The body is always itchy for many reasons. The most common is some allergic skin diseases, such as allergic dermatitis and chronic urticaria, drug dermatitis, and papular urticaria caused by insect bites such as mites and mosquitoes. There are also some non allergic skin diseases, such as seborrheic dermatitis, neurodermatitis, etc., and some are dry skin of the elderly. Due to the reduction of secretion of sweat glands and sebaceous glands, the elderly skin itching may also occur. If the bile acid in pregnant women increases, it will also cause skin itching. When the body is always itchy, it is recommended to go to the dermatology department of a regular hospital in time to find out the cause and treat symptomatically.