In Lord of the Flies what is mankinds's essential illness?

In chapter four: Painted Faces And Long hair, the littluns are described as being used to stomach-aches and a sort of chronic diarrhoea. Many also suffer from nightmares and one small boy, Percival, had crawled into a shelter and spent two days singing, talking and crying until the others had thought he was going insane. In chapter four: Painted Faces And Long hair, the littluns are described as being used to stomach-aches and a sort of chronic diarrhoea. Many also suffer from nightmares and one small boy, Percival, had crawled into a shelter and spent two days singing, talking and crying until the others had thought he was going insane.