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Immunity · Seasonal · Evidence graded

Cold Season: The First 24 Hours, and the Habits That Set You Up to Catch Everything

What’s worth doing at the first sign of a cold, what isn’t, and the autumn habits that quietly stack the odds against you, graded.

Stephen Duncan FDN-P MSc · Detective Health · October 2026 · 10 min read

Every autumn the same thing happens. We move indoors, the heating goes on, the clocks go back, the party invitations arrive, and half the office goes down with something. Some of that is just the season. Some of it we do to ourselves, every year. Here’s what’s worth doing at the first sign of a cold, what isn’t, and the habits that quietly stack the odds against you, graded.

The grades in this post: Strong means good randomised trials agree. Mixed means the trials are few, small, short or unblinded. Mechanistic means the biology or laboratory work makes sense but it hasn’t been shown to change outcomes in people. None means there’s no usable evidence in people. Observational studies are labelled as such: they show a link, not proof of cause.

Why it’s the same every year

Several things change at once in autumn, and most of them favour the virus:

None of these alone makes you ill. Stacked together, they change the odds.

The habits that stack the odds

HabitWhat the research foundGrade
Short sleepWhen 164 adults were given a cold virus, those who’d slept under 5 hours a night in the week before (measured with a wrist monitor) had about 4.5 times the odds of a cold, and 5 to 6 hours about 4 times, compared with over 7 hours. Six to seven hours carried no clear extra risk (Prather 2015). An earlier study found the same direction: under 7 hours vs 8 or more, about 3 times (Cohen 2009). Wide margins of error in both.Observational, consistent, within virus-challenge studies
StressIn 394 adults given a cold virus, the chance of a clinical cold rose steadily with psychological stress, from about 27% at the lowest stress to 47% at the highest (Cohen 1991).Observational, within a challenge study
SmokingSmokers were more likely both to be infected and to get ill once infected (Cohen 1993).Observational, within a challenge study
AlcoholHere’s the awkward one. In the same study, non-smokers who drank moderately (up to 3–4 drinks a day) had fewer colds, not more (Cohen 1993). That’s one study from 1993, and it doesn’t cover what a party season does to your sleep.One observational study. I’m reporting it because it’s what the evidence shows, not what I’d like it to show.
Mince pies and Christmas treatsMy own weakness. I found no good evidence that a mince pie dents your immune system. The harm is the pattern: late, sugary, boozy, short of sleep, every night for weeks.None for the treat on its own
Training through it allThe old idea that a hard session leaves an “open window” for infection is weaker than people think: lymphocytes drop after hard exercise because they move into the tissues, not because they’re suppressed (Campbell & Turner 2018). Regular exercise is linked to fewer infections.Review; the “open window” is disputed
Extra vitamin C “for the winter”In the general population, taking vitamin C every day didn’t reduce how many colds people caught (29 trial comparisons, 11,306 people). Colds were about 8% shorter in adults taking it regularly. Starting it when the cold starts showed no consistent benefit. The exception: people under heavy physical stress (marathon runners, skiers, soldiers on subarctic exercises) had about half the colds (Hemilä 2013, Cochrane).Strong No prevention for most people; possible benefit under extreme physical stress
Gargling with plain waterPlain water gargling, several times a day, cut new colds by about a third (36%) over 60 days in a Japanese trial of 387 healthy adults (Satomura 2005). An iodine gargle did no better than doing nothing.One randomised trial, unblinded, self-reported

The Christmas pattern I see every year: someone trains harder to “earn” the parties, diets in the day, takes extra vitamin C and vitamin D, then has the wine, the cake and the late nights on top. It’s the sum of all of it, not any one thing. The supplements don’t cancel the sleep.

“Everyone’s got it”: can you talk yourself into a cold?

Partly, yes. In a study where 334 volunteers were given a cold virus and watched in quarantine:

Observational, within a controlled virus-challenge study. So the office chatter about who’s sick doesn’t make you catch the virus. But it can make you feel ill without it, and an anxious winter doesn’t help.

The first 24 hours: what’s worth doing

How long does it last?

Longer than most of us expect. In adults, an acute cough lasts about 18 days on average, but people surveyed expected 7 to 9 (Ebell 2013). In children, 90% of colds have cleared by day 15 and 90% of coughs by day 25 (Thompson 2013). The NHS says a cough usually clears up on its own within 3 to 4 weeks, and to see a GP if you’ve had a cough for more than 3 weeks. So day 7 isn’t a sign something’s wrong; it’s often halfway. Get help sooner for the red flags below.

Painkillers: in a small 1990 trial, 56 volunteers given a cold virus who took aspirin or paracetamol had a weaker antibody response and more nasal symptoms than those on a placebo (Graham 1990). One small study: take something if you need it to sleep or function, but there’s no need to treat a cold on principle. Grade: one small randomised trial.

At the first scratch in your throat, ranked by the evidence:

  1. Saline nasal spray, used early and often. In a UK trial of 13,799 adults with a health condition or frequent colds, a plain saline spray at the first sign (or after being exposed) cut days of illness by about a fifth over six months, as much as Vicks First Defence, and without First Defence’s extra headaches (Little 2024). Twelve months on, the result held: illness days down about 17% with either spray, and headaches 7.8% on First Defence against 3.4% on saline and 4.7% with usual care (Little 2026). Mixed One large trial, but open-label, with self-reported illness days. Any plain saline spray will do: the trial’s was an ordinary isotonic (body-strength) one. Hypertonic sprays, often sea water, are saltier. They draw fluid out of the lining and may unblock a stuffy nose for a few hours, but they can sting, and I found no trial comparing them with plain saline for days ill. Some add copper and manganese. The only trial I found was by the manufacturer’s own researchers, open-label, in children aged 3 months to 4 years, against usual care alone (Chen 2026). Mechanistic for the hypertonic extra; no adult trial for the added minerals.
  2. Zinc, mostly as lozenges in the trials: may shorten a cold by about two days, with more side effects such as a bad taste or nausea (Nault 2024, Cochrane). Mixed Low certainty. Full details in Zinc: Supplement of the Month.
  3. ColdZyme (a mouth spray that coats the throat). Two trials in endurance athletes found colds shorter: by 2.7 days on average against no treatment (10.4 vs 7.7 days; Davison 2020), and by 4.5 days on average against a dummy spray, though only 1.5 days on the middle value (Davison 2025). Neither found fewer colds. The largest trial, 701 adults, missed its main measures, and in June 2026 the journal published an Expression of Concern about it (Lindberg 2023). Mixed May shorten a cold; doesn’t prevent one.
  4. Carrageenan nasal sprays (a seaweed gel). A re-analysis of two placebo-controlled trials, in children and adults, found people recovered about half as fast again; the effect was on the longer colds, with no meaningful effect on short ones (Hemilä 2021). Mixed Small trials, re-analysed.
  5. Salt-water nose rinse and gargle. A small Edinburgh pilot found colds 1.9 days shorter in people who started within 48 hours (Ramalingam 2019). Mixed One small, unblinded pilot. The NHS also suggests gargling salt water for a sore throat (not for children).
  6. Honey for the cough. Across 14 studies, honey beat usual care for cough frequency and severity (Abuelgasim 2020); in young children, a spoon of honey at bedtime eased night-time cough more than a placebo (Cohen 2012). Not for babies under 12 months (NHS). See Coughs and Sneezes.
  7. Sleep. If the sleep studies are right, an early night is worth more than anything in the cupboard.

Not worth it: First Defence over plain saline (same benefit, more headaches); hypochlorous acid (HOCl) sprays (laboratory evidence only: Yu 2011); starting vitamin C once the cold has begun; elderberry (the best trial found nothing); carbomer gel spray (no difference from placebo on any efficacy measure: Dennie 2019, by a GSK author). The NHS agrees on the supplements: “There’s little evidence that supplements such as vitamin C, echinacea or garlic prevent colds or help you get better more quickly.”

What people swear by

Remedies clients ask me about every winter, graded the same way.

  • Echinacea. Some extracts may slightly reduce how many colds you catch if taken daily through winter: one trial of 755 people over four months reported fewer colds, though the difference in the number of colds wasn’t statistically significant (Jawad 2012, part-funded by the maker). For treating a cold that’s started, no shown benefit (Karsch-Völk 2014, Cochrane). Mixed for prevention; None for treatment.
  • Iodine sprays and gargles (povidone-iodine). The nasal spray missed its main measure against saline (Polasek 2025); the gargle did no better than nothing, while plain water did (Satomura 2005). Not for regular use without advice if you have a thyroid condition. None so far.
  • N-acetylcysteine (NAC). In one Italian trial, mostly older adults taking it daily for six months caught flu as often, but far fewer got ill with it: 25% of those infected against 79% (De Flora 1997). One old trial; it’s a winter-long habit, not a first-sniffle remedy. Grade: one trial; promising, unconfirmed.
  • Oregano oil. Strong in the lab; I found no trial in people with colds. None.
  • Lauric acid and monolaurin. The well-known result is glycerol monolaurate applied vaginally in monkeys (Li 2009), not a capsule for a cold. I found no human trial for colds. None.
  • Cod liver oil. In young children, cod liver oil with a multivitamin cut doctor visits for colds (Linday 2010, a review of her own trials), but it was combined, so we can’t say which part worked. Vitamin A didn’t prevent colds in children up to seven (Cheng 2024, Cochrane; low certainty). Mixed, and not separable.
  • Granny’s chicken soup. Sipped hot soup and sipped hot water sped up nasal mucus about equally, and the effect was gone within half an hour (Saketkhoo 1978); in a lab dish, soup calmed inflammatory white cells (Rennard 2000). Bone broth or stock: nobody has compared them. Mechanistic Cheap, warm, a fluid, and it does no harm.

Everyone’s got their own: the home remedies

We’ve all had colds, fit or unfit, and we all end up with our own go-to that’s ‘guaranteed to work’. Some of it is belief and some of it is ritual, and neither is a bad thing if it helps you rest. Here’s what’s behind three of mine and yours.

The hot toddy. Whisky, honey, lemon and hot water: the classic Scottish nightcap, and I’ll admit a cold is a good excuse for a single malt. The hot drink part has some support: in 30 people with colds, a hot fruit drink made them feel less blocked and eased several symptoms, even though measured airflow didn’t change; the same drink at room temperature eased fewer (Sanu 2008). The honey helps a cough (see above). The whisky is the weak link: even about two drinks cuts REM sleep, and more makes it worse (Gardiner 2024). Mixed Hot drink: one small trial, felt relief. None Alcohol for a cold, and it costs you some sleep quality. If it’s your ritual, keep it to one.

Better out than in? I’m a clear-your-throat, blow-your-nose man. The evidence adds one caution: a hard nose blow creates far more pressure than a sneeze or a cough, and in a scan study a single blow pushed fluid from the nose into the sinuses in all four people (Gwaltney 2000). So blow, but gently, one side at a time. Mechanistic A tiny study; the ‘gently, one side’ advice is common sense, not trial-tested.

Man flu. Not to be laughed at. A doctor writing in the BMJ’s Christmas issue, tired of being accused of over-reacting, searched the evidence on whether men really do suffer worse symptoms, and whether there could be an evolutionary reason (Sue 2017). He concluded that some evidence supports men having worse illness and higher death rates from viral respiratory infections, possibly because of a weaker immune response, but that it was limited: some of it was low-level, and the studies didn’t allow for men smoking more or being less likely to seek care. His tongue-in-cheek verdict: men may not be exaggerating, and the term is “potentially unjust”. The Christmas issue is peer-reviewed but written partly for fun; grade: a light-hearted review of real but mostly observational and animal data. A more direct test came later: in 113 adults with acute sinusitis taking a placebo, doctors rated men and women as equally unwell at the start. Women reported more symptoms at first but recovered faster, and the authors concluded the idea of men over-reporting should be dropped (Riedl 2022). Mixed Men may recover a little more slowly; no evidence they exaggerate. Women may disagree.

Train or rest?

The common rule is the “neck check”: symptoms only above the neck (runny nose, sneezing, mild sore throat) and you can usually do light to moderate exercise. Below the neck (chest, aching muscles, a temperature, an upset stomach), rest. Practice guidance, not trial-tested: I couldn’t find it stated by the NHS, NHS inform or a sports medicine body. The NHS’s own line is simpler: if you have a high temperature or don’t feel well enough to do your normal activities, stay at home and avoid other people until you feel better.

What evidence there is: young adults given a cold virus who exercised moderately every other day for 10 days had no worse symptoms than those who didn’t exercise (Weidner 1998, 50 people). Mixed One small study, mild colds.

Don’t train hard with a temperature. Don’t use a session to “sweat it out”. Do go back gradually. And if you’re coughing on the gym equipment, stay home for everyone else’s sake.

What I’d do this year

When to get help: NHS advice

A cold: see a GP if you have a high temperature for more than 3 days; your symptoms get worse; your temperature is very high, or you feel hot, cold or shivery; you feel short of breath or have chest pain; your symptoms don’t get better after 10 days; you have a cough for more than 3 weeks; or you have a long-term condition (such as diabetes, or a heart, lung or kidney condition) or a weakened immune system.

Flu: ask for an urgent GP appointment or get help from NHS 111 if you’re 65 or over, pregnant or have recently given birth, have a long-term condition or a weakened immune system, feel very unwell or short of breath, or your symptoms don’t improve after 7 days.

Call 999 or go to A&E if you get sudden chest pain, have severe difficulty breathing (gasping, choking or not able to get words out), or start coughing up blood. In Scotland, NHS inform gives the same advice, and says to phone 111 if your GP practice is closed.

How strong is the evidence?

ClaimGradeMain source
Short sleep and stress raise the odds of a coldObservational, consistentPrather 2015; Cohen 2009; Cohen 1991
Vitamin D supplements prevent respiratory infectionsStrong not significant overallJolliffe 2025
Daily vitamin C prevents colds in most peopleStrong doesn’tHemilä 2013
Saline spray at the first sign shortens illnessMixed one large open-label trialLittle 2024; Little 2026
Zinc shortens a coldMixed low certaintyNault 2024
Salt-water rinse and gargle shortens a coldMixed one small pilotRamalingam 2019
ColdZyme shortens a coldMixed two small athlete trials; largest trial missed, under an Expression of ConcernDavison 2020; Davison 2025; Lindberg 2023
Carrageenan nasal spray speeds recoveryMixed two small trials, re-analysedHemilä 2021
Water gargling prevents coldsOne unblinded trialSatomura 2005
A hot drink eases cold symptomsMixed one small trial, felt relief onlySanu 2008
Whisky (alcohol) helps a coldNone and it cuts REM sleepGardiner 2024
“Man flu”: men exaggerate cold symptomsMixed not supported; men may recover a little more slowlyRiedl 2022; Sue 2017
Blow gently, one side at a timeMechanistic tiny scan study; advice not trial-testedGwaltney 2000
NAC prevents illness from fluOne trial, 1997De Flora 1997
Oregano oil treats coldsNone laboratory only—
Lauric acid / monolaurin treats coldsNone no human trialLi 2009 (monkeys)
Cod liver oil prevents coldsMixed combined with a multivitaminLinday 2010; Cheng 2024
Chicken soup clears a coldMechanistic short-lived, labSaketkhoo 1978; Rennard 2000
Honey eases coughMixed moderate risk of biasAbuelgasim 2020; Cohen 2012
Moderate exercise with a mild cold is fineMixed one small studyWeidner 1998
Dry indoor air helps flu spreadMechanistic laboratory, fluShaman 2009
HOCl sprays treat coldsMechanistic laboratory onlyYu 2011

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