Why does the skin itch

Itchy skin is a relatively common symptom. Of course, this symptom has a relatively large impact on patients, because itching not only causes the skin to be scratched, causing wounds or red marks, but also greatly affects a person's mental state. Therefore, when skin itching occurs, it is important to find out the cause and treat it in time. Below, I will introduce you to the relevant knowledge about skin itching!

1. Skin itching for no reason

The causes of skin itching are complex. It can be divided into two aspects: external factors and internal factors. Internal factors include systemic diseases, such as endocrine diseases (diabetes, hyperthyroidism, carcinoid syndrome, etc.), hepatobiliary diseases (primary biliary cirrhosis, biliary obstruction, etc.), kidney diseases (chronic renal failure, chronic hemodialysis disease), blood diseases (iron deficiency anemia, polycythemia vera, etc.), malignant tumors (lymphoma, leukemia, etc.), neurological diseases (spinal cord disease, paralytic dementia, etc.), infectious diseases (AIDS, tuberculosis, filariasis, etc.), etc. External factors are related to physical (fever, cold, etc.), mechanical (friction, etc.), chemical stimulation (acids and alkalis, etc.), food (spicy food), and drugs (belladonna, cimetidine, chloroquine, etc.).

2. What causes skin to itch for no reason?

What pruritus has in common with eczema, neurodermatitis, pediculosis, scabies and other diseases is that they all cause relatively severe itching, but the most basic difference is that the former has no primary skin, while the latter does. Moreover, adult lice or eggs can be found in lice, while scabies is more common in some special parts such as between fingers, with characteristic tunnels, scabies nodules, and collective infection, where scabies or eggs can be found.

III. Systemic treatment of pruritus

(1) Oral or injection of antihistamines, 5-HT antagonists and sedatives. Such as chlorpheniramine (chlorpheniramine), diphenhydramine, cyproheptadine, cetirizine, astemizole, terfenadine, loratadine, cimetidine (cimetidine), ranitidine, diazepam (Valium), etc. These drugs can be selected according to the condition. H2 receptor antagonists alone have a certain effect on the pruritus caused by Hodgkin's disease and polycythemia.

(2) For patients with severe itching, 10% calcium gluconate can be injected intravenously or 0.25% procaine hydrochloride and 1.0-2.0g of vitamin C can be added to 500ml of normal saline or compound sodium chloride solution and dripped intravenously. Naloxone can be used for patients with intractable pruritus, but it is potentially addictive.

(3) For menopausal or elderly pruritus, male patients can choose to use testosterone propionate 50 mg intramuscular injection 2 to 3 times a week, or nandrolone phenylpropionate tablets 25 to 50 mg intramuscular injection 2 to 3 times a week; female patients can take diethylstilbestrol 1 mg orally once a day.