Why Do My Armpits Still Smell After a Shower? Medical Reasons Explained
Armpit odour after showering commonly comes from skin bacteria breaking down sweat and other substances on the skin. It can happen even with good hygiene and does not automatically mean you have an internal illness.
Sweating and odour retained in clothing can contribute. If simple changes are not helping, or the smell or sweating pattern changes noticeably, seek medical advice.
Why can the smell return after washing?
Skin bacteria and sweat
Fresh sweat is usually odourless. Smell develops when bacteria break down sweat and skin substances. Washing does not permanently remove the skin’s normal bacteria.
Odour held in clothing
Odour can cling to fabric. Putting a shirt back on may make the smell noticeable again, even after you have washed your underarms.
Excessive sweating
Hyperhidrosis means sweating more than your body needs for cooling. It can affect the underarms alone or several areas and may contribute to persistent odour.
Skin conditions
Local skin infections can contribute to odour. A rash, soreness or other visible change is a reason to have the skin examined rather than repeatedly changing deodorants.
What can you try first?
- Wash your underarms regularly and dry them thoroughly.
- Use an antiperspirant according to its instructions. Antiperspirants reduce sweating; deodorants mainly control or mask odour.
- Change and wash clothes regularly. Try loose, breathable fabrics.
- Ask a pharmacist about stronger antiperspirants or gentler washing products if your skin is sensitive.
Avoid harsh scrubbing or applying products that irritate your skin.
When should you see a doctor?
Arrange a review if self-care is not helping, particularly if:
- The odour changes noticeably.
- You suddenly sweat much more than usual.
- Sweating happens at night or disrupts daily life.
- The problem affects your confidence or wellbeing.
- You have other symptoms or recently started a medicine.
Excessive sweating can occur without an underlying illness, but medicines and some medical conditions can also cause it. Do not stop prescribed medication without discussing it with your clinician.
Do you need blood tests for body odour?
Not everyone does. Assessment starts with your symptoms, medicines, sweating pattern and a skin examination. There is no single blood test that explains every case of underarm odour.
If the assessment suggests an underlying condition, a clinician may recommend targeted tests. Broad vitamin, hormone, liver or kidney panels should not be the automatic first step for isolated armpit smell.
Depending on the cause, treatment may focus on antiperspirants, a skin condition or excessive sweating. Persistent problems may benefit from a dermatology assessment.
Fruity breath with illness needs urgent attention
This is different from ordinary armpit odour. Fruity-smelling breath together with marked thirst, frequent urination, vomiting, deep breathing, drowsiness or confusion can indicate diabetic ketoacidosis.
Call 999 or go to A&E if you have symptoms of diabetic ketoacidosis, even if you have not been diagnosed with diabetes. Do not wait for a routine blood test.
Quick answers
Does this mean I am not washing properly?
No. Odour can persist despite regular washing. Sweat, skin bacteria and clothing can all play a role.
Can hormones or medicines affect sweating?
Yes. Hormonal changes and some medicines can influence sweating or body odour. Mention any recent changes during your review.
Should I buy a vitamin test?
Underarm odour alone is not enough to identify a vitamin deficiency. Discuss your symptoms before choosing tests or supplements.
Can persistent sweating be treated?
Yes. Options include stronger antiperspirants and, when needed, specialist treatments. The appropriate approach depends on the cause.
Discuss persistent symptoms with MDC
If underarm odour or sweating continues to concern you, contact Marylebone Diagnostic Centre to discuss the appropriate appointment and any investigations recommended by a clinician.
73 Baker Street, London W1U 6RD
Appointment availability, fees and any test turnaround
times will be confirmed before booking.
Clinical sources
This information supports, and does not replace, an individual medical assessment.
