Why do I smell like onions?

A dry mouth allows bacteria to thrive. Bacteria that live in the mouth can make compounds that have sulfur. These compounds are especially stinky. They can smell like rotten eggs or onion, for example.

newsinhealth.nih.gov - Smelling Sickness | NIH News in Health

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Smelling Sickness

Body Odor May Be Sign of Disease

Did anyone ever tell you that you smell bad? Funky breath or stinky underarms can happen to anyone, at any age. Whether or not you’ve noticed them, some body odors can signal a health problem. But most breath and body odors are normal. “Bad breath is most often caused by bacteria on the teeth and tongue,” explains Dr. Madeleine S. Deming, an internal medicine expert at the NIH Clinical Center. It’s normal if your breath smells a little in the morning, especially if you slept with your mouth open. A dry mouth allows bacteria to thrive. Bacteria that live in the mouth can make compounds that have sulfur. These compounds are especially stinky. They can smell like rotten eggs or onion, for example. If bad breath isn’t cleared up by brushing your teeth or using mouthwash, it may be a sign of another issue. Over time, bacteria can cause tooth decay and gum disease. Decay and gum disease do not smell good. Both require a trip to the dentist for treatment. Other causes of foul breath odor may be sinus, throat, or lung infections. These need to be treated by a health care professional, too. Your breath can also carry clues of disease from other parts of your body. That’s because you exhale more than just air. Your breath also contains gassy compounds that move from your organs through the bloodstream into your lungs. Breath that smells fruity or like rotten apples, for example, can be a sign of diabetes that’s not under control. Rarely, people can have bad breath because of organ failure. A person with kidney failure may have breath that smells like ammonia or urine. Serious liver disease can make breath smell musty or like garlic and rotten eggs. Compounds that are transported through the blood can also be released through your sweat glands. That can make your armpits and skin smell bad. It’s normal for stress to cause smelly compounds to be released through your sweat. But your armpits can smell for other reasons too. Both moisture and hair enable bacteria to thrive. These bacteria can make smelly compounds. Bathing, shaving, and deodorant can help keep these odors in check. Because certain diseases cause breath or body odors, NIH-supported researchers are developing an electronic “nose” to help doctors detect them. This research is at an early stage. In the lab, scientists can already analyze odor compounds from the body. They’ve even trained dogs to detect signs of certain cancers in breath samples. If you’re concerned about a new or worsening body odor, “a trip to the doctor for evaluation is always the first step,” Deming advises. “Bad breath is best assessed by a dentist.” Your dentist can examine your mouth for signs of trouble. If body odor is your concern, your doctor can conduct a physical exam. If needed, your doctor can suggest further tests. “A trial of avoiding foods that are known to cause body odor may be considered. In rare cases of body odor due to an underlying medical condition, the treatment of that condition may help to manage the odor as well,” Deming says. See the Wise Choices box for some ways to prevent strong breath and body odors.

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Why is my body producing strong sweat odour?

Sweating and body odor are common when you exercise or you're too warm. They're also common when you're feeling nervous, anxious or stressed. Unusual changes in sweating — either too much (hyperhidrosis) or too little (anhidrosis) — can be cause for concern. Changes in body odor also may signal a health problem.

mayoclinic.org - Sweating and body odor - Symptoms and causes - Mayo Clinic

Overview

Symptoms

Some people naturally sweat more or less than other people. Body odor also can vary from person to person. See a doctor if:

You suddenly begin to sweat much more or less than usual

Sweating disrupts your daily routine

You experience night sweats for no apparent reason

You notice a change in your body odor

Causes

Sweating and body odor are caused by sweat glands in your body. The two main types of sweat glands are eccrine glands and apocrine glands. Eccrine glands occur over most of your body and open directly onto the surface of the skin. When your body temperature rises, these glands release fluids that cool your body as they evaporate. Apocrine glands are found in areas where you have hair, such as your armpits and groin. These glands release a milky fluid when you're stressed. This fluid is odorless until it combines with bacteria on your skin.

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