Three Corpses

What they are

The name sānshī is usually rendered into English as Three Corpses, though the Chinese word does not mean a dead body kept inside a living person. It points instead to the death these beings are thought to cause, so some writers prefer Three Deathbringers. A second name, sānchóng, means three worms or three bugs, and it also names real intestinal parasites in Chinese medical writing. Daoists placed the three in the three dantian, the energy centres of head, chest and abdomen. They were said to arrive with the newborn and to be released as harmful ghosts once their host died.

Early texts

Chinese classics from the Han era, roughly 206 BCE to 220 CE, are the earliest surviving works to name these beings. The Liexian Zhuan, a collection of immortal lives put together by Liu Xiang, tells how the master Ruan Qiu drove them out of his student Zhu Huang with a seven-drug prescription given nine times a day for a hundred days. Wang Chong's Lunheng, written around 80 CE, compared them to leeches and mocked critics who likened corrupt officials to worms. From the Jin era, 266 to 420, onward, Daoist writers pictured them both as animals and as clerks in a heavenly bureaucracy, and the Shangqing school carried the idea into its scriptures.

Fighting them off

A Daoist who wanted the long life of a xian, a transcendent, had to get the three out of the body. The first step was bigu, going without grain and cereals, since the creatures were believed to feed on the rotting matter left when grain was digested. That weakened them but could not finish them. Waidan alchemy, using drugs such as cinnabar, could kill them, and neidan inner meditation was said to remove them for good. Adepts also learned to picture the corpse-worms inside themselves, because a spirit that was properly visualised was thought to stay where it belonged.

Body gods and souls

The body was crowded with other residents. Daoists spoke of neishen, internal gods, and shenshen, body gods, living in the five viscera, the six receptacles and the seven openings of the head. Each dantian held both the three parasites and guardian deities called the sanyi, the Three Ones, and the two sides struggled constantly. The three could change shape, appearing now as demons, now as people. Alongside them ran the old Chinese idea of two souls: the hun, which is light and leaves at death, and the po, which stays with the corpse. Some traditions counted three hun and seven po, and scholars have described the parasites as an offshoot of the destructive po.

Reports and the vigil

On gengshen, the fifty-seventh day of the sixty-day cycle, the three were said to climb to heaven while their host slept, give an account of their host's faults to Siming, the Director of Destinies, and so have days taken off that person's life. The plain answer was to stay awake. A vigil through that whole day and night kept them inside the body, and a line quoted from the Huangting jing promised immortality to anyone who did not sleep. The Baopuzi, written by Ge Hong around 320 CE, is the earliest detailed account, and it also records elixirs meant to destroy the parasites. The watch later took root in Japan as Kōshin.

How Three Corpses is kept

Daoist practitioners treated the three as a problem of daily living. They watched the calendar for gengshen, the fifty-seventh day of the sexagenary cycle, and sat up through it rather than sleep. Many cut grain from the diet, a practice called bigu, and ate little or nothing of it. Some took alchemical preparations, cinnabar among them. Others spent long hours in neidan meditation, picturing the parasites so that they would stay in place. Illness, bad luck and a shortened life were all read as signs that the three were at work.

When and where

The day that matters is gengshen, the fifty-seventh of the sixty days in the sexagenary cycle. It returns roughly every two months and falls on a different date each time. The reports were thought to be made on its night. Daoists also blamed the three for illnesses that came during unlucky stretches of the calendar.

The belief belongs to China and to the Daoist schools there, above all the Shangqing tradition. It appears in scriptures, hagiography and medical writing read across the Chinese world. Later it took root in Japan, where the watch kept on gengshen nights became the Kōshin practice.

What Three Corpses means

A person was not alone inside their own body; the body was a small copy of the universe, holding energies, gods and enemies at once. The three also carried a moral charge: they kept a record of faults and handed it to a divine clerk, so that illness and early death became the visible price of wrongdoing. Cultivation was therefore both medicine and discipline, a way of keeping the self whole and long-lived.

Questions people ask about Three Corpses

See also

Symbolic starsHelpful and harmful influences read from the Chinese calendar's stems and branchesMoon rabbitA hare seen in the Moon's dark patches, pounding rice cakes or the elixir of lifeFive GrainsA sacred grouping of staple crops honoured as the bedrock of East Asian civilizationZangfuA Chinese medicine view of organs as networks of qi, blood and five phases

Good reading and sources

• Three Corpses on WikipediaEncyclopedia
• Wikidata recordOpen data

It may contain mistakes. Traditions differ from one family, village and community to the next, and the people who keep them know them best. If something is wrong, tell us. Last refreshed 2026-10-10.