Alma 15:3

And also Zeezrom lay sick at Sidom, with a burning fever, which was caused by the great tribulations of his mind, on account of his wickedness, for he supposed that Alma and Amulek was no more; and he supposed that they had been slain, by the cause of his iniquity. And this great sin, and his many other sins, did harrow up his mind until it did become exceeding sore, having no deliverance; therefore he began to be scorched with a burning heat.

Zeezrom was sick in Sidom. He had a burning fever. His mind was very troubled because of the bad things he had done. He thought Alma and Amulek were dead. He thought they had been killed because of his sins. This great sin and his many other sins made his mind hurt very badly. He had no way to feel better. So he started to burn with a hot fever.

In Sidom, they learned that Zeezrom was seriously ill with a burning fever. His guilt was eating him alive. He thought Alma and Amulek were dead—killed because of what he had done to them. That terrible sin, along with all his other wrongs, tortured his conscience day and night. He had no peace. The fever burned hotter.