There is a theory that the cause of his death was Hansen's disease and it is said that many visited Kato-jinja Shrine dedicated to Kiyomasa to pray for their recovery from illness in the ages when there were many patients.
また死因はハンセン病（癩病、ハンセン病）であったとする説もあり、罹患者の多かった時代には清正を祀る加藤神社に平癒を願う参詣者が多かったという。