The body is always itchy may be related to allergic skin diseases, infectious skin diseases, metabolic diseases, malignant diseases and so on. 1. Allergic diseases such as eczema, urticaria, atopic dermatitis, etc. lead to inflammatory skin reactions and itchy skin, and anti-allergic treatments such as oral cetirizine are good for relieving allergic itching. 2. Infectious diseases such as tinea pedis, lichen planus, scabies, etc. due to pathogenic infections can also cause recurrent itching of the skin, through active antifungal, anti-scabies treatment can be relieved. 3. Systemic metabolic diseases such as diabetes mellitus, hyperthyroidism, hypothyroidism, etc. will also appear repeated itching of the skin, through active treatment of the primary disease, in order to effectively alleviate itching of the skin. 4. The body is always itchy, but also highly alert to blood diseases, lymphoma, gastrointestinal cancer and other malignant tumors. When there is repeated itching of the skin, it is necessary to consult a doctor in a timely manner, under the guidance of the doctor to clarify the cause of the disease, reasonable treatment.