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Preta (Sanskrit) or Peta (Pāli), Tibetan yi.dvags, is the name for a type of supernatural being described in Buddhist, Hindu and Jain texts that undergoes more than human suffering, particularly an extreme degree of hunger and thirst. They are often translated into English as "Hungry ghosts", from the Chinese, which in turn is derived from later Indian sources generally followed in Mahayana Buddhism. In early sources such as the Petavatthu, they are much more varied. The descriptions below apply mainly in this narrower context.

Pretas are believed to have been jealous or greedy people in a previous life. As a result of their karma, they are afflicted with an insatiable hunger for a particular substance or object. Traditionally, this is something repugnant or humiliating, such as human corpses or feces, though in more recent stories, it can be anything, however bizarre.

The word preta is derived from Sanskrit pra ita, literally "(one who is) gone forth" and originally referred to any of the spirits of the deceased - compare the English use of "the departed". It later became confined to a type of unhappy or malevolent spirit, and as such it was taken up by Buddhists to describe one of six possible states of rebirth.

Pretas are invisible to the human eye, but some believe they can be discerned by humans in certain mental states. They are described as human-like, but with sunken, mummified skin, narrow limbs, enormously distended bellies and long, thin necks. This appearance is a metaphor for their mental situation: they have enormous appetites, signified by their gigantic bellies, but a very limited ability to satisfy those appetites, symbolized by their slender necks.

Pretas are often depicted in Japanese art (particularly that from the Heian period) as emaciated human beings with bulging stomachs and inhumanly small mouths and throats. They are frequently shown licking up spilled water in temples or accompanied by demons representing their personal agony. Alternately, they may be shown as balls of smoke or fire.

Pretas dwell in the waste and desert places of the earth, and vary in situation according to their past karma. Some of them can eat a little, but find it very difficult to find food or drink. Others can find food and drink, but find it very difficult to swallow. Others find that the food they eat seems to burst into flames as they swallow it. Others, if they see something edible or drinkable and desire it, it withers or dries up before their eyes. As a result, they are always hungry.

In addition to hunger, Pretas suffer from immoderate heat and cold; they find that even the moon scorches them in the summer, while the sun freezes them in the winter.

The sufferings of the Pretas often resemble those of the dwellers in Naraka, and the two types of being are easily confused. The simplest distinction is that beings in Naraka are confined to their subterranean world, while the Pretas are free to move about.

Pretas are generally seen as little more than nuisances to mortals unless their longing is directed toward something vital, such as blood. However, in some traditions, pretas try to prevent others from satisfying their own desires by means of magic, illusions, or disguises. They can also turn invisible or change their faces to frighten mortals.

Generally, however, pretas are seen as beings to be pitied. Thus, in some Buddhist monasteries, monks leave offerings of food, money, or flowers to them before meals.

In Japan, preta is translated as Japanese: gaki (餓鬼, "hungry ghost").

Since 657, some Japanese Buddhists have observed a special day in mid-August to remember the gaki. Through such offerings and remembrances (segaki), it is believed that the hungry ghosts may be released from their eternal torment.

In the modern Japanese language, the word gaki is often used to mean spoiled child, or brat. In a game of tag, the person who is "it" may be known as the "gaki."

• Bhavacakra
• Bon Festival
• Buddhist cosmology
• Chöd
• Ganachakra
• Ghost Festival
• Hungry ghost
• Jikininki
• Maudgalyayana
• Segaki
• Six realms
• Tingsha