What does idiopathy mean?
An idiopathy is a medical condition that arises without a known or identifiable cause. The term is especially common in specialist medicine, where it indicates that doctors have recognized a disease pattern but cannot determine why it developed. Idiopathic does not mean that a condition is untreatable or imaginary; many idiopathic illnesses can still be diagnosed and managed according to their symptoms. The word also has an older, more general sense meaning a peculiar personal habit or characteristic, though modern English usually uses 'idiosyncrasy' in that sense. In a medical context, 'idiopathic' suggests careful investigation without a demonstrated cause, whereas in general speech the related expression 'idiopathic curiosity' can playfully describe an intense, inexplicable urge to investigate or understand something.
A disease or condition that develops spontaneously and has no identifiable cause.
"The disorder is idiopathic, so treatment focuses on controlling its symptoms."
Often used in medical diagnosis to indicate that no cause has yet been established.
A peculiar personal habit, preference, or characteristic.
"Her habit of naming every pen after famous poets was an endearing idiosyncrasy."
This older sense is now less common than 'idiosyncrasy' and can sound mildly dismissive.
The plural is used for distinct idiopathic diseases or conditions.
"The researchers compared the symptoms of several rare idiopathic neuropathies."
An idiopathic condition is one whose cause remains hidden even after medicine has done its best detective work.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does idiopathy come from?
Idiopathy comes from Greek idios, meaning 'one's own' or 'private', and pathos, meaning 'suffering' or 'feeling'. In medical usage, the word developed to describe a disease that developed independently and without an apparent cause. The Greek root idios also underlies English words such as idiom, idiosyncrasy, and idiotic, although these have developed different meanings over time.
Related word forms
How idiopathy is actually used
In medicine, the term is used when a condition is recognized but its cause cannot be determined. Its older, nonmedical sense can sound dismissive when applied to someone's habits or preferences, and it is less common than the more neutral term 'idiosyncrasy' in that use.
Easily confused with idiopathy
An idiom is an expression whose conventional meaning differs from the literal meaning of its words, whereas an idiosyncrasy is a peculiar habit, preference, or manner.