Flu, the common cold, and COVID-19 can feel alike, so symptoms alone cannot reliably tell you which virus you have. A test can help identify the cause. If you are at higher risk of severe illness, contact a healthcare provider promptly: treatment for flu and COVID-19 can be time-sensitive.
How flu, a cold, and COVID-19 symptoms compare
Each illness is caused by a different virus, but their symptoms overlap. A cold-like illness is not proof that you have a cold, and no single symptom reliably identifies flu or COVID-19.
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| Illness | Symptoms that may occur | What symptoms can tell you |
|---|---|---|
| Common cold | Runny nose, cough, and sore throat are common. | Cold symptoms usually improve with time, but many viruses can cause similar symptoms. A cold cannot be confirmed by how symptoms feel alone. CDC common-cold guidance |
| Flu | Fever or chills, cough, fatigue, sore throat, congestion, body aches, headache, and sometimes vomiting or diarrhea. Not everyone with flu has a fever. | Flu shares many symptoms with COVID-19, so symptoms alone cannot distinguish the two. CDC comparison of flu and COVID-19 |
| COVID-19 | Fever or chills, cough, shortness of breath, fatigue, sore throat, congestion, aches, headache, vomiting, diarrhea, or changes in taste or smell. | Taste or smell changes are more frequent with COVID-19, but they are not a dependable standalone test. COVID-19 also overlaps with flu and other respiratory viruses. CDC comparison of flu and COVID-19 |
Sudden symptoms do not prove flu, no fever does not prove a cold, and a change in taste or smell does not prove COVID-19. Testing is the way to check which virus is responsible.
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Should you test for flu or COVID-19?
Testing can identify the virus and help inform treatment. Some molecular tests, including NAAT/PCR tests, can detect flu and COVID-19 at the same time; combination tests can also identify a coinfection. Having a positive result for one virus does not establish that another is absent. Coinfection can happen, although the CDC describes it as uncommon. CDC comparison of flu and COVID-19
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At-home tests and negative results
For the 2025–2026 flu season, the CDC reports that home-use tests are available for influenza A and B and SARS-CoV-2. An antigen test can be negative even when you are infected, particularly when viruses are circulating widely. A negative result therefore does not always rule out infection. CDC influenza testing guidance CDC COVID-19 testing guidance
For symptomatic patients in whom flu or COVID-19 is suspected and timely treatment may be indicated, the CDC recommends molecular testing such as NAATs. A clinician can advise which test is appropriate and how to interpret a result.
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When to contact a clinician about treatment
If you are at higher risk of severe illness from flu or COVID-19, contact a healthcare provider right away if you develop respiratory symptoms, even if they seem mild. Do not wait to self-diagnose or arrange a test before asking about care; you may qualify for early antiviral treatment. CDC guidance for people who are sick
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Flu antivirals are prescription medicines and work best when started within 1–2 days after symptoms begin. They are recommended promptly for people with suspected or confirmed flu who are at increased risk of serious complications. COVID-19 treatment should start within 5–7 days after symptoms begin, according to the CDC’s cold-management guidance. A clinician must assess whether a prescription treatment is appropriate. CDC flu treatment guidance CDC common-cold guidance
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- Note: Before using the health care thermometer, carefully read the product manual. Start measuring when “Lo℉” shows up. To ensure the accuracy of the measurement, avoid touching the probe with your hands or other hot objects prior to taking the temperature.
What you can do for a cold and when to seek care
The common cold has no cure and usually improves on its own. Over-the-counter pain relievers and fever reducers may relieve symptoms, but they do not cure the infection. Check the product label for age limits and directions, and ask a clinician or pharmacist about interactions or whether a medicine is appropriate for you. Antibiotics do not treat viral colds; they are appropriate only if a clinician identifies a bacterial infection. CDC common-cold guidance
Seek medical care for trouble or fast breathing, dehydration, fever lasting more than four days, symptoms lasting more than ten days without improvement, symptoms that improve and then return or worsen, or worsening chronic conditions. This list is not exhaustive; contact a healthcare provider for severe or concerning symptoms. CDC common-cold guidance
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When symptoms need emergency help
Call 911 or go to a local emergency facility for COVID-19 warning signs such as trouble breathing, persistent chest pain or pressure, new confusion, inability to wake or stay awake, or pale, gray, or blue coloration of the lips, nail beds, or skin. CDC COVID-19 signs and symptoms
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Flu warning signs include difficulty breathing, persistent chest or abdominal pain, confusion, seizures, not urinating, severe muscle pain or weakness, and symptoms that improve and then return or worsen. Any severe or concerning symptom warrants medical attention. CDC flu signs and symptoms
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This guidance is U.S.-oriented and does not replace individual medical advice. Seasonal testing availability and treatment guidance may change.
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