有些小儿,特别喜食煤渣、土块、烟头、火柴、毛发、纸张、毛线以及金属玩具或床栏上的油漆,这种现象医学上称为异食癖或称嗜异症。本病病因尚不十分明确,一般认为是一种心理失常的强迫行为,往往与家庭环境不正常有关。开始是因为无人照顾,擅自取食异物,日久形成习惯,变成不易解除的条件反射。目前多认为是 Some children especially like cinder, clods, cigarette butts, matches, hair, paper, wool, and paint on metal toys or bed rails. This phenomenon is medically known as pica or apophysis. The cause of the disease is not yet very clear, generally considered to be a psychological disorder of compulsive behavior, often with the family environment is not normal. The beginning is because no one take care of, take-away foreign bodies without authorization, the habit of time, become difficult to lift the conditioned reflex. At present think so