See what your health looks like between colds
150+ lab tests across two draws, explained in plain language
- CLIA-certified labs
- HIPAA compliant
- Personalized health protocol
The symptoms of a common cold
A common cold is a viral infection of the upper respiratory tract, also called a head cold or an upper respiratory infection. Cold symptoms most often include a runny or stuffy nose, sore throat, sneezing, cough, and mild body aches.
Grouped by body region, the symptoms of a cold fall into four clusters.
- Nose: a runny nose, nasal congestion, and sneezing.
- Throat and chest: a sore throat and cough.
- Head and body: headache and mild body aches.
- Temperature: fever, usually low grade when it appears at all.
How a cold progresses, day by day
Cold symptoms build rather than arrive together. Signs and symptoms usually peak within 2 to 3 days of infection.
| Stage | What is happening | Symptoms that dominate |
|---|---|---|
| Days 1 to 3 | The illness sets in and builds toward its peak | Sore throat, the most bothersome symptom on day 1 |
| Days 4 to 7 | Nasal symptoms hand over to chest symptoms | Congestion through day 5, then cough on days 6 and 7 |
| Days 8 to 10 and beyond | Recovery, though some symptoms last 10 to 14 days | A cough lingering after the rest has cleared |
The stages describe which symptom dominates, not a tidy sequence of arrivals. Congestion, pain symptoms, secretory symptoms, and cough overlap heavily across the first 4 days.
How long cold symptoms last
Most colds are shorter than they feel. Colds usually last less than a week, though some cold symptoms can last 10 to 14 days.
A cough is the exception worth knowing about. The mean duration of cough in the published literature runs to 17.8 days, against a public expectation of 5 to 7 days. A cough that outlasts the rest of a cold is the norm rather than a complication.
Cold, flu, COVID-19, or allergies: how to tell the difference
Plenty of illnesses borrow the cold's symptoms without being a cold. SARS-CoV-2 (COVID-19), influenza, and RSV cause cold-like symptoms without causing colds. The pattern across several symptoms separates them better than any single symptom does.
| Feature | Cold | Flu | COVID-19 | Allergies |
|---|---|---|---|---|
| Onset speed | Gradual, building toward a 2-to-3-day peak | Symptoms usually come on suddenly | Symptoms typically appear 2 to 5 days after infection | Starts with pollen exposure, not infection |
| Fever | Usually low grade when it occurs | Fever or chills, though not everyone with flu has one | Fever or chills | None |
| Body aches | Mild body aches | Muscle or body aches | Muscle pain and headache | None |
| Cough | Common, and the last symptom to go | Common | Common | Cough with postnasal drip |
| Sneezing and itchy eyes | Sneezing | Runny or stuffy nose | Runny or stuffy nose | Sneezing with itching eyes, nose, and throat |
| Duration or contagious window | Under a week, with some symptoms to 10 to 14 days | Most contagious during the first 3 days | Contagious on average about 8 days after symptoms start | Lasts as long as pollen exposure continues |
Three details do most of the sorting. Itchy, watery eyes with no fever point toward allergies, a sudden onset points toward flu, and a change in taste or smell points toward COVID-19.
What causes a cold, and how it spreads
A cold is a viral illness, and the virus pool behind it is enormous. More than 200 respiratory viruses can cause colds, and rhinoviruses are the most frequent cause in the United States. Among young adults studied with colds, rhinoviruses accounted for roughly half of episodes, while bacterial infection turned up in only 7 of 200 patients.
A cold spreads through droplets from coughing or sneezing, through contaminated surfaces carried to the eyes, nose, or mouth, and through close personal contact.
How cold symptoms differ in children
Children catch more colds than adults, and show them differently. Most children have around 8 to 10 colds in their first 2 years alone, more with childcare or school-age siblings. A child's cold brings a runny nose that starts clear and later thickens, sneezing, reduced appetite, sore throat, cough, on-and-off fussiness, and slightly swollen neck glands. A child's fever often reaches 101 to 102 degrees Fahrenheit (38.3 to 38.9 Celsius), particularly at night. An adult's cold fever, when it appears, usually stays low grade.
Symptoms fade slowly after 7 to 10 days. In children studied across respiratory infections, the common cold had resolved in 90% of children by 15 days. Acute cough took until day 25 to clear in the same share.
How to relieve cold symptoms at home
There is no cure for the common cold, and most people with cold symptoms will not require specific treatment. Over-the-counter medicines relieve symptoms without curing the illness. That leaves comfort measures, and a few have real evidence behind them.
- Plenty of rest and plenty of fluids.
- A clean humidifier or cool mist vaporizer, or steam from a hot shower.
- Gargling with warm salt water for a raw throat.
- Saline nasal spray or drops, worth trying though the trials were small and at high risk of bias, with a rubber suction bulb for young children.
- Throat lozenges or cough drops, not for children under 4 years.
- Honey for cough in anyone at least 1 year old, which probably reduces cough frequency in children, mainly in the first 3 days.
- Over-the-counter cough and cold medicines, not recommended under 6 years because side effects can be serious.
Antibiotics are the one thing to rule out. Antibiotics do not work against viruses. Participants given them for a common cold did no better than those on placebo, and the risk of adverse effects was higher.
Get 150+ lab tests from home
Two blood draws a year. A full picture of your health, explained in plain language.
Get 150+ lab tests from home
Two blood draws a year. A full picture of your health, explained in plain language.
When to see a doctor about cold symptoms
Most colds clear without help. A cold should improve on its own, so a symptom that worsens instead of easing is worth acting on.
- Trouble breathing or fast breathing.
- Dehydration.
- Fever lasting longer than 4 days.
- Symptoms lasting more than 10 days without getting better.
- Symptoms such as fever or cough that improve and then return or worsen.
- Chronic medical conditions that get worse.
For a child 3 months or younger, call the pediatrician at the first sign of illness.
Why you keep catching colds
Catching several colds a year is the ordinary rate, not a warning sign. Adults average two to three colds per year, and children usually have more.
Sleep is the one habit with experimental evidence behind it, measured objectively by wrist actigraphy for a week before a rhinovirus challenge. Adults sleeping under 5 hours a night were likelier to develop a cold than those sleeping more than 7 hours. Five to 6 hours carried the same disadvantage, while 6 to 7 hours did not. The pattern held independently of existing antibody levels, demographics, season, and BMI. Sleep is one measurable input into how often you get sick, and it is not the only one.
Understand what your cold symptoms are telling you with Superpower
A cold is short-lived, and cold symptoms rarely need more than time. How often you get run down, and how quickly you recover, is easier to read against your own baseline. A Superpower membership includes two blood draws, an initial baseline and a partial re-draw of your most critical markers, for 150+ lab tests. Your results sit in one place, tracked across draws, with a personalized action plan.
A winter of colds deserves a closer look than a tally kept in your memory. Start your Superpower membership and turn a single set of results into ongoing, on-demand support.
Frequently Asked Questions
References
- Centers for Disease Control and Prevention. (2026). *About common cold*. U.S. Department of Health and Human Services.
- Witek TJ, Ramsey DL, Carr AN, Riker DK (2015). The natural history of community-acquired common colds symptoms assessed over 4-years. *Rhinology*, *53*(1), 81–88. https://doi.org/10.4193/Rhino14.149
- MedlinePlus. (2022). *Common cold*. National Library of Medicine.
- Ebell MH, Lundgren J, Youngpairoj S (2013). How long does a cough last? Comparing patients' expectations with data from a systematic review of the literature. *Annals of Family Medicine*, *11*(1), 5–13. https://doi.org/10.1370/afm.1430
- Centers for Disease Control and Prevention. (2024). *Signs and symptoms of flu*. U.S. Department of Health and Human Services.
- Centers for Disease Control and Prevention. (2024). *Similarities and differences between flu and COVID-19*. U.S. Department of Health and Human Services.
- MedlinePlus. (2018). *Hay fever*. National Library of Medicine.
- Mäkelä MJ, Puhakka T, Ruuskanen O, et al. (1998). Viruses and bacteria in the etiology of the common cold. *Journal of Clinical Microbiology*, *36*(2), 539–542. https://doi.org/10.1128/JCM.36.2.539-542.1998
- American Academy of Pediatrics. (2025). *Children and colds (upper respiratory infections)*. HealthyChildren.org.
- Thompson M, Vodicka TA, Blair PS, Buckley DI, Heneghan C, Hay AD (2013). Duration of symptoms of respiratory tract infections in children: systematic review. *BMJ*, *347*, f7027. https://doi.org/10.1136/bmj.f7027
- Centers for Disease Control and Prevention. (2026). *Manage common cold*. U.S. Department of Health and Human Services.
- King D, Mitchell B, Williams CP, Spurling GK (2015). Saline nasal irrigation for acute upper respiratory tract infections. *Cochrane Database of Systematic Reviews*, *2015*(4), CD006821. https://doi.org/10.1002/14651858.CD006821.pub3
- Oduwole O, Udoh EE, Oyo-Ita A, Meremikwu MM (2018). Honey for acute cough in children. *Cochrane Database of Systematic Reviews*, *4*(4), CD007094. https://doi.org/10.1002/14651858.CD007094.pub5
- Kenealy T, Arroll B (2025). Antibiotics for the common cold and acute purulent rhinitis. *Cochrane Database of Systematic Reviews*, *11*(11), CD000247. https://doi.org/10.1002/14651858.CD000247.pub4
- Prather AA, Janicki-Deverts D, Hall MH, Cohen S (2015). Behaviorally assessed sleep and susceptibility to the common cold. *Sleep*, *38*(9), 1353–1359. https://doi.org/10.5665/sleep.4968



















