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What causes stinky scalp?

Having a stinky scalp can be an embarrassing and frustrating problem. A buildup of dirt, oil, and dead skin cells on the scalp can lead to an unpleasant odor. This condition is also known as smelly scalp syndrome. Understanding what causes smelly scalp can help you find the right treatment to get rid of the odor and prevent it from coming back.

What is a stinky scalp?

A stinky scalp refers to a scalp that has an offensive odor. This is often described as smelling sour, rancid, or like rotten eggs. The medical term for a smelly scalp is bromodosis. While bromodosis can affect any part of the skin, it most commonly occurs on the scalp.

Some of the common symptoms of smelly scalp syndrome include:

  • An unpleasant odor coming from the scalp and hair
  • Greasy, oily scalp and hair
  • Itchy scalp
  • Flaky or scaly scalp
  • White flakes in the hair and on clothing
  • Redness or irritation on the scalp

The odor is often worse after sweating or when the scalp and hair get wet. For some people, the smelly scalp odor may come and go, while for others it is a constant problem.

What causes a smelly scalp?

There are several possible causes of a stinky scalp:

Overactive sebaceous glands

The sebaceous glands in your scalp produce an oily substance called sebum. This helps moisturize the scalp and keep hair healthy. However, for some people these glands are overactive and produce too much sebum. The excess oil mixes with dead skin cells and bacteria, leading to a foul odor.

Hormonal changes

Hormonal fluctuations during puberty, menstruation, pregnancy, and menopause can increase sebum production and sweat, making bromodosis more likely. The hormonal changes during puberty explain why smelly scalp is common in teenagers.

Poor hygiene

Not washing the hair and scalp regularly allows dead skin cells, oil, and sweat to build up. This creates the ideal environment for odor-causing bacteria to thrive.


The yeast Malassezia feeds on sebum and is linked to dandruff. As it metabolizes the oils on your scalp, it releases oleic acid as a byproduct. This acid has a very unpleasant scent, contributing to a smelly scalp.

Bacterial overgrowth

There are over 1000 species of bacteria that live on the scalp. When the populations of odor-producing bacteria like Proteus or Pseudomonas grow out of control, it can cause a foul sour smell.

Fungal infections

Ringworm is a contagious fungal infection that can infect the scalp. Along with itchy red patches, ringworm has a characteristic musty odor. Other fungal infections like tinea versicolor can also lead to a smelly scalp.

Medical conditions

Certain medical conditions are associated with bromodosis, including hyperhidrosis (excessive sweating), Parkinson’s disease, diabetes, kidney disease, and liver disease. The increased sweat, oil, and skin cell turnover can make body odor more likely.


Chemicals from cigarette smoke get transferred to the scalp through the bloodstream. This can change the pH and odor of the scalp.

Hair products

Certain hair care products like heavy conditioners, styling products, and oils can stick to the scalp and promote bacterial growth. Buildup from hair products and minerals in hard water contribute to scalp odor.

How to get rid of smelly scalp

If you are struggling with an unpleasant scalp odor, there are several effective home remedies and medical treatments to help:

Shampoo regularly

Washing your hair at least every other day will help rinse away dirt, dead skin cells, excess oil and bacteria from the scalp. Use a clarifying shampoo containing salicylic acid or alpha hydroxy acids to deep cleanse the scalp. Make sure to really scrub the shampoo into your roots.

Apple cider vinegar rinse

The mild acidity of diluted apple cider vinegar helps restore the natural pH of the scalp, inhibiting bacterial growth. It also acts as an antimicrobial to control dandruff. After shampooing, rinse your hair with a mix of 1 part apple cider vinegar to 3 parts water.

Tea tree oil

Tea tree oil is a natural antifungal and antimicrobial ingredient. Add a few drops of tea tree essential oil to your shampoo or mix it with coconut oil and massage into the scalp before showering. This can help control scalp odor caused by fungal or bacterial overgrowth.


Gently scrubbing the scalp with a brush or your fingertips helps slough away dead skin cells. Follow up with an apple cider vinegar rinse to dissolve any leftover debris. Don’t over-exfoliate though, as this can worsen irritation.

Scalp masks

Applying a targeted scalp mask 1-2 times per week pulls double duty by exfoliating and treating the scalp. Look for masks with ingredients like salicylic acid, sulfur, honey, tea tree oil, peppermint oil, or charcoal. Rinse the mask out thoroughly after 5-10 minutes.

Medicated shampoos

If over-the-counter methods aren’t working, see your doctor or dermatologist for prescription strength medicated shampoos. These contain active ingredients like ketoconazole, selenium sulfide, or pyrithione zinc to reduce fungal overgrowth, inflammation, flaking, and odor.

Oral antibiotics

For severe or recurrent cases of smelly scalp caused by an overgrowth of bacteria, your doctor may prescribe oral antibiotics to treat the underlying problem. Antibiotics help clear up bacterial infections and restore the natural balance of microorganisms on the scalp.

Steroid creams

Inflammation from skin conditions like eczema or psoriasis can contribute to scalp odor. Steroid creams and ointments help calm inflammation and reduce odor. But long term steroid use can thin the skin, so work closely with your dermatologist.

Isotretinoin pills

If smelly scalp is caused by excess sebum production, your doctor may recommend oral isotretinoin pills. This prescription medication shrinks the oil glands and greatly reduces sebum secretion. However, isotretinoin has many potential side effects and can only be used under close medical supervision.

Oral antifungals

For severe, recurring fungal infections of the scalp, oral antifungal medications like terbinafine or itraconazole might be prescribed. Antifungal pills treat fungal overgrowth from inside the body. Topical shampoos should be used at the same time.

Botox injections

Multiple studies have found that injecting botulinum toxin (Botox) into the scalp can temporarily reduce oil production and sweating. Botox injections for smelly scalp generally need to be repeated every 3-4 months for ongoing results.


If no other treatments resolve a severely smelly scalp, surgery is an option to remove the sweat or oil glands causing the odor. Scalp reduction surgery removes sections of the scalp with overactive glands. Curettage surgery scrapes away the top layers of the skin including oil and sweat glands. Both procedures are invasive and carry risks of infection and scarring.

Tips for preventing smelly scalp

Making some simple lifestyle changes can go a long way towards stopping smelly scalp before it starts:

  • Wash hair daily or every other day
  • Limit use of hair products
  • Avoid heavy hair oils and pomades
  • Shampoo twice to remove product buildup
  • Alternate medicated shampoo with regular shampoo
  • Let hair air dry instead of blow drying
  • Don’t wear hats for prolonged periods
  • Stay hydrated to limit excess sweating
  • Manage stress to reduce oil production
  • Eat a balanced diet to avoid hormonal fluctuations
  • Take oral or topical antibiotics as prescribed
  • See your doctor regularly to treat underlying conditions

Making scalp grooming and hygiene a priority will go a long way towards preventing smelly scalp syndrome. See your dermatologist if home care strategies don’t resolve the issue. With consistent treatment, you can have healthy, odor-free hair.

When to see a doctor

You should make an appointment with your doctor or dermatologist if:

  • Scalp odor persists despite good hygiene
  • Odor is accompanied by redness, swelling, sores, or itching
  • You notice hair loss or breakage
  • Dandruff shampoo and home remedies don’t help
  • Odor worsens or comes back quickly after washing
  • You have an underlying condition like diabetes or hyperhidrosis

A skin evaluation can identify or rule out issues like ringworm, folliculitis, seborrheic dermatitis, psoriasis, eczema, and other medical causes of odor. Based on the diagnosis, your doctor will recommend prescription antifungal or antibiotic medications if needed. For long-standing cases, blood tests may be ordered to check for hormonal imbalances. Be prepared to answer questions about your hair washing routine, products used, and any other symptoms you’re experiencing.

Don’t be embarrassed to bring up scalp odor with your doctor. Smelly scalp is a common issue and addressing any underlying medical condition is important. With professional treatments, most cases of smelly scalp and hair can be cured.

Coping with smelly scalp

Dealing with an unpleasant scalp odor can take an emotional toll. Here are some tips for coping while you work to get rid of smelly scalp:

  • Ask friends or family to honestly describe the odor – you may be more aware of it than others.
  • Be meticulous about scalp hygiene and grooming to minimize odor.
  • Try natural remedies like apple cider vinegar rinses and essential oils.
  • Cover hair with scarves or hats if needed for social events.
  • Avoid cigarettes and smoke which exacerbate scalp odor.
  • Use dry shampoo between washes to soak up oil and sweat.
  • Volumize hair away from your scalp to allow more airflow.
  • Make an appointment with your doctor to discuss treatment options.
  • Join support groups to exchange advice and tips with others struggling with smelly scalp and bromodosis.

Coping with smelly scalp syndrome takes patience and perseverance. But with a combination of hygiene, lifestyle changes, home remedies and medical treatment, you can gain control over scalp odor. Don’t lose hope – solutions are available to help you feel confident and comfortable again.

Frequently asked questions about smelly scalp

Why does my scalp smell so bad even right after washing?

Even with regular shampooing, some people still experience an odor right after washing their hair. This is typically caused by the growth of bacteria faster than it can be washed away. Skin conditions like seborrheic dermatitis, psoriasis, and dandruff can also contribute to rapid odor recurrence after washing. Using medicated shampoo several times per week can help better control scalp bacteria and irritation.

Can lice or nits cause a smelly scalp?

Head lice attach to hair and feed on scalp blood several times per day. This can lead to increased irritation and itching of the scalp. As dead lice and waste products build up in the hair, they can give off a characteristic foul, musty odor. Successfully treating and removing all traces of lice is key to resolving the scalp odor.

Why does my scalp smell like mildew or mold?

A fungal overgrowth is a common source of mildew-like scalp odor. Ringworm in particular has a distinctive damp, moldy smell. Scalp fungus thrives in the moist, dark environment under hair. Using antifungal shampoo and taking oral antifungals can clear up this smell by treating the underlying fungal infection.

Can smelly scalp be cured permanently?

For some people, smelly scalp is a lifelong condition that requires ongoing management. But identifying and properly treating the underlying cause of scalp odor provides the best chance of a permanent cure. This may require adjusting hair care routines, taking medications, and managing related conditions like hyperhidrosis or hormonal disorders. With a multilayered approach, permanent elimination of smelly scalp is possible.

Is smelly scalp a sign of poor hygiene?

While poor hygiene can certainly worsen scalp odor, it is not the only cause. Even with diligent hair washing, medical conditions like overactive oil glands, bacterial overgrowth, fungal infections, dandruff, and other issues can cause unpleasant scalp odor. Don’t assume someone with smelly scalp has poor hygiene – there are many other potential explanations.


Smelly scalp is a frustrating issue, but identifying the underlying cause is the critical first step towards finding an effective solution. Pay close attention to any accompanying symptoms and talk to your doctor about both topical and oral treatment options. Consistent good hygiene, targeted hair care, and medical treatments as needed can help cure a stinky scalp once and for all. With a multifaceted approach, you can have healthy, odor-free hair restored.