Itchy body in winter into the blanket may be cholinergic urticaria, allergies and other causes. 1. Cholinergic urticaria: when entering the quilt in winter, the skin temperature will rise, prompting the cholinergic nerves to release a large amount of acetylcholine, which triggered cholinergic urticaria, manifested as tiny air masses on the surface of the skin, accompanied by intense itching, numbness, or burning sensation. 2. Allergy: allergy-prone people, when the body comes into contact with certain allergens, it is possible to induce an allergic reaction, if the patient’s allergens for the bedding, sheets, covers, etc., the winter into the quilt, the contact with the allergens will make the skin surface erythema, pimples, etc., accompanied by varying degrees of itchiness, redness and swelling, and other symptoms. There may be other causes of itchy body in winter, it is recommended to go to the hospital in time to improve the examination, to clarify the cause of the disease to give targeted treatment.