Urinary retention, also known as ischuria, is a lack of ability to urinate.

Physical factors may cause ischuria, constipation, as well as numerous spleen-related diseases such as hypersplenism, thrombocytopenia, and lymphoma.

De l'Ischurie hystérique (with Désiré-Magloire Bourneville) Paris : A. Delahaye, 1876 - On hysterical ischuria.