The digging up of a buried body is called exhumation, and is considered sacrilege by most cultures that bury their dead. However, there is often a number of circumstances in which exhumation is tolerated:

• If an individual died under suspicious circumstances, a legitimate investigating agency (such as a police agency) may exhume the body to determine the cause of death.
• A body may be exhumed so that it may be reburied elsewhere.

Once human remains reach a certain age, many cultures consider the remains to have no communal provenance, making exhumation acceptable. This serves several purposes:

• Many cemeteries have a limited number of plots in which to bury the dead. Once all plots are full, older remains are typically moved to an ossuary to accommodate more bodies.
• It enables archaeologists to search for human remains in order to better understand human culture.
• It enables construction agencies to clear the way for new infrastructure.

Frequently, cultures have different sets of exhumation taboos. Occasionally these differences result in conflict, especially in cases where a culture with more lenient exhumation rules wishes to operate on the territory of a stricter culture. For example, United States construction companies have run into conflict with Native American groups that wanted to preserve their ancient burial grounds from any form of modern construction.

Rituals

In folklore and mythology, exhumation has also been frequently associated with the performance of rites to banish undead manifestations. An example is the Mercy Brown Vampire Incident of Rhode Island, which occurred in 1892.

Excarnation

Excarnation consists of exhumating the remnants to give them to animals. It was probably part of the bronze age death rites. Dogs and other scavengers gnawed on human corpses, reducing most of the bones to small fragments in the process.

Since ancient times, Zoroastrians have disposed of their dead by leaving the corpses in the open air, to be devoured by carnivorous birds and beasts. The Towers of Silence (Doongerwadi) have existed in Bombay since 1673. In modern Bombay there can be no beasts, but the vultures remain, ready to swoop down at the appointed times for their daily meals.

Secondary death rituals

In these rites, the body is treated one way and additional remains are treated another. For example, in modern, rural, south China, the corpse is buried with ceremony. After enough time has passed for the flesh to decompose, the bones are exhumed, cleansed, ritualized again then reburied.

It is suggested that dual rituals serve dual purposes with the specific purposes varying among cultures. When considering the dual rituals of contemporary Western cremations, it may be that one ritual addresses "community or family problems of social reintegration and the other resolves personal problems of bereavement.