Anointing of the sick, known also by other names such as unction, is a form of religious anointing or "unction" (an older term with the same meaning) for the benefit of a sick person. It is practiced by many Christian churches and denominations.
Anointing of the sick was a customary practice in many civilizations, including among the ancient Greeks and early Jewish communities. The use of oil for healing purposes is referred to in the writings of Hippocrates.
Anointing of the sick should be distinguished from other religious anointings that occur in relation to other sacraments, in particular baptism, confirmation and ordination, and also in the coronation of a monarch.
Since 1972, the Roman Catholic Church has used the name "Anointing of the Sick" both in the English translations issued by the Holy See of its official documents in Latin and in the English official documents of Episcopal conferences. It does not, of course, forbid the use of other names, for example the more archaic term "Unction of the Sick" or the term "Extreme Unction". Cardinal Walter Kasper used the latter term in his intervention at the 2005 Assembly of the Synod of Bishops. However, the Church declared that "'Extreme unction' ... may also and more fittingly be called 'anointing of the sick'", and has itself adopted the latter term, while not outlawing the former. This is to emphasize that the sacrament is available, and recommended, to all those suffering from any serious illness, and to dispel the common misconception that it is exclusively for those at or very near the point of death.
Extreme Unction was the usual name for the sacrament in the West from the late twelfth century until 1972, and was thus used at the Council of Trent and in the 1913 Catholic Encyclopedia. Peter Lombard (died 1160) is the first writer known to have used the term, which did not become the usual name in the West till towards the end of the twelfth century, and never became current in the East.