Jiang Shi - Genesis

Genesis

Qing Dynasty scholar Ji Xiaolan mentioned in his book Yuewei Caotang Biji (閱微草堂筆記) that the causes of a corpse being reanimated can be classified in two groups: a recently deceased person returning to life, and a long buried corpse not decomposing. Some causes are described below:

• The chemical composition of the burial ground is unsuitable for living organisms, so bacteria is not present to help in the decaying process. The corpse's hair and nails appear to be growing and there are no evident signs of decomposition. If not dealt with, the corpse will eventually become a jiang shi over time. (In fact, a corpse's flesh will actually contract and withdraw, so hair and nails originally concealed under the flesh become more exposed, creating an illusion of "growing" hair and nails.)
• The use of supernatural arts to resurrect the dead.
• Spirit possession of a dead body.
• A corpse absorbs sufficient yang qi to return to life.
• A person's body is governed by three huns and seven pos. Qing Dynasty scholar Yuan Mei's book Zi Bu Yu mentioned that "A person's hun is good but his po is evil, his hun is intelligent but his po is foolish". The hun leaves his body after death but his po remains and takes control of the body, so the dead person becomes a jiang shi.
• The dead person is not buried even after a funeral has been held. The corpse comes to life after it is struck by a bolt of lightning, or when a pregnant cat (or black cat in some tales) leaps across the coffin.
• When a person's soul fails to leave the deceased's body, due to improper death, suicide, or just wanting to cause trouble.
• A victim of premature burial.
• A person injured by a jiang shi is infected with the "jiang shi virus" and gradually changes into a jiang shi over time, as seen in the Mr. Vampire films.