What does diuresis mean?
Diuresis refers to the increased production and excretion of urine by the kidneys, a process that can occur naturally or be deliberately induced. The body regulates urine output carefully through hormones like vasopressin (also called antidiuretic hormone), so when this control loosens — through caffeine, alcohol, cold exposure, diabetes, or medication — urine volume rises noticeably. In clinical medicine, diuresis is often a therapeutic goal: doctors prescribe diuretics such as furosemide to remove excess fluid in patients with heart failure, kidney disease, or hypertension. The term appears frequently in phrases like 'osmotic diuresis', where substances such as glucose in poorly controlled diabetes draw extra water into the urine. While primarily a medical and scientific word rather than one for casual speech, understanding diuresis helps explain common experiences, from why a cold walk makes you need the bathroom to how certain blood-pressure medications work.
nounThe increased production of urine by the kidneys, whether occurring naturally or induced by drugs such as diuretics.
- Increased excretion of urine by the kidneys, especially as a physiological response or the effect of a diuretic drug.
"Caffeine and alcohol can both produce a mild diuresis, which is why several cups of coffee leave you reaching for the restroom."
"The physician prescribed a loop diuretic to promote diuresis in the patient with congestive heart failure."
"Cold weather can trigger cold diuresis, as the body redirects blood from the extremities toward its core, increasing kidney filtration."
Rarely used in the plural; diuresis is almost always treated as an uncountable mass noun in medical contexts.
"Different agents produced distinct patterns of diureses across the trial groups."
Your kidneys filter about 180 litres of fluid a day but normally excrete only about 1.5 litres as urine — diuresis is what happens when that delicate balance tips, and it's why your morning coffee sends you to the bathroom within half an hour.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of diuresis
Diuresis derives from the Greek 'dia-' meaning 'through' or 'apart' and 'ourein' meaning 'to urinate', literally conveying the idea of urine flowing through. The term entered English via New Latin in the early modern period as medical vocabulary was being systematised from classical roots. It shares its root with 'diuretic' (an agent that promotes urine production) and with 'urine' itself, both tracing back to the same Greek source.
How diuresis is actually used
Diuresis is a technical term used almost exclusively in medical, pharmacological, and physiological contexts; it is not part of everyday conversation, where 'passing water' or 'going to the bathroom' would be used instead. It is uncountable in most uses and carries no emotional connotation — it is purely descriptive.
Easily confused with diuresis
A diuretic is the drug or agent that causes diuresis, while diuresis is the increased urine output itself.