Démangeaison vs. prurit
While démangeaison and prurit both translate to itch or itching, they are not interchangeable. The primary difference lies in their register and context: one is for everyday use, and the other is a technical, medical term.
Démangeaison
A2Démangeaison is the common, everyday word for an itch or itching. It describes the physical sensation and is used by everyone in daily conversation. It can refer to any type of itch, from a simple insect bite to a more persistent condition, and is often used in the plural (des démangeaisons).
Cette piqûre de moustique me donne des démangeaisons terribles.
(This mosquito bite is making me terribly itchy.)
J'ai la peau sèche en hiver, ce qui provoque une sensation de démangeaison.
(I have dry skin in winter, which causes an itching sensation.)
Mon allergie au pollen cause des démangeaisons aux yeux et au nez.
(My pollen allergy causes itching in my eyes and nose.)
Le contact avec cette plante a laissé des rougeurs et des démangeaisons sur ma main.
(Contact with that plant left redness and itching on my hand.)
Après avoir lu ce livre sur l'aventure, il a une démangeaison de voyager.
(After reading that book about adventure, he has an itch to travel.)
Prurit
B2Prurit is the formal, medical, and scientific term for itching. It is used by healthcare professionals like doctors, dermatologists, and pharmacists to refer to itching as a clinical symptom or condition. You would find this word in medical reports, scientific articles, or on medication packaging, but almost never in casual conversation.
Le patient se plaint d'un prurit sévère sur tout le corps.
(The patient complains of severe pruritus over his entire body.)
Cette crème est indiquée pour le traitement du prurit associé à l'eczéma.
(This cream is indicated for the treatment of pruritus associated with eczema.)
Le prurit est un symptôme fréquent de nombreuses affections dermatologiques.
(Pruritus is a frequent symptom of many dermatological conditions.)
L'étude clinique évalue l'efficacité d'un nouveau médicament contre le prurit sénile.
(The clinical study is evaluating the efficacy of a new drug against senile pruritus.)
Le médecin doit déterminer la cause sous-jacente du prurit pour prescrire le bon traitement.
(The doctor must determine the underlying cause of the pruritus to prescribe the right treatment.)
Summary
In short, use démangeaison when you talk to friends, family, or in any informal setting about the feeling of being itchy. Use prurit when you are in a medical context, such as speaking with a doctor, reading a medical document, or describing a formal symptom. It is the direct equivalent of the English medical term pruritus.