A Eucharistic miracle is a miracle that involves the Eucharist, which is a religious practice in which bread and wine are believed to become the body and blood of Jesus Christ. The Catholic Church and other major Christian groups teach that Christ is truly present in the Eucharist, which is itself considered a miracle. However, this should not be confused with other ways God may show His presence. The Catholic Church focuses on two types of revelations: divine revelations, such as the Eucharist itself, and private revelations, such as Eucharistic miracles.

Reported Eucharistic miracles often include events that seem impossible to explain, such as consecrated Hosts (the bread used in the Eucharist) appearing to change into heart tissue, remaining unchanged for very long periods, surviving being burned, bleeding, or even helping people live for many years. In the modern Catholic Church, a special group of scientists and experts carefully investigates these claims to determine if they are "worthy of belief." This helps distinguish true miracles from cases where red-colored microorganisms, like Neurospora crassa or Serratia marcescens, might cause similar effects.

Scientists suggest using careful methods to check for natural causes, such as microbial growth or tissue-like materials, in samples. They also prefer standardized, repeatable tests instead of relying on stories or uncontrolled observations. In a study of 25 events, no evidence of blood or human material—other than skin cells or red blood cells—was found. These cases may have natural explanations.

Like other private revelations, such as reported appearances of the Virgin Mary, belief in approved Eucharistic miracles is not required by the Catholic Church. However, these miracles often help strengthen the faith of believers or serve as messages to the public.

Background

The Roman Catholic Eucharistic doctrine is based on ideas from Aristotle, which explain that the essential part of something (its substance) is different from its visible parts (called accidents). During the Eucharist, through a special prayer called the Eucharistic Prayer, the substance of bread and wine changes into the body and blood of Christ. However, the visible parts of the bread and wine remain unchanged. This change in substance is called transubstantiation. The term transubstantiation was used by scholars but is not part of the official teaching about Christ's presence in the Eucharist. At the Council of Trent in 1551, the church declared that anyone who claimed the substance of bread and wine remained unchanged after the Eucharist, while denying the change of wine into Christ's blood, was to be anathema (excommunicated).

Protestant groups have different views on Christ's presence in the Eucharist. Some, like Lutherans, Anglicans, Methodists, and Reformed Christians, believe Christ is truly present in the Eucharist but reject the term transubstantiation.

Thomas Aquinas taught that if the visible parts of the Eucharist (accidents) change in miraculous events, this is not transubstantiation but a separate miracle meant to strengthen faith. These miracles do not change how Christ is present in the Eucharist.

Lutherans believe Christ's body and blood are united with the bread and wine in the Eucharist, a view called the "sacramental union." They believe this union happens when the priest says the Words of Institution.

The Eastern Orthodox and Oriental Orthodox Churches, such as the Coptic Church, believe the bread and wine become Christ's body and blood during the consecration but do not use philosophical terms to explain this change. The Methodist Church also believes Christ is truly present in the Eucharist through the bread and wine, though the exact way this happens is considered a mystery. Anglicans agree Christ is truly present, but some see this as a spiritual presence, while others believe it is a physical presence. Neither group accepts the term transubstantiation to explain this presence.

History

Jesuit scholar Francis Clark finds evidence of miracles connected to the Eucharist dating back to the 3rd century. He notes that the first recorded miracle involving a bleeding host occurred in the 5th century.

In 1264, Pope Urban IV created the Feast of Corpus Christi. According to legend, this feast was inspired by the miracle that took place in Bolsena.

Extraordinary Eucharistic miracles in the Catholic Church

The Catholic Church believes that every time the Eucharist is given, it is a miracle because the bread and wine become the actual body and blood of Christ. The term "extraordinary Eucharistic miracle" is used to describe unusual events related to the Eucharist that are different from the standard miracle of transubstantiation, the belief that the bread and wine become the actual body and blood of Jesus. This section explains different events and phenomena that are considered extraordinary Eucharistic miracles by the Catholic Church.

One type of miracle involves the Eucharist turning into human flesh, such as the miracle of Lanciano, which some believe happened in Italy in the 8th century. Another involves the Eucharist turning into human blood, like the miracle of Santarém, which some believe occurred in Portugal in the 13th century. The Catholic Church officially recognizes both miracles as true. Another commonly reported miracle is the "bleeding Host," where blood begins to flow from a consecrated host, the bread used in Mass. Other reported events include consecrated hosts being preserved for many years, such as the Miraculous Hosts of Siena.

The Mass at Bolsena, shown in a famous painting by Raphael in the Vatican, is said to have happened in 1263. A priest from Bohemia, who doubted the belief that the Eucharist becomes the body of Christ, celebrated Mass in Bolsena, a town near Rome. During the Mass, the bread of the Eucharist began to bleed. The blood from the host fell onto the altar cloth in the shape of Jesus’ face, and the priest came to believe in the miracle.

In 1370, an event in Brussels involved an attempt to harm several Eucharistic hosts. The hosts were said to have bled but remained unharmed. These hosts were later honored by people.

Caesarius of Heisterbach, a medieval writer, recorded several stories of Eucharistic miracles in his book Dialogue on Miracles. These stories were told by others. One story describes a man who saw an infant in the Eucharist. Another tells of a priest who saw the host turn into raw flesh. A third describes a man who saw an image of Jesus on the cross and blood dripping from the host. In each case, the images eventually returned to the host. Caesarius also wrote about other unusual events, such as bees building a shrine to Jesus after a piece of the Eucharist was placed in a beehive, a church burning to ashes while the Eucharist remained safe, and a woman finding the host turned into congealed blood after storing it in a box.

In 2016, in Aalst, a small town in Belgium, a 200-year-old Eucharistic host in a monstrance suddenly turned blood red. This happened on July 7 at 5:45 p.m. in the home of Father Eric Jacqmin, a sedevacantist who was once part of the SSPX. A professor, Liesbeth Jacxsens, offered to study the host scientifically and suggested the color change might be caused by certain bacteria.

In March 2024, in Chümoukedima, Nagaland, a consecrated host that was not eaten and had been kept to dissolve in water developed a layer from which blood oozed out.

The Catholic Church distinguishes between true miracles and events that can be explained by natural causes. For example, in 2006, a Eucharistic host in Dallas turned red while in a glass. Two professors from the University of Dallas studied it and concluded the change was natural. Bishop Charles Victor Grahmann explained that the host was a mix of fungi and bacteria that grew in the glass over four weeks.

In contrast, the Eucharistic miracle at Sokółka in 2008 involved a host that was tested by two professors. They claimed to find human heart tissue in the host, suggesting it looked like tissue from a living person in pain. However, other experts questioned the results. Some professors, like Lech Chyczewski, said the tests were not reliable and could be explained by biology, such as bacteria like Serratia marcescens. The Medical University of Białystok later said it did not support the findings or the research methods used.

An investigation by Rzeczpospolita reported that the Archbishop sent the host directly to Professor Maria Sobaniec-Łotowska, skipping standard procedures. Professor Sobaniec-Łotowska, a supporter of the Archbishop and the Church, conducted the tests but did not share detailed results. Her colleague, Professor Stanisław Sulkowski, reportedly said the sample did not match heart muscle. The Archbishop refused to allow DNA testing and did not send the host to the Vatican for approval.

Some Catholics have studied relics, including Eucharistic hosts, and found they all have the blood type AB. This has been used to support the belief that the Eucharist becomes the actual body of Jesus and to suggest Jesus likely had AB blood. Catholic scientist Kelly Kearse analyzed claims about this, but the text ends mid-sentence.

In art

The Mass of Saint Gregory is a topic in Catholic art that shows Pope Gregory I and others seeing a miraculous sight of Christ after praying for a sign to help people believe in the real presence of Christ in the Eucharist.

Raphael's fresco, The Mass at Bolsena, created in 1512, shows an event that happened in Bolsena during the 1200s. A Bohemian priest doubted the real presence of Christ in the Eucharist. During the mass, blood began to flow from the host, which helped the priest believe.

List of Eucharistic miracles and Carlo Acutis

Carlo Acutis was an Italian Catholic young man and someone who made websites. He is known for recording many Eucharistic miracles and listing more than 150 of them on a website he created. He died in 2006 from leukemia. In 2025, he was declared a saint.