Ear Infection Red Flags and Prevention
The warning signs that mean stop waiting, why diabetes changes the answer, and the prevention that works versus the prevention that does not.
Part of the Complete Ear Infection Guide.
Key fact: The warning sign that matters most is behind the ear, not in it. Swelling, redness or tenderness over the bone behind the ear, or an ear that is being pushed outwards, can mean mastoiditis — and that is a same-day problem.
Swelling behind the ear
The mastoid is the bony prominence just behind the ear. Infection spreading from the middle ear into it is uncommon, but it is the classic serious complication and it is recognisable.
- Swelling, redness or tenderness behind the ear, over the bone
- The ear pushed forwards and outwards, which is easier to see by comparing both sides from behind
- Pain that is getting worse rather than settling, often after several days of earache
- Fever and a person who is clearly unwell
- Sometimes discharge from the ear beforehand
This needs same-day assessment. Mastoiditis is treated in hospital with intravenous antibiotics and sometimes surgery, and it is the reason earache that is worsening after several days is not simply waited out.
Facial weakness
The facial nerve runs through the bone of the middle ear. Infection can affect it, producing weakness on one side of the face — a drooping mouth, an eye that will not close, or an uneven smile.
Facial weakness with earache needs urgent assessment. And facial weakness of sudden onset, especially with arm weakness or difficulty speaking, means call 999 — that is a stroke until proven otherwise, regardless of any ear symptoms.
Severe headache, neck stiffness or confusion
- Severe headache that is different from usual
- Neck stiffness, or dislike of bright light
- Confusion, drowsiness, or being difficult to rouse
- Repeated vomiting
- Severe dizziness or the room spinning, particularly with hearing loss
- A rash that does not fade when pressed with a glass
These raise the possibility of infection spreading inside the skull — meningitis, a brain abscess or a clot in one of the venous sinuses. All are rare and all are emergencies. Call 999 for a non-fading rash, difficulty breathing, confusion, or a child who is floppy or very hard to wake.
Diabetes and weakened immunity
Earache in someone with diabetes, or a weakened immune system, is assessed rather than self-treated. Necrotising otitis externa — infection spreading from the ear canal into the surrounding bone — occurs almost exclusively in these groups, particularly older adults with diabetes. The warning signs are severe, persistent, often night-time ear pain out of proportion to what is visible, discharge that does not settle, and pain that continues despite drops.
It is treated with prolonged antibiotics under specialist care, and outcomes depend heavily on how early it is recognised. This is the single strongest reason not to manage ear pain at home in these groups.
Children
- Under 12 months with earache should be seen
- A child who is unusually drowsy, floppy, or very difficult to settle needs urgent assessment
- Repeated vomiting, or refusing all fluids
- A very high temperature, or a temperature with a child who seems seriously unwell
- Balance problems or unsteadiness
- Recurrent infections — several in a short period is worth reviewing rather than treating each in isolation
Hearing that does not come back
Muffled hearing for days or weeks after an ear infection is expected while fluid clears. What is not expected:
- Hearing loss persisting for months, particularly in a child after repeated infections — this may be glue ear, which is assessed with a period of watchful waiting before any intervention, because most resolves
- Sudden hearing loss in one ear without an obvious infection, which is a same-day problem in its own right
- Hearing loss with severe dizziness
- A child whose speech or schoolwork is affected, which is the practical reason glue ear gets followed up
When to act, at a glance
| Timeframe | Situation |
|---|---|
| 999 | Confusion or drowsiness, non-fading rash, difficulty breathing, sudden facial or limb weakness, a child who is floppy or very hard to rouse |
| Same day | Swelling or redness behind the ear, ear pushed outwards, facial weakness, severe headache or neck stiffness, repeated vomiting, severe dizziness, very high temperature, earache with diabetes or immunosuppression |
| Prompt appointment | Earache lasting more than 3 days, under 12 months old, discharge that is not settling, symptoms worsening rather than improving, recurrent infections |
| Routine | Hearing still reduced weeks later, or repeated infections worth reviewing as a pattern |
Preventing outer ear infection
- Nothing smaller than your elbow — no cotton buds, fingers, hairgrips or paperclips. This is the single most effective measure
- Dry the ears after swimming or showering — tilt the head each way and let them drain, or use a hairdryer on the lowest setting held well away
- Leave the wax alone. It is slightly acidic and water-repellent, and it is part of the canal's defence
- Consider well-fitting swimming earplugs or a cap if you swim regularly and are prone to it
- Keep shampoo and soap out, which strip the protective layer
- Treat eczema or psoriasis in the canal, since inflamed skin is easily infected
- Clean hearing aids and earplugs, and give the ears time without them
Reducing middle ear infections
- Keep childhood immunisations up to date — several reduce the bacteria behind middle ear infection
- Avoid smoke exposure, which measurably increases ear infections in children
- Feed babies upright rather than lying flat with a bottle
- Breastfeeding is associated with fewer episodes in infancy
- Manage nasal allergy, which contributes to the blocked drainage behind it
- Accept that some are unavoidable — they follow ordinary colds, and small children have a great many colds
What does not prevent them: cleaning the ears, avoiding getting the head wet in the bath, or keeping a child indoors in cold weather. Middle ear infection comes from the nose, not from the outside of the ear.
Frequently Asked Questions
When is an ear infection an emergency?
Swelling, redness or tenderness over the bone behind the ear, or an ear pushed outwards, needs same-day assessment because it can mean mastoiditis. So does facial weakness, severe headache, neck stiffness, confusion, repeated vomiting or severe dizziness. Call 999 for confusion, a non-fading rash, difficulty breathing or a child who is floppy or hard to rouse.
Why is earache more serious if you have diabetes?
Necrotising otitis externa, where infection spreads from the ear canal into surrounding bone, occurs almost exclusively in people with diabetes or a weakened immune system, particularly older adults. Warning signs are severe persistent pain out of proportion to what is visible, often worse at night, with discharge that does not settle. Earache in these groups is assessed rather than self-treated.
How long should earache last before I see someone?
See a GP if earache lasts more than 3 days, if the person is under 12 months old, if symptoms are worsening rather than improving, if discharge is not settling, or if infections keep recurring. Most ear infections settle within about 3 days and can last up to a week.
Is it normal for hearing to stay muffled after an ear infection?
For days or weeks, yes, while fluid clears from behind the eardrum. Hearing loss persisting for months, particularly in a child after repeated infections, may be glue ear and should be assessed. Sudden hearing loss in one ear without an obvious infection is a same-day problem in its own right.
How do I stop getting swimmer's ear?
Keep everything out of the ear canal, including cotton buds, and dry the ears after swimming or showering by tilting the head each way and letting them drain. Leave the wax alone, because it is water-repellent and protective. Well-fitting swimming earplugs or a cap help if you swim regularly and are prone to it.
References
- NHS. Ear infections. nhs.uk
- National Institute for Health and Care Excellence. Otitis media (acute): antimicrobial prescribing (NG91). nice.org.uk
- National Institute for Health and Care Excellence. Otitis externa: antimicrobial prescribing (NG98). nice.org.uk
- Electronic Medicines Compendium. Otigo 40mg/10mg/g ear drops: Summary of Product Characteristics. medicines.org.uk
- NHS England. Pharmacy First: acute otitis media patient group direction. england.nhs.uk
Medical disclaimer: This article is for informational purposes only and does not constitute medical advice. Ear drops are not interchangeable, and some must never be used if the eardrum may be perforated. A rapidly worsening earache, swelling behind the ear or facial weakness needs urgent assessment. Always consult a qualified healthcare professional for diagnosis and treatment. In a medical emergency, call 999.