Why does the body itch?

Question 1: Why do people itch? Why does the skin of the person itch? (repost)

According to the report of Life Science in September 19, skin itching can make people feel nervous, so that patients can't help scratching the itchy place with their hands. Some people even scratch in their sleep. In severe cases, people will only feel pain.

Dermatitis is the chief culprit of skin itching. Dermatitis is a skin disease caused by laundry detergent, gold and other things that can skin. Martin, a neurophysiologist at Mannheim University in Germany? Schmercz said: "Because of itchy skin, the quality of life of patients has declined. When patients suffer the same pain as itching, they seem to be able to bear it, but itching makes them helpless. "

Nerves can make us feel annoying and stinging. Although some nerve fibers are mainly used to feel pain and touch, there are other nerve fibers in the human body that specially feel itching. Protein —— Histamine secreted by human allergic reaction innervates some itchy nerves to transmit information to the spinal cord, and the information is processed in the spinal cord and fed back to the brain.

The areas in the brain that are activated during itching are very similar to those that are activated when we are in pain. Antihistamines can work by eliminating histamine's ability to send signals. However, histamine is not the only chemical in the human body that causes itching. About ten years ago, Schmeltz first discovered nerve fibers sensitive to itching. Recently, he discovered the existence of a new nerve fiber. Schmercz said, "Obviously, more than one nerve fiber itches. We have found a lot of information about histamine-sensitive itching fibers, and we are currently studying new itching fibers. This result may help to explain the causes of chronic pruritus more comprehensively. "

Itching is a precursor to many diseases. In fact, itching can be caused by contact with plants, animals and metal substances. Weather changes, bacteria, diseases and parasites can also affect itching, and stress can make itching worse.

Question 2: How is the body itching after bathing? Analysis of the condition: the treatment of skin itching is mainly composed of calming and relieving itching in western medicine. If the skin is dry and itchy, remember not to scratch the affected area, so as not to scratch more and more, which will expand the scope. Maybe everyone has had this experience. Sometimes, when you walk from a cold outdoor to a warm indoor, or take off your thick coat and lie on the bed before going to bed at night, the skin will suddenly itch and you can't help scratching, but often the more you scratch, the more you scratch, the more you itch, and the more you scratch, the more you itch, forming a vicious circle. Moreover, scratching is likely to damage the skin and strengthen the skin's response ability. If you grasp it too hard, it may cause dermatitis or leave pigmentation and lichenoid sclerosis on the skin, which will be more difficult to treat. So many times, if the itching is not very serious, try to endure it. Don't scratch casually. You can use some moisturizing things for dry and itchy parts. If itching is serious, you can also apply some antipruritic ointment/liquid medicine containing mint and other cool ingredients (such as calamine lotion, Saigeng cream, triamcinolone acetonide ointment, etc.). ) to relieve symptoms and make the skin gradually return to normal; Or local cold compress with a towel soaked in cold water can also relieve the symptoms of itchy skin. For oral medication, people with dry skin can take cod liver oil pills three times a day. Instruction: Take one pill at a time. Oral multivitamins (such as Shierkang and Shancun tablets) and calcium tablets also have a certain auxiliary effect on the treatment of itching. When there are common itching symptoms, you can take sitamin and cetirizine without sedation during the day, and take chlorpheniramine, cyproheptadine and other antihistamines with sedation half an hour before going to bed at night. If the whole body itches, you can take anti-allergic drugs such as phenanthrene or cyproheptadine to relieve symptoms. , view the original post >>

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Question 3: Why does the body itch for no reason? The main consideration is neurodermatitis. It is recommended to go to a dermatological examination, but you can take anti-inflammatory and anti-allergic drugs for treatment.

Question 4: Why does the skin itch? Experts pointed out that the main causes of skin itching are internal and external causes, among which the internal causes are mainly nervous system diseases, visceral diseases and endocrine disorders. Clinically, it is found that cerebral arteriosclerosis, spinal tuberculosis and neurasthenia can also cause systemic or local skin itching. Clinically, neurosis patients often have some hallucinations, thinking that there are insects in the skin and feel itchy, and some will develop the habit of scratching. In addition, patients with functional or organic diseases such as stomach, intestine, liver and kidney, especially those with diabetes, uremia and liver disease, often feel itchy all over; Some tumor patients, such as leukemia, lymphosarcoma, Hodgkin's disease, mycosis fungoides and malignant lymphoma, will have itchy skin. Endocrine itching is very common. Some women often have itching during pregnancy and generally disappear after delivery. Menstrual disorders or ovarian diseases often cause vulvar itching. Skin itching in the elderly may be related to the decrease of sex hormone levels in the body. Patients with thyroid diseases may have itching. In addition to internal causes, skin itching also has external causes. Generally speaking, skin itching can cause systemic or local itching. Changes in temperature often cause skin itching, and patients with itching in winter and summer are extremely sensitive to climate change. The bedding is too hot, and sudden heating or cooling may cause itching. In addition, mechanical friction or physical and chemical factors are also one of the causes of skin itching. If disinfectants, pesticides, deodorants, dyes and other substances are used, local skin itching can be caused.

Question 5: What is itching? It may be cholinergic urticaria, which belongs to a rash that people often say. When heated, nervous, eating hot food or drink, or exercising, the body temperature rises slightly, and the heated blood flow excites cholinergic nerves and releases acetylcholine. If you are allergic to this chemical, you may have an allergic reaction.

This allergic reaction has no rash, only acupuncture and severe itching, and red wind masses of about 2 mm can also appear on the skin near the trunk and limbs (except armpits, palms and soles). This kind of wind mass comes quickly and leaves no trace. Ordinary people may have mild cholinergic urticaria in adolescence. Generally, after stopping exercise or calming down, the symptoms can subside, so it is not easy to attract attention. The whole process can last for months to years, and those who have frequent attacks should go to dermatology for treatment in time. After treatment with antihistamines and anticholinergic drugs, the condition can be alleviated or alleviated.

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Finding out the cause and removing the pathogenic factors is the way to cure the problem. But the cause of urticaria, especially chronic urticaria, is often difficult to find, so symptomatic treatment is often used in most cases. People who can't get rid of the disease should reduce various triggering factors, especially physical urticaria. At the same time, we should pay attention to avoid various factors that aggravate skin vasodilation. Can give

1. antihistamines: mainly H 1 receptor antagonists and H2 receptor antagonists. Various antihistamines have different antihistamines and other pharmacological effects. For example, cyproheptadine is effective for cold urticaria, and Antaile is effective for hot urticaria. For intractable urticaria, H 1 and H2 receptor antagonists can be combined to improve the curative effect.

2. Adrenal cortical hormone: used in acute severe or intractable cases, such as anaphylactic shock, serous urticaria, stress urticaria, etc. Hydrocortisone 100~200MG is added into 5% glucose solution for intravenous drip, or 30~40MG of prednisone is taken orally. This therapy is generally not suitable for long-term application.

3. Antibiotics: Those who are infected can choose appropriate antibiotics, especially urticaria caused by obvious or concealed gastrointestinal infections.

4. Drugs that reduce vascular wall permeability: such as vitamin C, vitamin P, calcium, etc. Often used with antihistamines.

5. Sympathomimetic drugs: mainly used for severe acute urticaria's disease, especially when there is anaphylactic shock or laryngeal edema. Subcutaneous injection of 0. 1% epinephrine 0.5~ 1 ml. In severe cases, it can be injected again every 20 to 30 minutes.

6. Histamine globulin: It is a drug that promotes the production of antihistamine antibodies in the body, and has a good effect on chronic urticaria, especially mechanical and cold urticaria. 2~4 ml intramuscular injection each time, 65438+ 0~2 times a week, 6~8 times as a course of treatment.

7. Others: oral vitamin K, vitamin E, vitamin B 12, aminophylline, reserpine, chloroquine, intravenous aprotinin, 6- aminohexyl, sodium thiosulfate, heart and tissue therapy, autologous blood therapy, etc.

Question 6: Why do I feel itchy? Are there any animals in your house? Maybe you are allergic to animals.

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