The regular color of urine varies. It depends on how much water you drink. Fluids dilute the yellow pigments in urine. So the more you drink, the clearer your urine looks. When you drink less, the yellow color becomes stronger.

But urine can turn colors far beyond what's typical, including:

• Red.
• Blue.
• Green.
• Orange.
• Dark brown.
• Cloudy white.

When to see a doctor

See your health care provider if you have:

• Blood in your urine. This is common in urinary tract infections and kidney stones. Those problems often cause pain. Painless bleeding might be a sign of a more serious problem, such as cancer.
• Dark or orange urine. This can be a sign that the liver isn't working correctly, especially if you also have pale stools and yellow skin and eyes.

A change in urine color is often caused by certain medicines, foods or food dyes. Sometimes it's caused by a health problem.

Here are some unusual urine colors along with things that can cause them. Keep in mind that colors can look slightly different to different people. For instance, what looks red to you might look orange to someone else.

Red or pink urine

Red urine isn't always a sign of a serious health problem. Red or pink urine can be caused by:

• Blood. Health problems that can cause blood in the urine include an enlarged prostate, tumors that aren't cancer, and kidney stones and cysts. Some cancers can cause blood in urine too. Hard exercise, such as long-distance running, also can cause this bleeding.
• Foods. Beets, blackberries and rhubarb can turn urine red or pink.
• Medicines. A tuberculosis medicine called rifampin (Rifadin, Rimactane) can turn urine reddish-orange. So can a medicine for urinary tract pain called phenazopyridine (Pyridium). Constipation drugs that contain the medicine senna also can bring on this color change.

Orange urine

Orange urine can be caused by:

• Medicines. Phenazopyridine and some constipation medicines can turn urine orange. So can sulfasalazine (Azulfidine), a medicine that lessens swelling and irritation. Some chemotherapy medicines for cancer also can make urine look orange.
• Vitamins. Some vitamins, such as A and B-12, can turn urine orange or yellow-orange.
• Health problems. Orange urine can be a sign of a problem with the liver or bile duct, mainly if you also have light-colored stools. Dehydration also can make your urine look orange.

Blue or green urine

Blue or green urine can be caused by:

• Dyes. Some brightly colored food dyes can cause green urine. Dyes used for some kidney and bladder tests can turn urine blue.

• Medicines. A medicine for depression called amitriptyline can make urine look greenish-blue. So can a treatment for ulcers and acid reflux called cimetidine (Tagamet HB). A water pill called triamterene (Dyrenium) also can turn urine greenish-blue.

  Urine can turn green due to a medicine for pain and arthritis symptoms called indomethacin (Indocin, Tivorbex). Green urine also can be caused by propofol (Diprivan), a strong medicine that helps people sleep or relax before surgery.

• Health problems. A rare disease called familial benign hypercalcemia can cause children to have blue urine. Urinary tract infections caused by a certain type of bacteria can cause green urine.

Dark brown or cola-colored urine

Brown urine can be caused by:

• Food. Eating lots of fava beans, rhubarb or aloe can cause dark brown urine.
• Medicines. Some medicine that can darken urine are:
  • Chloroquine and primaquine, which treat and prevent malaria.
  • The antibiotics metronidazole (Flagyl, Metrocream, others) and nitrofurantoin (Furadantin, Macrobid, others).
  • Constipation medicines that contain senna (Senokot, Ex-Lax, others).
  • Methocarbamol (Robaxin), a muscle relaxer.
  • The seizure medicine phenytoin (Dilantin, Phenytek).
  • Medicines called statins that lower cholesterol.
• Health problems. Some liver and kidney disorders and some urinary tract infections can turn urine dark brown. So can bleeding inside the body called a hemorrhage. A group of illnesses that mainly affect the skin or the nervous system, called porphyria, also can cause brown urine.
• Extreme exercise. A muscle injury from extreme exercise can cause tea- or cola-colored urine. The injury can lead to kidney damage.

Cloudy or murky urine

Urinary tract infections and kidney stones can cause urine to look cloudy or murky.

A change in urine color that isn't due to foods or medicine could be caused by a health problem. Some things that put you at risk of health problems that can affect urine color are:

• Age. Tumors of the bladder and kidney, which can cause blood in the urine, are more common in older people. Men older than 50 sometimes have blood in the urine due to an enlarged prostate gland.
• Family history. If any of your blood relatives, such as a parent, sibling or grandparent, have kidney disease or kidney stones, you're more likely to get them too. Both kidney disease and kidney stones can cause blood in the urine.
• Hard exercise. Distance runners are most at risk. But anyone who exercises hard can have blood in the urine.

Your health care provider will likely ask you about your health and do a physical exam. You also may need tests, including:

• Urinalysis. This test checks the urine for possible signs of kidney or urinary tract problems. A sample of urine also is likely to be checked for bacteria that cause illness.
• Blood tests. Some blood tests measure the level of waste products that build up in the bloodstream when the kidneys are not working properly. Your provider also might check your blood for signs of liver problems and other health conditions such as diabetes.

Treatment, if needed, will depend on the health problem that causes the change in urine color.

When you're dehydrated, your urine becomes darker in color. If this happens, it might mean you need more fluids. Make sure you drink enough fluids daily to stay hydrated and keep yourself healthy.

You'll likely start by seeing your primary care provider. In some cases, you might be referred to a doctor who specializes in urinary tract disorders, called a urologist.

Here's some information to help you prepare for your appointment.

What you can do

When you make the appointment, ask if there's anything you need to do to prepare. Make a list of:

• Your symptoms and when they began.
• Key medical information, including any other health problems you have and whether bladder or kidney diseases run in your family.
• All medicines, vitamins and other supplements you take, including the doses. A dose is how much you take.
• Questions to ask your doctor.

For urine color, questions to ask include:

• What might be causing my symptoms?
• What tests do I need?
• Will I need treatment?

What to expect from your doctor

Your health care provider is likely to ask you questions, such as:

• What color is your urine? Is it always this color, or only sometimes?
• Do you see blood or blood clots in your urine?
• Does your urine have an unusual smell?
• How often do you pee? And does it hurt to pee?
• Has your appetite or thirst changed?
• Have you had any urinary problems before?
• Do you have allergies?