Echo-Worm is the name of a strange parasite and affliction found in Chinese anecdotes and materia medica, later noted in Japanese tale collections and essays. A worm is said to enter the body and answer questions from within the belly even when the host does not speak. In Japan it was described as a mouthlike sore on the abdomen that mimics speech and even demands food. Herbal texts mention that thunder-fungus (raimaru) and indigo could expel it, and the worm was said to emerge from the body. Many accounts link it to real-world parasite stories.
Folklore & Legends
Chinese sources such as Chaoye Qianzai and Wenchang Zalu record clinical cases, and the Bencao Gangmu notes the efficacy of thunder-fungus and indigo against the Echo-Worm. In Japan, works like Shinchomonshū, Shiojiri, and Kanden Jihitsu recount that after about ten days of high fever, a mouthlike ulcer appears on the abdomen and echoes speech. One tale says the creature weakens if given medicines it dislikes, after which it is soon expelled. Another story tells of someone trying to exhibit the sufferer as a sideshow, but the family refused out of shame.
A portrait of the Echo-Answering Worm from Edo-period essays and tales. Marked by high fever and a sore like a mouth on the abdomen, its voice echoes the host’s words and at times spews curses. It craves food and drink, and refusal is said to raise the fever. Cures attempted include prayers and decoctions, especially a method of selecting and combining drugs it dislikes, then administering them so the creature weakens and later exits the body. Some accounts describe a lizard-like form with horns, though appearances vary widely. Chinese lore of the echoing parasite merged with Japan’s notion of the human-faced sore, emphasizing a mouth opening in the belly. Attempts to exhibit the illness for profit were recorded, though families often refused for shame. Its origins span materia medica and storytelling, long understood as a disorder set at the boundary of medicine and the uncanny.
Character Profile
This section is our own creative profile for storytelling. It is not historical fact or scholarship.
The diagram below is a diagnostic evaluation chart for Edo Essays and Anecdotes Edition. The higher the value of each item, the stronger that characteristic is expressed.
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