BODY ODOUR: A SIMPLE AND CONVERSATIONAL GUIDE | Dr Weriwoyingipre Silver Yeibake

Dr Weriwoyingipre Silver Yeibake

Body odour is something almost everyone experiences at some point. It can feel embarrassing or worrying, especially if people comment on it, but in most cases, it is not a disease—just sweat mixing with bacteria on the skin. In some people, however, strong or unusual smells can be a clue that something else is going on with their health.

​In this article, we’ll talk in everyday language about what body odour is, why it happens, when it may signal a medical problem, and what anyone can do at home to keep it under control. We’ll also look briefly at a few less common medical causes where the smell is more than just “sweat”.

​What body odour really is

​Body odour is the smell that comes from your skin when sweat and other secretions mix with the bacteria that normally live on your skin. Sweat by itself is usually odourless; the smell comes from those bacteria breaking down proteins and fats in sweat.

​Areas where sweat and warmth are trapped—like the armpits, groin, feet, under the breasts, and skin folds—often smell stronger than the rest of the body.

​Body odour is not a sign of being “dirty” or “weak”. It is a normal, natural process that can be influenced by hormones, diet, hygiene, and the clothes you wear.

​Why body odour develops

​Several things usually come together to create body odour.

​Your body has sweat glands, especially in the armpits, groin, and skin folds. When you sweat, that moisture sits on the skin and bacteria feed on it, producing smelly chemicals.

​At puberty, hormones change, the skin becomes oilier, and sweat glands become more active. That is why teenagers often notice stronger body odour, even if they wash regularly.

​Some foods and drinks—like garlic, onions, spicy food, curry, and alcohol—can pass into sweat and breath and make the smell stronger for a time.

​Poor hygiene or clothing choices can worsen odour: not washing regularly, ignoring sweaty areas, or wearing tight, synthetic clothes that trap sweat and heat all make it easier for bacteria to grow.

​Stress, being overweight, or having many skin folds can also increase sweating and make odour more noticeable.

​When body odour might mean a medical problem

​Most body odour is normal and harmless, but sometimes a sudden, very strong, or unusual smell can be a sign of an underlying health issue.

​For example, a sweet, fruity, or acetone-like smell on the breath or skin can be linked to uncontrolled diabetes, especially if the person also feels very thirsty, urinates often, or is losing weight quickly. In severe cases, this can be part of diabetic ketoacidosis, a dangerous emergency that needs urgent care.

​A musty, sweet-rotten, or fishy smell on the breath or skin can point to liver disease, often together with yellow eyes or skin, a swollen belly, or confusion.

​A urine-like or ammonia-like smell from the skin or breath can be linked to advanced kidney disease, especially if there is swelling in the legs, tiredness, or reduced urine output.

​Strong, unpleasant odour from the armpits, groin, or skin folds can also be due to bacterial or fungal infections, sometimes with redness, itching, or sores. A fishy-smelling, strong armpit odour that persists despite good hygiene may be trimethylaminuria (“fish-odour syndrome”), a rare condition where the body cannot fully break down a chemical made from certain foods.

​Similarly, some inherited metabolic disorders can change the way a person or their urine smells:

• ​In phenylketonuria (PKU), untreated children often have a musty or “mouse-like” smell on their sweat, breath, or urine; this is usually picked up by newborn screening and controlled with a special diet.
• ​Certain forms of tyrosinaemia can cause a musty or mousy smell along with poor feeding, vomiting, liver problems, and slow growth. These are usually diagnosed early in life.

​When body odour is strong, sudden, or different from the usual, and is linked to other symptoms (like fever, weight loss, yellow eyes, or poor feeding), it is wise to see a doctor for a check-up.

​Consequences of uncontrolled body odour

​Body odour may seem like a small issue, but it can affect more than just the body.

​Socially, it can lead to embarrassment, shame, teasing, or bullying, especially at school or work. People may avoid hugs, close contact, or group activities because they fear how they smell, which can damage friendships and self-confidence.

​In relationships, strong odour can cause tension, distance, or criticism, even if it is not spoken about directly. This can make a person feel isolated or anxious.

​If body odour is linked to an untreated medical condition—like diabetes, liver disease, kidney disease, infections, or rare metabolic disorders—delaying care can mean missing the chance to treat the problem early and prevent complications.

​How to manage body odour in everyday life

​Most people can keep body odour under control with simple, practical habits that feel normal:

• ​Wash regularly: Bathe or shower the whole body at least once a day, paying extra attention to the armpits, groin, under the breasts, feet, and skin folds. After sweating or exercise, wash those areas as soon as possible.
• ​Use deodorant or antiperspirant: Deodorants reduce bacteria and help mask smell; antiperspirants also reduce sweat. Apply them to clean, dry skin, usually in the morning and sometimes at night, following the product instructions.
• ​Wear breathable clothes: Choose loose, cotton or natural-fabric clothes that let the skin breathe. Avoid tight synthetic clothes that trap sweat and heat.
• ​Care for feet and groin: Change socks daily, and more often if you sweat a lot. Dry your feet well, especially between the toes. Use clean, breathable underwear and change it daily.
• ​Watch food and fluids: If you notice your smell becoming stronger after onion, garlic, spicy food, or alcohol, you can try cutting down and see if that helps. Drink enough clean water so your body and sweat stay balanced.
• ​Know when to see a doctor: Seek medical help if the smell is very strong, sudden, or unusual (sweet, fruity, urine-like, fishy, musty, or mouse-like) or if it comes with fever, weight loss, yellow eyes, swelling, unusual discharge, rash, or poor feeding.

​For children or teenagers, a doctor, school clinic, or adolescent-friendly clinic can check hygiene, puberty changes, and possible medical causes, and give clear, respectful advice.

​Common myths around body odour

​Many people believe things about body odour that are not true:

• ​Myth: “If you smell, you must be dirty or lazy.”
  • ​Truth: Even very clean people can have strong body odour because of hormones, genetics, or medical conditions. Good hygiene and deodorant help, but smell does not mean “dirty”.
• ​Myth: “Only teenagers have body odour.”
  • ​Truth: Children and adults of all ages can have body odour. It depends on sweat, bacteria, hormones, and hygiene, not just age.
• ​Myth: “Spraying lots of perfume will fix it.”
  • ​Truth: Strong perfume can mix with sweat and bacteria, sometimes making the smell worse. A better approach is good hygiene, deodorant, and breathable clothes, with a mild fragrance if desired.
• ​Myth: “Body odour is always a sign of disease.”
  • ​Truth: Most body odour is normal. Only when it is very strong, sudden, or linked to illness does it need a medical check.

​What parents and caregivers can do

​Parents can help children and teenagers by talking gently and openly about body changes, sweat, and hygiene, without making them feel “bad” for smelling.

​Teach daily washing, deodorant use, and wearing clean clothes as normal, healthy habits. If a child or teen feels deeply embarrassed or bullied because of body odour, offer to see a doctor together and support them emotionally.

​In simple terms

​Body odour is usually normal and harmless, created when sweat mixes with bacteria on the skin. With good hygiene, sensible deodorant use, breathable clothes, and a healthy diet, most people can keep it under control.

​But strong, sudden, or unusual smells can sometimes signal medical problems like diabetes, liver or kidney disease, infections, or rare metabolic disorders such as trimethylaminuria, tyrosinaemia, or phenylketonuria. In these cases, early medical care can treat the underlying cause and improve both health and confidence.

​By understanding body odour in a simple, non-shaming way, families and communities can support children and adults to feel clean, healthy, and comfortable in their own skin.

​References

1. ​NHS UK – Body odour (BO) Body odour (BO), symptoms and treatment. NHS, last reviewed 14 May 2025.
2. ​Mayo Clinic – Sweating and body odor Sweating and body odor – Symptoms & causes. Mayo Clinic, updated 2 May 2025.
3. ​Cleveland Clinic – Body Odor Body Odor: Causes, Changes, Underlying Diseases & Treatment. Updated 29 August 2023.
4. ​Microbiota and Malodor – Etiology and Management (2020) Microbiota and Malodor – Etiology and Management. Biomedicines, 2020 (free full-text review).
5. ​Microbial Origins of Body Odor – American Society for Microbiology (2021) Microbial Origins of Body Odor. American Society for Microbiology, 2021.
6. ​Trimethylaminuria – Review (2024) Exploring Trimethylaminuria: Genetics and Molecular Mechanisms, Epidemiology, and Emerging Therapeutic Strategies. Biology (Basel), 2024.
7. ​Case Report on Tyrosinaemia and PKU (2022 research line) Coexistence of phenylketonuria and tyrosinemia type 3. (Case-based literature citing 2021–2022 data).
8. ​Phenylketonuria – Contemporary Review (2020) Phenylketonuria: a review of current and future treatments. PMC / NCBI (2020).
9. ​Phenylketonuria – OBM Genetics Narrative (2024) Phenylketonuria—Past, Present, and Future Directions. OBM Genetics, 2024.
10. ​Recent Advances in Phenylketonuria (2023) Recent Advances in Phenylketonuria: A Review. Cureus, 2023.