Influenza (Adult)

Updated for the 2025-2026 flu season

Influenza is also called the flu. It's a viral illness that affects the air passages of your nose, sinuses, throat, and lungs. It's more serious than the common cold. The flu can easily be passed from one person to another. It is very contagious. It may be spread through the air by coughing and sneezing. It can also be spread by touching the sick person and then touching your own eyes, nose, or mouth.

The flu starts 1 to 4 days after you are exposed to the flu virus. Symptoms usually last for about 3 days, but it can take 1 to 2 weeks to fully recover. You usually don't need to take antibiotics unless you are at high risk for or have a complication from a bacterial infection. This might be an ear or sinus infection or pneumonia.

Flu symptoms may be mild or severe. They can include extreme tiredness (wanting to stay in bed all day), chills, fevers, muscle aches, soreness with eye movement, headache, and a dry, hacking cough.

Antiviral medicine for the flu is available by prescription. If you start taking it within 48 hours, it may help reduce how long your symptoms last and how severe they are. Your doctor may do a test to find out if you have influenza and which strain you have.

Follow these guidelines when caring for yourself at home:

• Stay away from cigarette smoke, whether it's yours or other people's. Also avoid smoke from vaping or other tobacco or nicotine products.
• Acetaminophen or ibuprofen will help ease your fever, muscle aches, and headache. Don't give aspirin to anyone younger than 18 who has the flu. This can cause a serious condition called Reye syndrome.
• Nausea, loose stools, and loss of appetite are common with the flu. Eat light meals. Drink 6 to 8 glasses of liquids every day. Good choices are water, sport drinks, soft drinks without caffeine, juices, tea, and soup. Extra fluids will also help loosen secretions in your nose and lungs.
• Over-the-counter cold medicines will not make the flu go away faster. But the medicines may help with coughing, sore throat, and congestion in your nose and sinuses. Don't use a decongestant if you have high blood pressure.
• Stay home until your fever has been gone for at least 24 hours without using medicine to reduce fever.
• Drink enough fluids so that you do not become dehydrated.
• Take warm, steamy showers to help soothe your cough.
• If you have a sore throat, gargling with warm salty water, sucking on an ice cube, drinking hot water with honey and freshly squeezed lemon juice can help.

Follow up with your doctor, or as advised, if you're not getting better over the next week.

Talk with your doctor to make sure you're up to date with all vaccines. With very few exceptions, all adults should get a flu vaccine every fall. September and October are generally good times to get vaccinated. Ask your doctor about this.

Contact your doctor right away if you have the flu and any of these occur:

• Cough with lots of colored mucus (sputum) or blood in your mucus
• Chest pain, shortness of breath, wheezing, or trouble breathing
• Severe headache, or face, neck, or ear pain
• New rash with fever
• Fever of 100.4°F (38°C) or higher, or as advised by your doctor
• Confusion, behavior change, or seizure
• Severe weakness or dizziness
• You get a new fever or cough after getting better for a few days

Also contact your doctor if you have flu symptoms and have a weakened immune system or are taking medicines that can weaken your immune system. These include steroids and certain anti-inflammatory medicines.