A few bubbles after urinating quickly are normal.
Persistent or unusually foamy urine can sometimes indicate protein in the urine.
Proteinuria may occur with kidney disease, although dehydration and a strong urine stream can also produce foam.
If foam is persistent, especially with swelling in the legs or around the eyes, a urine test may be appropriate.
## Purple Urine
Purple urine is rare.
It can occasionally occur in people with urinary catheters because of chemical reactions involving certain bacteria and compounds in urine.
This is not something most healthy people will ever experience.
## Does Smell Matter Too?
Yes, but odor is also nonspecific.
Strong-smelling urine can occur after:
* Dehydration
* Asparagus
* Coffee
* Vitamins
* Certain medications
A foul odor together with burning, fever, urgency, or pelvic pain may suggest infection.
Sweet-smelling urine can occasionally occur with poorly controlled diabetes, but odor alone is not enough to diagnose it.
## What Urine Color Can Say About Hydration
A simple practical guide is:
