# Flu or cold? How to tell the difference this season Flu arrived early this year. Here’s how to tell what you have, what actually helps, and when to stop waiting it out. Source: https://nourishandstrong.com/flu-vs-cold Published: 2026-11-06 Updated: 2026-11-06 By: the Nourish & Strong team General information, not medical advice. **The short answer:** flu usually hits suddenly, within hours, and leaves you too exhausted to carry on, often with fever, body aches and headache. A cold comes on gradually and stays mostly in your nose and throat, so you can usually keep going. Most people recover at home, but trouble breathing, chest pain or confusion needs medical care right away. If you’ve woken up feeling awful and you’re wondering what’s going around, you’re not alone. Here’s how to work out what you’re dealing with. ## What’s the difference between flu and a cold? This comparison comes from the CDC: | Symptom | Cold | Flu | | --- | --- | --- | | How it starts | Gradually | Suddenly | | Fever | Rare | Common, lasts 3 to 4 days | | Aches | Slight | Common, often severe | | Chills | Uncommon | Fairly common | | Tiredness, weakness | Sometimes | Usual | | Sneezing | Common | Sometimes | | Chest discomfort, cough | Mild to moderate | Common, can be severe | | Stuffy nose | Common | Sometimes | | Sore throat | Common | Sometimes | | Headache | Rare | Common | Source: CDC, Signs and Symptoms of Flu. The NHS has a simple test. With a cold, you feel unwell but you can usually carry on with your day. With flu, you feel too exhausted to. One catch: the CDC says not everyone with flu has a fever. And symptoms overlap with other illnesses, including COVID-19, so symptoms alone can’t tell you for certain. A doctor can test you if the answer would change your care. ## What are this year’s flu symptoms? The symptoms are the usual flu symptoms. The CDC’s latest report doesn’t describe anything new. They include fever or chills, cough, sore throat, a runny or stuffy nose, body aches, headache and tiredness. Some people get vomiting and diarrhea, more often children than adults. What’s different this year is the timing. In its report for the week ending October 24, 2026, the CDC said flu activity was still low nationally, but higher than usual for this time of year. Most of the viruses it subtyped were influenza A(H1N1). The CDC also said it’s too early to know how this affects vaccine effectiveness, and that an early rise doesn’t necessarily mean a higher peak or a more severe season. Flu data changes every week, so check the CDC for the latest. ## How long does flu last? The CDC says most people recover in a few days to less than two weeks. A cold usually starts to feel better in about one to two weeks, according to the NHS. The CDC says people with flu are most contagious in the first three days of illness, and the virus can be found from one day before symptoms start to five to seven days after. So you can pass it on before you know you have it. ## What helps with flu at home? - **Rest and sleep.** The NHS puts this first. - **Drink plenty of water.** The NHS says your pee should be light yellow or clear. - **Take acetaminophen (paracetamol) or ibuprofen** for fever and aches, if they’re safe for you. Follow the label. Don’t combine acetaminophen with cold and flu remedies that also contain it, because it’s easy to take too much. - **Never give aspirin to anyone under 16,** as the NHS warns. - **Skip the antibiotics.** The CDC says they don’t work on viruses, and their side effects can still harm you. - **Stay home.** The CDC says you can go back to normal activities when, for at least 24 hours, you’re feeling better overall and have had no fever without fever-reducing medicine. The NHS also says there’s little evidence that vitamin C, echinacea or garlic prevent colds or help you recover faster. It’s easier if you have the basics at home before you get sick. Our [home emergency kit list](https://nourishandstrong.com/home-emergency-kit-list) covers what to keep in the house. ## When should you ask about antiviral medicine? Early. The CDC says prescription antivirals work best when started within two days of your first symptoms. They can make the illness milder and shorten it by about a day, and they may help prevent some complications. Most people don’t need them. But the CDC says to contact a healthcare provider right away if you have flu symptoms and you’re at higher risk, very sick, or worried. Higher-risk groups include: - People 65 and older - People with conditions such as asthma, diabetes or heart disease - Pregnant women - Children under 5, especially under 2 ## What are the warning signs of something serious? **Get medical care right away for any of these signs in an adult, which the CDC lists as emergency warning signs:** - Difficulty breathing or shortness of breath - Ongoing pain or pressure in the chest or abdomen - Ongoing dizziness, confusion, or being hard to wake - Seizures - Not urinating - Severe muscle pain, weakness or unsteadiness - Fever or cough that improves, then returns or gets worse - A long-term condition getting worse **In children, the CDC also lists:** fast or troubled breathing, bluish lips or face, ribs pulling in with each breath, chest pain, severe muscle pain (a child refusing to walk), signs of dehydration such as no urine for 8 hours, not being alert when awake, seizures, a fever above 104°F not controlled by medicine, and any fever in a baby under 12 weeks. These lists aren’t complete. Call for help about any symptom that is severe or worrying. ## Is it too late for a flu shot? The CDC recommends a flu vaccine every season for almost everyone 6 months and older. It says vaccination reduces the risk of illness, hospitalization and death from flu, and that people who still catch flu tend to be less sick. People 65 and older have three preferred vaccines, so ask which one your pharmacy has. Protection takes time. The CDC says antibodies develop about two weeks after the shot. ## Why do I feel sick after a flu shot? The CDC says flu vaccines can’t cause flu. Common side effects are soreness, redness or swelling where you had the shot, headache, fever, nausea and muscle aches. They’re generally mild and go away within a few days. If you feel properly ill, you may have caught something else, or caught flu before your protection built up. Treat it like any other illness. Trouble breathing, swelling around the eyes or lips, hives, or a fast heartbeat soon after a shot could be a severe allergic reaction, so call 911. ## What if you still feel wiped out afterward? Go easy on yourself as you get back to normal. If tiredness drags on, see our guide to [why you might always feel tired](https://nourishandstrong.com/why-am-i-always-tired), which covers the causes worth checking with your doctor. And when you’re well again, our [printable guides](https://nourishandstrong.com/complete-guide-set) cover food, back pain and home safety. ## Quick questions ### How can I tell if I have a cold or the flu? Flu usually starts suddenly and leaves you too exhausted to carry on, often with fever, aches and headache. A cold comes on gradually and mainly affects your nose and throat. A doctor can test you if you need to know for certain. ### What are the first signs of flu? The CDC says flu symptoms usually come on suddenly. They can include fever or chills, cough, sore throat, a runny or stuffy nose, body aches, headache and tiredness. Not everyone with flu has a fever. ### What sickness is going around right now? In its report for the week ending October 24, 2026, the CDC said flu activity was low nationally but higher than usual for the time of year and rising in many areas. Colds and other infections also circulate at this time of year, so check the CDC or your local health department for current data. ### Can you get flu from a flu shot? No. The CDC says flu vaccines cannot cause flu. Side effects such as soreness, headache, fever and muscle aches can happen, and they generally go away within a few days. ### How long are you contagious with the flu? The CDC says people are most contagious in the first three days of illness. The virus can be found from one day before symptoms start to five to seven days after, and possibly longer in young children and people with weakened immune systems. ### Do antibiotics help with flu? No. The CDC says antibiotics don’t work on viruses. Prescription antivirals are different, and they work best when started within two days of your first symptoms. This article is general information, not medical advice. If you’re unsure, call your doctor or a nurse line, and call 911 in an emergency. ## Sources - CDC. [Signs and Symptoms of Flu](https://www.cdc.gov/flu/signs-symptoms/index.html). - CDC. [Weekly US Influenza Surveillance Report, week 42, 2026](https://www.cdc.gov/fluview/surveillance/2026-week-42.html). - CDC. [Treatment of Flu](https://www.cdc.gov/flu/treatment/index.html). - CDC. [How Flu Spreads](https://www.cdc.gov/flu/spread/index.html). - CDC. [Flu Vaccine Safety](https://www.cdc.gov/flu/vaccine-safety/index.html) and [Key Facts About Seasonal Flu Vaccine](https://www.cdc.gov/flu/vaccines/keyfacts.html). - NHS. [Flu](https://www.nhs.uk/conditions/flu/) and [Common cold](https://www.nhs.uk/conditions/common-cold/).