What does iodism mean?
Iodism is a rare medical condition in which excessive exposure to iodine produces toxic effects. It may occur when someone takes high-dose iodine supplements, uses certain iodine-containing medicines, or has prolonged exposure to unusually large amounts of iodine. Symptoms can involve the thyroid and other organs, although the presentation varies with the severity and duration of exposure. The word is chiefly used in clinical and toxicological writing; in ordinary conversation, “iodine poisoning” may be clearer. Despite iodine’s status as an essential nutrient, more is not necessarily better: both deficiency and excessive intake can create health problems. Iodism is consequently an important reminder that supplements and concentrated iodine preparations should be used only at professionally recommended doses.
nounA condition of poisoning caused by excessive exposure to iodine or iodine compounds, typically following excessive supplementation or prolonged high intake.
- A toxic condition caused by an excessive amount of iodine in the body.
"The patient developed iodism after taking far more iodine than recommended."
"Excessive iodine supplementation can cause iodism in susceptible individuals."
"The clinical report described symptoms consistent with acute iodism."
The plural is rare and would normally be used only when discussing multiple cases or instances of the condition.
"The study compared the clinical features of two iodisms."
Iodism turns an essential nutrient into a cause of poisoning when too much iodine accumulates in the body.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does iodism come from?
Iodism was formed in the 19th century from “iodine” and the suffix “-ism,” a combining form that can indicate a condition or state. “Iodine” itself takes its name from the Greek iōdē, meaning “violet,” referring to the colour of its vapour. The related chemical forms “iodide,” “iodate,” and “iodinate” belong to the same modern chemical word family.
Related word forms
How iodism is actually used
This is a specialized medical term and is not commonly used in general speech. In medical contexts, it usually denotes toxicity associated with excessive iodine intake rather than an allergy to iodine.
Easily confused with iodism
Iodine is the chemical element and a nutrient, whereas iodism is the harmful condition caused by excessive exposure to it.
Iodide is an ion or compound formed from iodine, while iodism is the clinical condition of iodine poisoning.