You might not think much about your urine, but it can hold important clues about your health. Urine is produced when your kidneys filter waste and extra water out of your blood.

The waste travels to your bladder, which holds the urine until you’re ready to use the bathroom. Then your bladder muscles contract, sending urine out through a tube called the urethra.

This process is important. When you don’t urinate regularly, waste and fluid can build up to unhealthy levels in your body. Every day your kidneys produce up to 1 to 2 quarts of urine.

Urine gets its color, which is typically yellow, from a pigment called urochrome, or urobilin. Lighter colored urine is more diluted, whereas darker urine contains less fluid. Very dark urine could be a sign that you’re dehydrated.

If your urine doesn’t fit within this color scheme, don’t panic. A lot of things can change the color of urine, including the foods you eat or the medications you take. For example, beets and berries can turn your urine red.

Depending on which medication you take, your urine can turn a rainbow of colors, from yellow to red to blue.

Certain colors, however, can indicate a problem. A red or pink hue could be a sign of blood in your urine. If you suspect blood or notice clots, you should see your doctor to determine the cause.

Brown urine may indicate something as simple as a new medication, or it could be a sign of a more serious condition. Here are some possible causes of brown urine.

Some foods may turn urine brown if you eat enough of them. These include:

  • aloe
  • fava beans
  • food colorings
  • rhubarb

Medical conditions and disorders that can turn urine brown include:

Medications that can make your urine darker include:

  • antimalarials like chloroquine (Aralen) and primaquine
  • antibacterial drugs, such as furazolidone (Furoxone), metronidazole (Flagyl), and nitrofurantoin (Macrobid)
  • iron supplements
  • laxatives that contain cascara or senna
  • levodopa, which is used to treat the symptoms of Parkinson’s disease

Additionally, muscle injury caused by intense exercise, injury, or chemical means can lead to rhabdomyolysis. This can cause the release of a substance called myoglobin, which turns urine brown or pink.

If this occurs after exercise, it’s important to seek medical attention right away.

If you notice that your urine is darker, a good first step is to drink more water to rule out dehydration. You should also think about the foods you’ve eaten and the medications you’ve taken. If this doesn’t bring to mind a cause, check for other symptoms.

For example, if your urine is dark brown and you also notice a yellowing of your skin and eyes, see your doctor as soon as possible. These could be signs of a liver problem.

When you visit your doctor, they’ll test your urine to look for health problems that could be affecting its color. These include tests to see whether your kidneys are filtering normally and to look for urinary tract infections.

Your doctor may also do blood tests. Once you know what’s to blame for the color change, you can stop eating the offending food, switch medications, or treat the condition involved.