This invention relates to a drug containing edible acid and/or acidic salt as active agent to treat and alleviate hypersensitivity diseases by lowering the humor pH and method； to improve individual hypersensitivity diseases by uses of health care food, which are made from said edible acid and/or acidic salt, or the acidic fruits containing thereof, or their products； foods lowering the risk of hypersensitivity and their preparation methods； drug to lower the humor acidity and to treat or alleviate disease caused by insects bite toxin； that also to be drug for cold or virus infection； drug for inflammation； drug for analgesic； and drug for thrombus disease； method lowers the hypersensitivity risk of clothing or grove and their products.
