Thallium neuropathy

Michael T Pulley MD PhD (

Dr. Pulley of the University of Florida, Jacksonville, received honorariums from Alexion, Bio Products Laboratories, CSL Behring, Catalyst, and Stealth BioTherapeutics for consulting work.

Louis H Weimer MD, editor. (

Dr. Weimer of Columbia University has received consulting fees from Roche.

Originally released October 6, 1999; last updated August 10, 2017; expires August 10, 2020


Thallium poisoning is still a source of toxic exposure. Dermatologic changes along with alopecia are key clues to the diagnosis of this painful neuropathy. In this article, the author reviews the clinical and laboratory features.

Key points


• Alopecia is one of the clues to thallium poisoning, as it is almost always present.


• Thallium neuropathy is usually predominately sensory, affecting both small fibers (pain) and large fibers (ataxia).

Historical note and terminology

Pesticides and rodenticides based on thallous salts were commonly used in the past. Although they are rarely used now, poisoning from accidental (mostly children), suicidal, or homicidal ingestion continues to occur (Rusyniak et al 2002; Yumoto et al 2017). Although industrial occupations may result in exposure to thallium, this is usually low level and chronic, rather than acute and high level (Feldman 1999). Consumption of contaminated food and water (Moeschlin 1980; Kuo et al 2005) may also be a source of intoxication. Thallium intoxication has also been reported with contaminated drugs, including heroin and cocaine (Afshari et al 2012).

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