A method for prevention or therapy of pollen allergy, allergic rhinitis, atopic dermatitis, asthma or urticaria by administration of two kinds of crude drugs--seeds of Cucurbita moschata and flowers of Carthamus tinctorius--and at least one crude drug selected from Plantago asiatica, Lonicera japonica, Glycyrrhiza uralensis, Coix lachrymal-jobi var. ma-yuen, Zingiber officinale, Curcuma longa, Curcuma zedoaria and Artemisia argyi to a patient; and a health food for prevention, or improvement, or reduction of these symptoms containing the above substances.