Your boyfriend might smell like onions due to sulfur-rich foods (garlic, onions, cruciferous veggies) being released through sweat, apocrine sweat gland activity breaking down proteins with skin bacteria, high stress, hormonal shifts, certain medications, or digestive issues, but a doctor visit is best to rule out underlying conditions like zinc deficiency or infections.
Your body hosts all kinds of bacteria, and some love to munch on the sweat we produce. These tiny organisms feed on the proteins and fatty acids in your sweat, and as they break them down, they can create an armpit smell like onions. Garlic and onions are sulfur-rich and can give bacteria a feast.
Bromhidrosis is a medical condition characterized by an abnormally offensive body odor (B.O) that often reminds of onions or sulfur. The odor results from the interaction between sweat and skin bacteria, particularly when sweat contains high levels of lipids and proteins.
Phantosmia refers to detecting smells that aren't really there. It's a symptom of many common conditions, including allergies, colds and upper respiratory infections. It could also indicate a brain-related condition, including epilepsy, stroke or Alzheimer's disease.
Diabetes: Diabetes is one of the most well-known health conditions linked to changes in body odor. People with uncontrolled diabetes can experience a fruity or acetone-like smell (think nail polish remover) on their breath or skin.
They release a thicker, protein-rich fluid that bacteria love. When those bacteria break it down, they produce that telltale oniony smell. Hormonal shifts — think puberty, intense stress, or even certain medications — can also ramp up sweat production, making the smell more noticeable.
A strong onion smelling vaginal odor accompanied by a thick yellow discharge can generally indicate a Sexually Transmitted Infection (STI) like Trichomoniasis, Gonorrhea, or Chlamydia. Symptoms may also include vaginal itching and discomfort during urination.
Certain medical conditions, including kidney or liver disease, can lead the body to release waste products through sweat, producing a vinegar-like odor. Dehydration can further intensify these smells by concentrating the chemicals present in sweat.
Conditions like kidney disease, diabetes or hyperhidrosis can affect how your body processes waste, leading to an intense ammonia smell. It's essential to tune into your body's signals and consult with a healthcare professional if you suspect your sweat's scent is more than just a dietary or exercise-related quirk.
If your kidneys aren't working properly, you may notice one or more of the following signs:
Medical conditions, such as hyperhidrosis (excessive sweating) or infections, can also be culprits of sour-smelling perspiration. Go see a doctor if you're concerned.
Later in life, hormonal shifts—particularly during menopause in women—can also affect body odor. Decreasing estrogen levels in women can alter sweat production and lead to shifts in body odor that may seem stronger or different. Changes in Skin Composition: As we age, our skin's composition changes.
Night sweats are generally harmless, but excessive sweating at night can be caused by low testosterone levels, sleep apnea, stress, hormones, medications, and infections. If night sweats regularly interfere with your sleep, a doctor can help to diagnose and treat underlying causes.
The Culprits Behind Yellowing Sheets
Our bodies produce oils and sweat and shed dead skin cells, which all find their way into the fabric of our sheets. Over time, these residues build up and cause that unsightly yellow hue we're all too familiar with.
The component is androstenone, a steroid derived from testosterone that is present in sweat. To some people, androstenone smells pleasant, with a sweet, floral, or vanilla-like scent. Others find the compound's odor offensive and liken it to sweat or urine. A third group can't even smell the compound.
Thioalcohols get their stinky odor from sulfur and, despite being present in only trace amounts, are some of the most pungent VOCs produced. 3-methyl-3-sulfanylhexan-1-ol (3M3SH) is a thioalcohol, produced by Staphylococcus hominis, which makes the underarms smell like rotten onions or meat.
According to Dr. Shirazi, there's also a condition called bromhidrosis—where the bacteria on your skin breaks down the sweat and causes a sulfur or onion-y smell. “This odor is more powerful than ordinary sweat,” she adds.
Recurring nasal blockage and unusual odors can indicate sinus infections or nasal polyps. A persistent stuffed nostril with a recurring onion-like smell may suggest sinus infection, nasal polyps, or chronic inflammation. These conditions can cause mucus buildup and altered odor perception.
An onion-like vaginal odour is not typical and may indicate a sexually transmitted infection (STI). While all vaginas have a natural scent that can vary due to hormones, sexual arousal, menstruation, or pregnancy, lifestyle factors like diet and exercise can also impact vaginal odour.
Changes in body odor can be a normal part of development, such as when an adolescent is going through puberty. Phantom Smells, such as odd, strong, acrid, metallic, blood-like, sour, ammonia-like, acidy, and repugnant smells, to name a few, are common anxiety disorder symptoms.
Some women describe their menopause body odour as smelling like urine, and even cat pee, which could be caused by excess ammonia due to increased amounts of apocrine sweat. Aside from body odour, you may also experience 'phantom smells', such as smoke.
Night sweats can be a symptom of several types of cancer, including:
One possible cause of night sweats in men is low testosterone, which can be identified via a simple blood test. It's a hormonal condition that becomes more common as men age. Low testosterone has been linked to being overweight and to Type 2 diabetes.
Hormone disorders—Night sweats can be a result of problems in the hormone-producing glands (endocrine system). If a person receives too much or too little of a hormone, such as serotonin, it can result in flushing and sweating.
Without enough B12, your metabolism can slow down, leading to more odor-causing byproducts being released through your sweat. Plus, B12 helps maintain healthy skin, which acts as a barrier to bacteria that cause bad smells. You can find B12 in foods like meat, eggs, and dairy, or through supplements.