Besides the above, there are other theories one was that when Kenshin went to the lavatory he was killed with a spear by a murderer who was dispatched by Nobunaga, another strange theory that he died of women's disease (details are stated in Kenshin UESUGI was female), others are Kenshin died of gastric or esophageal cancer due to excessive drinking of sake, and that he was killed with arsenic poison by Nobunaga ODA are still other theories.
他に、厠で用を足していた時に信長の派遣で雪隠隠れをしていた刺客に槍で刺されて殺害されたという説、婦人病（詳細は上杉謙信女性説に記載）で亡くなったとという奇説や、酒の飲みすぎからくる胃癌、食道癌説、織田信長にヒ素で毒殺されたなどの説もある。