10 Weird Reasons Your Pee Smells Funny

Updated: Oct. 11, 2022

Asparagus isn’t the only thing that makes your pee reek.

Why does your urine smell a little strange? Well, there are the obvious culprits: asparagus with your salmon, maybe too much salt in that movie theater popcorn.
There’s a whole list of reasons the scent of your urine might make you wonder what’s up. Here, urologists and other medical professionals explain 10 major reasons your pee can smell a little “off” at times.
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Doctor holding a bottle of urine sample
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You may have diabetes

Most of us are aware that in this day and age, urologists run blood tests to check for diabetes. But according to reports from back in the 17th century, urologists would analyze urine samples for diabetes by using three of their own senses: sight, smell, and—dare we say it out loud—taste. Thomas Mayo, a physician in the 1670s, described the taste of diabetic urine as “wonderfully sweet as if it were imbued with honey or sugar.” This was a physician who was extraordinarily dedicated to his patients’ wellness, perhaps—but today, this methodology would probably earn him some startled online reviews.

According to a much more modern doctor’s explanation, here’s the science behind high sugar in the urine of people with diabetes: as excess sugar spills into your urine, it creates a sweet smell. This is according to Stephanie J. Kielb, MD, an associate Professor of Urology, Medical Education and Obstetrics and Gynecology at Northwestern University’s Feinberg School of Medicine in Chicago. “If you have uncontrolled diabetes, your body tries to get rid of extra blood sugar or glucose in the urine, creating the sweet smell,” Dr. Kielb says. When your body isn’t getting the glucose it needs for energy, your body begins to burn fat for energy, which produces ketones. This is dangerous and can lead to diabetic ketoacidosis, the American Diabetes Association warns.

Close-up of big white pills.
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You take vitamins 

When you take a vitamin, depending on what it is, it dissolves either in fat or water before your body absorbs it.

Water-soluble vitamins are excreted into your urine, Dr. Kielb says. Not only does this give your urine a strange “multivitamin pill” odor, but it can also turn your urine a fluorescent green or greenish-yellow hue. The good news is that these vitamin-induced urine smells are harmless, so you can keep taking your daily vitamin supplements. Here are the vitamin brands that doctors trust most.

Empty hospital bed with medical equipment.

You live in a nursing home or just got out of the hospital

If your urine smells like metal, you might have a pseudomonas infection. These infections are commonly found in hospital or nursing home patients because the bacteria that cause it (and, in turn, give your pee a metallic scent) thrives in those environments. Sick or elderly people with compromised immune systems are particularly susceptible. “Once there’s a bacteria in the hospital or in the nursing home, it hangs around,” says Craig Comiter, MD, a urologist for Stanford Health Care in Palo Alto, CA. “Once it gets there, it stays there. It’s part of the flora bacterial environment.”

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man's hand holding glass with water

You’re dehydrated

If your pee smells funny in a very distinct way, it may be time to drink up. Your urine can get super concentrated and take on a pungent urine smell similar to ammonia if you don’t drink the recommended seven to eight glasses of water a day. Your body needs water to dilute waste products in your urine. “People should strive to have urine that’s a light yellow color,” says William Brant, MD, a urologist at the University of Utah Health Care in Salt Lake City, UT. “If it’s dark yellow or an amber color, they’re probably not drinking enough water.”

Are you dehydrated? Read The 3 Best Hydrating Beverages That Aren’t Water, from a Certified Sports Dietitian

Port for a catheter or central venous port insertion, puncture at chest wall to aorta artery a medical device as silicone cartridges, has flexible tube with needle and syringe.

You don’t pee in a toilet

People who use catheters and urine drainage bags may complain of an odor in their bags. “That bagged urine really smells because once it’s out of you, the bacteria flourish,” says Dr. Comiter. “It’s not dangerous at all. It’s just the nature of an unsterile urine specimen.”

He suggests dropping an aspirin in the bag because salicylic acid neutralizes the pungent smell. If the odor persists or your urine becomes cloudy, seek a physician’s care.

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Fresh white and green asparagus on linen napkin

You eat a hearty helping of vegetables

Vegetables are good for your body, but don’t be alarmed if they make your urine smell like whatever you ate. Asparagus is a big culprit for smelly urine; in fact, your pee can start smelling like asparagus just 20 minutes after you eat it.

Other foods, including Brussels sprouts, onions, cabbage, and turnips can also make your pee smell funky because of a metabolic byproduct called methyl mercaptan, a gas with a putrid, sulfurous smell that emerges when your body breaks down these vegetables. “The vegetable is still healthy and a good part of your diet,” says Dr. Brant. “These chemicals just happen to be things that we react to.” Try drinking more water to mute the smell of your urine. A well-balanced diet is just one of the many surprising things your pee can reveal about your health.

 White toilet in the bathroom
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You don’t take enough trips to the bathroom

If you need to go, let it flow. Your pee smells funny (think old and smelly) when you frequently hold it in throughout the day. Dr. Comiter refers to this condition as “teacher’s bladder” or “trucker’s bladder” because those are the people who tend to hold it in a lot since they don’t have as much time in the day to go to the bathroom due to their hectic schedules. “If you’re prone to infections or bacteria, then the bacteria will grow and grow until you pee them out,” says Dr. Comiter. “If you’re holding on to it, you will get extra pungent urine.”

Here’s What Happens When You Hold in Your Pee

Frustrated woman in tank top and black lingerie lying in bed and hugging her belly

You may have a urinary tract infection

Urinary tract infections can cause a foul odor that some patients describe as rotten food or sweaty socks. Bad bacteria that snuck its way into your bladder through your urethra often causes these strange odorous smells. There’s also another condition called asymptomatic bacteria that can cause your pee to smell but doesn’t necessarily mean you have a UTI. “About one-third of women over the age of 65 can have bacteria in the urine on and off,” says Dr. Comiter. “But it doesn’t represent a risky infection because it’s just bacteria that flourishes in the urine and then disappears.”

If you experience other symptoms like a burning sensation while peeing or a fever, see a doctor. Keep in mind that a UTI is also just one of the 9 medical reasons you have to pee all the time.

Water flow from a hose.
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You douche too much

The only thing you should be using to cleanse your vaginal area is water. Douching with fluids or chemicals will kill the good bacteria and allow bad bacteria to move in instead. “The vagina, the urine, a lot of your body is supposed to have a certain type of acidity,” says Brant. “If you mess with the acidity, things don’t work out very well.”

Make sure you steer clear of douching and 13 other things your bladder wants you to know.

Keto diet food ingredients
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Your commitment to Keto 

Keto (low-to-no carb, high-fat, protein-heavy diets) are all the rage for weight loss. They work by forcing your body to burn fat for fuel instead of relying on glucose from carbs for energy. “A keto diet induces ketosis which is a metabolic state where your body uses fat for energy,” says Dr. Kielb.”During this state, your urine and breath may both have an odor.” This high-fat, low-carb eating plan has its fans—and detractors. Here’s what the experts say about eating keto for the long-term.

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