Abstract: The purpose of the present paper is to classify among different age group of the patients and their symptoms of breast cancer through the mammographic images under single dieses and to determine appropriate therapeutic action. This also helps to diagnosis of diseases which having the same symptoms. This paper deals with knowledge based expert systems which have been developed for the diagnosis of diseases based on the symptoms obtained from the interaction and observation from the patient. The diagnoses are vague or uncertain for the treatment so there is a requirement of fuzzy. An example of Brest Cancer and other group of diseases is taken where the retaliated diagnosis is approach to fuzzy logic.