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In page Tokugawa Ieyasu:

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He was first given the Buddhist name Tosho Dai-Gongen (東照大權現), then, after his death, it was changed to Hogo Onkokuin (法號安國院).[citation needed] During this time, the chief physician who cared for him, Sotetsu Katayama, diagnosed Ieyasu with stomach cancer. However, Ieyasu misinterpreted Katayama's diagnosis of his illness as a tapeworm infestation. Thus, he did not take the medicine Sotetsu had prepared, and instead continued his own method of therapy which he believed could cure his perceived tapeworm problem. This resulted in Ieyasu's health continually deteriorating.