breathing or even suffocation. Such as accompanied by high fever, cold war pulse speed and other symptoms of systemic poisoning, should be especially alert to the possibility of serious infections such as sepsis.
Symptom
Allergic urticaria symptoms Common symptoms Itching wheal erythema nodules
The urticaria caused by allergies is usually often anxious, sudden itching, and soon there are bright red whistles of varying sizes, which are round, oval or irregular, scattered and scattered, and can also be fused into pieces. However, if the blood vessels in the microvessels are drastically exuded, the wall of the tube is pressed, and the symptoms of allergic urticaria can be pale and the surface pores are as orange peel. The edema is reduced within a few hours, and the wind becomes erythema and disappears. However, new wheals have occurred one after another, and this may occur many times within a day.
Experts pointed out that patients with severe illness may have symptoms of anaphylactic shock such as palpitation, irritability, nausea, vomiting, and even lower blood pressure. Some patients with allergic urticaria may affect mucosal edema caused by the gastrointestinal tract. Sometimes it is very intense, quite like acute abdomen; diarrhea can also occur, accompanied by urgency and mucus and loose stools. If it involves the mucous membrane of the throat, it may have difficulty breathing or even suffocation. Symptoms of allergic urticaria such as high fever and chills If you have symptoms of systemic poisoning, you should be especially alert to the possibility of serious infections such as sepsis.
Examine
Allergic urticaria examination
Blood test, skin test, skin patch test.
Diagnosis
Diagnosis of allergic urticaria
1, suspected to be related to infection, or a history of hepatitis in the liver or medical history at the time of physical examination, feasible blood routine, hepatitis B antigen, antibody examination, stool eggs, fungi, X-ray examination of the lesions.
2, for cold urticaria should check the syphilis serum test, determination of cold globulin, cold fibrinogen, cold hemolysin and ice test, anti-nuclear antibodies and other tests.
3. If you suspect that you are inhaled or have allergies, you should take an allergen test. If it is positive, you can take desensitization treatment.
4, allergic urticaria examination: patients with serum urticaria have fever and joint pain, should check the blood sedimentation, such as normal erythrocyte sedimentation rate has important diagnostic value.
