Itching all over the body on rainy days may be related to contact with allergens, seasonally sensitive skin, cold urticaria and other factors. 1. Contact with allergens: The weather is humid on rainy days, so if you contact, inhale or ingest allergy-inducing substances, it may lead to itchy skin all over the body. 2. Seasonally sensitive skin: Skin with a thin stratum corneum or seasonally sensitive skin with poor skin tolerance may show symptoms of itchy skin on rainy days. 3. Cold urticaria: patients with allergies are allergic to cold and wet, and lower temperatures on rainy days may cause cold urticaria, resulting in the appearance of rubella, accompanied by a pronounced itching sensation. It is recommended to find and get rid of the allergens, if necessary, go to the hospital dermatology department, under the guidance of the doctor to give loratadine, imipramine and other drugs, the effect is better.