Why do I feel itchy?

Question 1: Why do people itch? Why do people’s skin itch? (Repost)

According to a report in "Life Science" on September 19, skin itching can irritate nerves, making patients unable to help but scratch the itchy areas with their hands. Some people even do this in their sleep. It will scratch everywhere, and when it is severe, it makes people feel like they are in unbearable pain.

A major culprit of itchy skin is dermatitis, a skin disease caused by things like laundry detergents and gold that can irritate the skin. Martin Schmelz, a neurophysiologist at the University of Mannheim in Germany, said: "Patients' quality of life is reduced due to itchy skin. When patients suffer from pain of the same level as itching, they seem to be able to tolerate it, but the itching makes them suffer. There's nothing they can do about it. ”

Nerves can give us annoying, tingling sensations. Although some nerve fibers are primarily used to sense pain and touch, there are other nerve fibers in the body that are specialized for feeling itchiness. Histamine, a protein secreted by the human body during allergic reactions, controls some itchy nerves to transmit information to the spinal cord. After the information is processed in the spinal cord, it is fed back to the brain.

The areas of the brain that are activated when we itch are very similar to the areas that are activated when we experience pain. Antihistamines work by eliminating histamine's ability to send signals. However, histamine is not the only chemical in the body that can cause itching. Schmelz first discovered nerve fibers sensitive to itch almost a decade ago. Recently, he discovered the existence of a new nerve fiber, Schmelz said: "Clearly, there is more than one nerve fiber *** itch. We found a lot of information about histamine-sensitive itch fibers, and now New types of itch fibers are being investigated, and the results may help to more fully explain the causes of chronic itching disorders. ”

Itch is a precursor to a wide range of conditions. In fact, itching can be triggered by reactions to exposure to plants, animals, and metallic substances. Weather changes, bacteria, disease, and parasites can also affect itching, and stress can make it worse.

Question 2: Why does my body feel itchy after taking a shower? Condition analysis: For the treatment of skin itching, Western medicine mainly focuses on sedation and relieving itching. If the skin is already dry and itchy, remember not to scratch the affected area, otherwise it will make it more itchy and expand the area. Maybe you have had this experience. Sometimes when you go from a cold outdoor to a warm indoor, or when you take off your thick coat and lie in bed before going to bed at night, you feel a sudden change of temperature between cold and hot. * The skin will suddenly feel itchy for a while, and you can't help but scratch it. However, the more it itches, the more you scratch it, and the more you scratch it, the more it itches. The more you scratch it, the more serious the itching becomes, creating a vicious cycle. And scratching is likely to damage the skin and increase the skin's reactivity. If you scratch too hard, it may cause dermatitis or leave pigmentation and lichen-like hardening of the skin, which will make treatment more difficult. Therefore, in many cases, if the itching is not serious, try to endure it and do not scratch it casually. You can use some moisturizing products on the dry and itchy areas. If the itching is severe, you can also locally apply some anti-itch ointments/potions with cooling ingredients such as mint (such as calamine lotion, cyheptadine cream, triamcinolone urea ointment, etc.) to relieve symptoms and allow the skin to gradually recover. Normal; or applying local cold compress with a towel soaked in cold water can also relieve the symptoms of itchy skin. In terms of oral medicine, people with dry skin can take cod liver oil pills three times a day. The guidance is: one pill each time. Oral administration of multivitamins (such as Shierkang, Shancun tablets), calcium tablets, etc. also has a certain auxiliary effect on the treatment of itching. When ordinary itching symptoms occur, you can take non-sedative astamine, cetirizine, etc. during the day, and take sedative antihistamine drugs such as chlorpheniramine, cyproheptadine, etc. half an hour before going to bed at night. If itching all over the body is unbearable, you can take anti-allergic drugs such as phenergan or cyproheptadine to relieve symptoms. , View original post >>

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Question 3: Why does my body feel itchy for no reason? It is mainly caused by neurodermatitis. It is recommended to go to a dermatologist for examination. , can be treated with anti-inflammatory and anti-allergic drugs.

Question 4: Why does skin itching occur? Experts point out that the causes of skin itching are mainly divided into two categories: internal and external. The internal causes are mainly neuropsychiatric system disorders, visceral diseases, and endocrine disorders. Clinical findings include cerebral arteriosclerosis, tuberculosis, and neurasthenia, which can also cause systemic or localized skin itching. In clinical practice, it is common for patients with neurosis to have some kind of hallucination, thinking that there are insects in their skin and feeling itchy, and some develop the habit of scratching. In addition, patients with functional or organic diseases of the stomach, intestines, liver, kidneys and other internal organs, especially patients with diabetes, uremia, and liver disease, often experience widespread itching throughout the body; certain tumors such as leukemia, lymphosarcoma, Patients with Hodgkin's disease, mycosis fungoides, and malignant lymphoma develop skin itching. Skin itching caused by endocrine is very common. Some women often have pruritus during pregnancy, which usually disappears after delivery. Menstrual disorders or ovarian diseases often cause vulvar pruritus. Itchy skin in the elderly may be related to reduced levels of sex hormones in the body. People with thyroid disease can experience pruritus. In addition to internal causes, skin itching also has external factors at play. Generally speaking, skin itching can cause generalized or localized itching.

Changes in temperature often cause itching of the skin, and patients with winter pruritus and summer pruritus are extremely sensitive to climate changes. Bedding that is too hot, sudden heat or cold may cause itching. In addition, mechanical friction or physical and chemical factors are also one of the causes of skin itching. If you use disinfectants, insecticides, deodorants, dyes and other chemicals, they can make the skin itchy.

Question 5: Why is it itchy? It may be cholinergic urticaria, which is a type of wheal that people often call. When exposed to heat, mental stress, ingestion of hot food or drinks, or after exercise, the body temperature increases slightly, and the increased blood flow stimulates the brain's temperature regulation center, excitating cholinergic nerves and releasing acetylcholine. Chemical allergies can cause allergic reactions.

In addition to no rash, only acupuncture and severe itching, this type of allergic reaction can also cause red wheals of about 2 mm to appear on the skin of the trunk and proximal limbs (except axilla, palms and soles). , this kind of wind mass comes and goes quickly without leaving any trace. Mild cholinergic urticaria can occur in ordinary people during adolescence. The symptoms usually subside after stopping exercise or calming down, so it is not easy to attract attention. The whole process can take months or years. Those with frequent attacks should go to a dermatologist for diagnosis and treatment in time. After treatment with antihistamines and antiacetylcholine drugs, the condition can be alleviated or alleviated.

Treatment

Finding out the cause and removing the factors are the fundamental cures for the disease. However, the cause of urticaria, especially the cause of chronic urticaria, is often difficult to discover, so symptomatic treatment is usually given in most cases. For those cases where the disease cannot be eliminated, various precipitating factors should be reduced, especially in cases of physical urticaria. At the same time, attention should be paid to avoiding various factors that aggravate skin blood vessel dilation. Can be given

1. Antihistamine drugs: There are mainly H1 receptor antagonists and H2 receptor antagonists. The antihistamine effects of various antihistamine drugs are different from each other in degree, and Their other pharmacological effects are also different from each other; for example, cyproheptadine is effective for cold urticaria, Antalor is effective for thermal urticaria, and H1 and H2 receptor antagonists can be combined for refractory urticaria to improve the effectiveness of the treatment. Efficacy.

2. Adrenocortical hormone: For acute severe or stubborn cases, such as anaphylactic shock, serum sickness urticaria, pressure urticaria, etc., hydrocortisone 100~200MG can be added to 5% glucose solution Intravenous infusion, or oral administration of 30 to 40 mg of prednisone. This therapy is generally not suitable for long-term use.

3. Antibiotics: Appropriate antibiotics can be used for those caused by infection, especially for urticaria caused by obvious or latent infection of the gastrointestinal tract.

4. Drugs that reduce the permeability of blood vessel walls: such as vitamin C, vitamin P, and calcium. Often used together with antihistamines.

5. Sympathomimetic drugs: mainly used for severe acute urticaria, especially when there is anaphylactic shock or laryngeal edema. Use 0.5 to 1 ml of 0.1% epinephrine for subcutaneous injection. In severe cases, another injection can be given every 20 to 30 minutes.

6. Histamine globulin: It is a drug that promotes the production of antihistamine antibodies in the body. It has a better effect on chronic urticaria, especially on mechanical and cold urticaria. Inject 2 to 4 ml intramuscularly each time, 1 to 2 times a week, and 6 to 8 times constitute a course of treatment.

7. Others: You can choose vitamin K, vitamin E, vitamin B12, aminophylline, reserpine, chloroquine, etc. orally, aprotinin, 6-aminohexacin, sodium thiosulfate intravenously, Cardiac and tissue therapy, autohemotherapy, etc.

Question 6: Why do I feel itchy? Do you have animals at home? Maybe you are allergic to animals.

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