St. Anthony's Fire (SAF) is an illness brought on by the ingestion of fungus-contaminated rye grain causing ergot poisoning (ergotism). The disease's common name derives from the medieval Benedictine monks dedicated to that saint who offered treatment to sufferer's, sometimes using relics of the saint to do so. The 'fire' element is in reference to the burning sensation sufferers of the disease often feel in the extremities of the body. SAF is less well-known than the Black Death plague but was constantly present throughout the Middle Ages. No figures are available to indicate the number of people who may have died from SAF although in one incident alone, an outbreak in France in 994 CE, the illness caused 20,000-40,000 deaths throughout the country. SAF, with its frequent symptoms of gangrene, convulsions, sores and even hallucinations, plagued medieval society, contributing to the oftentimes miserable existence for many people.
This is a companion discussion topic for the original content at https://www.worldhistory.org/St_Anthony's_Fire/.