Medical diagnosis based on intuitionistic fuzzy sets revisited

This paper is a response to the paper by De, Biswas, and Roy that was published in Fuzzy Sets and Systems, 2001, 209-213. They considered an application of intuitionistic fuzzy sets in medical diagnosis. Recently, a lot of papers have cited the paper to apply in medical field. However, this paper will point out that their approach contains questionable results that may lead to false diagnosis of patients' symptoms. Consequently, we advise researchers and physicians not to apply their approach to avoid risk to human life.