Foamy urine is the presence of a white froth or bubbly lather in the toilet bowl after urinating. It is a common sign of proteinuria (protein in the urine). It can frequently occur for less innocuous reasons and may be transient with no other episode occurring again for weeks or months.
What Causes Foamy Urine?
Questions to Ask if Urine is Foamy
- Has a detergent been added to the toilet water? Toilet sanitizers added to the cistern (tank) water may cause frothy water and once these bubbles settle, any agitation will cause the bubbles to form again. Recently cleaned toilet bowls may still have remnants of soapy detergents.
- Is your urine flow forceful? Straining or pushing out the urine with force can cause bubbling of the water. Urinating ‘loudly’ may be a sign of forceful urination. Gravity also plays a part in the force of the urine striking the water in the toilet bowl.
- Has the toilet bowl been flushed? The presence of another person’s urine, probably with protein in their urine, may cause bubbling on subsequent use if the toilet has not been flushed.
- Have you recently had sexual intercourse or been sexually stimulated? In men, the presence of semen remaining in the urethra could cause foamy urine although under usual circumstances, the quantity of remaining semen is too little. However, retrograde ejaculation where semen enters the bladder is a possible cause of foamy urine. In women, foamy urine due to the presence of vaginal discharge is less likely.