Teething or Sick? 7 Signals That Separate the Two

Teething makes a baby warm and miserable, which is exactly why it gets blamed for infections it never caused. Here is the line that matters, seven signals ranked by reliability, and a three-day log you can hand to a clinician.

Checked against NHS, AAP and FDA guidance · Published 11 November 2026 · About 15 min read

Educational information, not a diagnosis. It cannot replace an examination. Emergency thresholds and medicine strengths differ by country — follow your local health service and the product label. When in doubt, call your clinician; that call is never the wrong move.

The one line to hold onto: teething can raise a baby's temperature slightly, but it does not produce a true fever. At 38.0°C (100.4°F) and above, assume something else is going on.

36.5°C38.0°C40.0°C

Below 38°C — consistent with teething: a mild rise, a flushed cheek, sore gums.

38°C and above — treat as illness until a clinician says otherwise.

Every parent meets the same moment: a baby who is drooling, waking at night, chewing a fist, and feels slightly warm. Is a tooth coming, or is something wrong?

The confusion is not a failure of parental intuition. It is built into the calendar. Teething usually begins around six months, at almost exactly the point when maternal antibodies fade, when many babies enter group childcare, and when routine vaccinations are given. Four different causes of a warm, miserable baby arrive in the same weeks.

So the useful question is not "does teething cause fever?" — the answer to that is settled and short. The useful question is "which of these signs fit together?" A single symptom rarely decides it. A pattern usually does.

What teething actually does — and what it does not

Teething is a local process: a tooth bud pushing through gum tissue, with localised inflammation at that spot. The symptoms follow from that, which is why they are local, mild and short-lived.

Consistent with teething

Sore, red, swollen gum over the erupting tooth, sometimes a visible ridge
Noticeably more drooling; drool rash on chin, cheeks, neck and chest
Strong urge to bite, gnaw, suck — fingers, toys, your shoulder
Mild irritability and clinginess; lighter sleep
One flushed cheek
A slightly raised temperature, below 38°C
Rubbing the ear or face
Starting 3–5 days before the tooth shows, peaking in the 24–72 hours around eruption, then easing

Not teething — look elsewhere

Fever of 38°C or above
Diarrhoea or vomiting
A rash beyond the drool area — especially on the trunk, palms or soles
Runny nose, cough, noisy or fast breathing
Persistent refusal to feed, or refusing all fluids
Lethargy, floppiness, unusual stillness
Inconsolable crying that comfort cannot touch
Anything still worsening after 3–5 days

The two words doing the work here are local and brief. Teething pain is inflammation in one small patch of gum, and it rises and falls within days. An infection is systemic and tends to escalate day by day. A "teething episode" that has lasted a week and is worse today is not a teething episode.

Side by side: teething, ear infection, viral illness

This table is a thinking tool, not a diagnostic test. Its purpose is to help you describe, on the phone or at the desk, exactly which row does not fit.

Comparison of teething, acute otitis media and viral illness including hand, foot and mouth disease
What you observe	Teething	Acute ear infection	Viral illness (incl. HFMD)
Temperature	Slightly raised, under 38°C	Often 38°C or higher, can spike suddenly	Commonly 38–39°C
Onset	Gradual, 3–5 days before eruption	Fairly quick, typically 1–3 days after a cold	Quick, fever and rash or sore throat within 1–2 days
Drooling	Clearly increased, clear saliva	Not usually increased	May increase if swallowing hurts
Stool	No evidence of change	Not typical unless gut infection too	Diarrhoea and vomiting can occur
Rash	Drool rash only: chin, cheeks, neck; flat, ill-defined	None	HFMD: blisters or red spots on palms, soles, mouth, buttocks
Ears	Rubs or pulls ear, without fever; stops when distracted	Pulls or bats at the ear, with fever; worse lying flat	May tug at ears from throat pain, with other symptoms
Feeding	Wants to chew; takes slightly less food but still drinks	Pain on sucking: latches, then pulls off crying	Mouth ulcers: refuses feeds, drools, may go hours without drinking
Mood	Fretful but consolable; responds to you	Fussy, worse at night, reasonable by day	Lethargic, sleepy, or unusually still; hard to engage
Course	3–5 days, eases as the tooth appears	Can persist or worsen without treatment	5–7 days; HFMD rash fades over 7–10 days
What helps	Cold teether, gum pressure, upright cuddling	Sitting up may ease it; sucking makes it worse	Fever settles, but mouth pain continues

Two cautions. First, ear tugging alone tells you very little — NHS lists ear rubbing among ordinary teething signs. Second, "happy again once the fever drops" is a genuinely reassuring sign; what matters more than the number is what the baby does between temperatures.

The seven signals, ranked by how much they actually tell you

Read them in this order. The first two carry the most weight; the last two are supporting evidence, not deciding votes.

01strongest

The height and shape of the temperature curve

Teething nudges temperature up; it does not push it to a fever. Use one thermometer, one site, and record the peak across 24 hours rather than a single reading. Teething gives a low, flat wobble. Infection tends to climb from reading to reading.

02strong

Whether the timing matches the gum

Look inside the mouth. A defined red, swollen patch with a hard ridge under it, matching symptoms that began three to five days ago, supports teething. Whole-mouth redness, or a "tooth" that has been coming for two weeks and is worse today, does not.

03strong

Where the rash is, and what it looks like

Drool rash stays where saliva sits: chin, jawline, neck creases, upper chest. It is flat, blotchy, and blanches when pressed. Rash on the trunk, palms or soles, or anything blistering, is not a drool rash and needs a look.

04reliable

Willingness to drink

A teething baby chews the spoon and fusses, but still takes milk when hungry. Ear infection classically hurts on suction: a few sucks, then a pull away and a cry. Mouth ulcers stop feeding altogether. Wet nappies are the practical measure: fewer than 3–4 in 24 hours is a reason to call today.

05reliable

Stool changes

There is no evidence that teething causes diarrhoea. NHS states this plainly, and its medicines guidance lists diarrhoea and raised temperature as symptoms with another cause. Treat loose stools as a gut issue: count them, note texture, watch for blood, vomiting and reduced urine.

06supporting

Ears plus posture

Ear rubbing on its own is close to meaningless. The combination that matters is fever + ear pulling + a recent cold + worse when lying flat + crying during feeds. Three or more together, and the ear canal should be looked at rather than waited on.

07supporting

What happens after comforting

Teething misery has an edge to it: upright carrying, a walk outside, a cold teether, and the baby settles and re-engages. With fever and dehydration, crying may be unconsoleable — or the opposite, an unusually quiet baby who will not wake properly. The quiet version is the more dangerous one.

Three tiers: watch, call today, go now

Instead of memorising ten warning signs, sort what you are seeing into one of three buckets.

Watch at home

Teething pattern

Sore gum, drooling, chewing, mild fussiness
Temperature below 38°C, settling between episodes
Drinking normally, wet nappies unchanged
Consolable, interested in you and in play

Call today

Needs a clinician's view

Fever of 38°C or above in a baby over 3 months
Fever with ear pulling, or pain when lying flat
Diarrhoea, vomiting, or refusing most feeds
Rash spreading beyond the drool area
Fever lasting more than 5 days
"Teething" still worsening after 3–5 days

Go now

Emergency assessment

Any fever in a baby under 3 months
39°C or above at 3–6 months
Hard to wake, floppy, or unresponsive
Fast, laboured or noisy breathing; blue lips
Rash that does not fade under a glass
Stiff neck, bulging fontanelle, or a seizure
No urine for 8–12 hours, no tears, sunken fontanelle

Signs that are never "just teeth"

Fever ≥38°C under 3 months — immediate assessment, before any medicine
Fever ≥39°C at 3–6 months — same day
Lethargy or floppiness — sleepiness you cannot rouse is not a teething sign
Breathing changes — fast, grunting, chest indrawing, blue lips
Dehydration — fewer than 3–4 wet nappies, no tears, dry mouth, sunken fontanelle
Non-blanching rash — press a clear glass on it; if it stays, act urgently
Neurological signs — stiff neck, bulging fontanelle, seizure, abnormal tone
Persistent vomiting, blood in stool, or bile
Refusal of all fluids with fever — the risk here is dehydration, not the tooth
Your gut — "this is not my baby" is legitimate clinical information, even with a normal temperature

Three misreadings that delay treatment

Ear infection labelled as teething

Looks like: Fussiness, night waking, ear pulling, slightly warm.
What separates it: Fever plus a recent cold, pain when lying flat, and crying a few sucks into a feed. The drum can only be seen with an otoscope, so this is one to hand over rather than self-diagnose.
Cost of missing it: Days of preventable pain, and in recurrent cases, concerns about hearing and speech development.

Hand, foot and mouth disease labelled as teething

Looks like: Fever, heavy drooling, refusing food, miserable — a textbook "bad teething week".
What separates it: The degree of refusal and the location of the rash. A teething baby still drinks. HFMD blisters sit in the mouth and on palms, soles and buttocks. Look at the feet, not just the chin.
Cost of missing it: Dehydration from an untreated sore mouth, and continued mixing with other children while infectious.

Herpetic gingivostomatitis labelled as teething

Looks like: Red gums, copious drooling, high fever, foul breath, refusing everything.
What separates it: It is the whole mouth, not one spot. Multiple ulcers, bleeding gums, and a genuinely unwell child. Teething does not redden every gum at once.
Cost of missing it: Pain and dehydration that often need clinical management rather than home comfort measures.

Two quieter possibilities

Roseola: Three to five days of high fever, then the fever breaks and a faint trunk rash appears. The rash comes after the fever — the opposite of what parents expect.
Urinary tract infection: In infants it can present as nothing more than unexplained fever, poor feeding and vomiting, with no localising sign at all. This is one reason persistent fever without a source gets investigated.

The three-day log: what to write down, and why it works

The hardest question in a clinic is "how many days, how high, what did you give, and how many wet nappies?" A three-day record answers all four in seconds, prevents double-dosing, and turns a vague worry into a describable pattern.

Measure at fixed points: morning, mid-afternoon, bedtime, plus any moment the baby feels hot.
Same thermometer, same site. Note the site — rectal, axillary or ear. Ear thermometers are least reliable under 6 months.
Record every medicine: name, dose, time. Two products can share the same active ingredient.
Photograph any rash in daylight, with a coin beside it for scale.
Count nappies, do not describe them. Numbers are what a clinician can act on.

A worked three-day symptom log with one escalation row highlighted
Time	Temp (°C, site)	Milk / fluids	Nappies (wet / dirty)	Stool	Sleep	Mood and comfort	Medicine / what helped
07:00	37.2 ax	120 ml formula	1 / 0	Normal	Woke 3×	Fretful, settled on shoulder	None; chilled teether
14:00	37.6 ax	90 ml, pulled off twice	1 / 0	—	40 min nap	Smiled, played briefly	None; gum massage
21:00	38.4 ax	60 ml, refused second bottle	0 / 1	Loose, once	—	Cried continuously, hard to settle	Antipyretic, weight-based dose
02:00	38.9 ax	Refused	0 / 0	—	—	Slow to rouse, not interested	—
08:00	38.1 ax	70 ml	1 / 0	—	1 h nap	Better after fever, playing	Antipyretic continued
20:00	37.4 ax	140 ml	2 / 0	Normal	Woke 1×	Settled, cheerful	None

The highlighted row is the point at which observation should stop: temperature rising + refusing fluids + no wet nappy + slow to rouse, four at once. No further data is needed to justify a call.

Take the log with you, and lead with three sentences: which day it started, the highest temperature and where it was measured, and how many times the baby urinated today. Everything else the clinician can ask for.

Safe relief once illness is ruled out

The principle for teething discomfort is pressure, cool — and as little medicine as works.

Reasonable measures

Gentle gum massage with a clean finger, or a cool damp cloth to press and chew on
A chilled (refrigerator, never freezer) one-piece solid teether
Held upright, movement, distraction — these reduce pain behaviour more than parents expect
Paracetamol/acetaminophen at any age, or ibuprofen from 6 months, dosed by weight and on clinical advice
Barrier cream on the chin and neck to protect skin from constant drool

Skip entirely

Gels containing benzocaine — labels state "do not use for teething, in children under 2" because of methemoglobinemia risk
Prescription viscous lidocaine — boxed warning for infants and young children; generally not to be used for teething pain
Homeopathic teething tablets or gels — inconsistent belladonna content has been the subject of regulatory warnings
Amber, wood or silicone teething necklaces and bracelets — strangulation and choking risk, no evidence of benefit
Anything frozen solid — hard enough to injure tender gums
Teething biscuits that snap into chunks, and any food dipped in sugar or honey
Alcohol rubbed on the gums; aspirin in any form

For choosing the object itself, the screen is short: one-piece moulded, solid rather than liquid-filled, and too large to fit entirely in the mouth. Inspect before each use, and retire it at the first tear, crack or sticky surface. A simple structure has fewer ways to fail.

The rule in one line: fever at 38°C or above, or a baby who is not themselves, means assess for illness first and talk about teeth second.

Everything else is a judgement call — and judgement calls are allowed to be uncertain. What is not allowed is letting uncertainty turn into waiting. A call to a clinician costs an afternoon. A missed ear infection or a dehydrated baby costs considerably more.

For the part that is actually teething

Once illness is excluded, what a baby needs is something safe to bite and a way to keep the mouth clean. Our teethers are one-piece moulded, solid rather than liquid-filled, and sized so they cannot be swallowed whole.

One-piece natural latex teethers Solid, seamless, chillable; no liquid filling, no detachable parts. One-piece natural rubber pacifier For families still using a pacifier through the teething months. Care and cleaning notes Warm water, thorough rinse, air dry. No boiling, steam or microwave. Newborn toys, 0–3 months How mouthing starts, and what changes when the first tooth arrives. Manufacturing and testing Materials, structure and batch testing; request reports by model. More parent guides Certifications, nitrosamines, cleaning and replacement cycles.

Want this log as a printable sheet for a clinic or a nursery? Tell us the language and paper size, and we will lay it out.