Yellow Urine: When It's Normal, When It Signals Dehydration, and Other Causes

Normal Variation

Pale straw to transparent yellow = well-hydrated. Color comes from urochrome (urobilin), a hemoglobin breakdown product.

Dehydration

Dark yellow/amber = concentrated urine; increase fluid intake.

Other Causes

• Foods: Beets (pink/red), carrots (orange), asparagus (greenish), B vitamins (bright yellow).
• Medications: Rifampin (orange), phenazopyridine (orange), nitrofurantoin (brown), chloroquine, metronidazole.
• Medical conditions: Liver disease (dark urine + pale stool), hemolysis (tea-colored), UTI (cloudy), porphyria.

When to See a Doctor

Persistent dark urine despite hydration, red/brown urine without dietary cause, associated symptoms (pain, fever, jaundice, fatigue).