Flu timeline: Stages, recovery, and more

Key takeaways

• The flu progresses through 5 stages: incubation, symptom onset, symptom peak, recovery begins, and full recovery.
• You’re most contagious in the first 3 days of illness, but the virus can spread from 1 day before symptoms start until 5 to 7 days after. Antiviral medications like oseltamivir (Tamiflu) may shorten illness by about 1 day if taken within 48 hours of symptom onset.
• Most people recover at home with rest, hydration, and over-the-counter medications. However, speak with a healthcare professional if symptoms worsen or don’t improve after several days, especially if you’re over 50, pregnant, have a chronic condition, or have a weakened immune system.

Overview

Influenza, or the flu, can leave you feeling completely wiped out, causing uncomfortable symptoms like a fever, muscle aches, headaches, fatigue, and chills. You’ll likely be wondering when you’re going to start feeling better.

The flu is caused by a virus that moves through your body in a predictable timeline, from when you’re first exposed to the virus to the time you make a full recovery. Let’s take a look at the stages of the flu, as well as how medications may help shorten the timeline.

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Stages of the flu

The typical timeline of the flu can be split into different stages.

Stage 1: Incubation

You can get the flu when a person carrying the virus coughs, sneezes, or talks, sending tiny droplets into the air that you then breathe in. It is also possible to get the flu by touching surfaces carrying the virus and then your nose, eyes, or mouth.

If you’ve been exposed to the flu virus, it’s unlikely that you’ll start to feel sick right away. The period between contracting the virus and starting to show symptoms is known as the incubation period.

For the flu, this period usually lasts around 1 to 4 days.

Stage 2: Symptom onset

You will typically start showing symptoms on day 2 after exposure, though it may be as early as day 1 or as late as day 4. This happens because your immune system is beginning to release antibodies to fight the infection. You might find that you feel progressively worse throughout the day, experiencing classic flu symptoms like:

• headache
• fever
• chills
• body aches

If you need to take antivirals, it’s best to take them in this stage, within 48 hours of symptoms starting. Taking antivirals quickly reduces the multiplication of the virus in your body, which can lower the chances you’ll experience severe symptoms. They also shorten the duration of illness by about 1 day.

Stage 3: Symptoms peak

You might find that your symptoms are at their most severe on day 3 after symptom onset, where you may notice:

• severe congestion and sore throat, making it difficult to talk
• a high fever that makes it difficult to get out of bed
• a dry cough

Acute symptoms of the flu generally last 7 to 10 days in people who are generally otherwise healthy.

Stage 4: Recovery begins

Recovery usually begins after several days of symptoms as your immune system manages to effectively fight the virus. You might still have some symptoms, but your fever will likely have broken. If your symptoms only seem to be worsening, consider reaching out to a healthcare professional.

At this stage, it’s still important to get plenty of rest and stay hydrated to help your immune system as it continues to fight the virus. It’s also a good idea to remain isolated at this stage to avoid passing the virus to anyone else.

Stage 5: Recovery

After about 7 to 10 days, you should feel significantly better, though you may still have a lingering cough or tiredness. You should be able to return to your usual daily activities, but make sure not to overdo it. You can still take it easy if you have to.

When to speak with a doctor

Many people will recover from the flu at home without medical treatment. However, some people may be at higher risk of complications, including:

• people over the age of 50
• people with a chronic health condition
• people with a chronic respiratory condition like asthma
• pregnant people
• people who have a weakened immune system
• very young children

You should speak with a doctor if your symptoms don’t appear to be getting better after several days, or if they get suddenly worse. Seek emergency treatment if you have difficulty breathing.

How long is the flu contagious for?

According to the Centers for Disease Control and Prevention (CDC), the flu virus can be detected in your body as early as 1 day before symptoms develop and up to 5 to 7 days after you start showing symptoms. The virus is likely the most contagious in the first 3 days of your illness.

Note that the flu is still contagious even if you don’t have symptoms like a fever or before your symptoms appear. Some people may have contagious flu for longer periods, including children and people with weakened immune systems.

How is the flu treated?

In many cases, the flu is managed with home remedies like plenty of rest, hydration, and over-the-counter medications like ibuprofen (Advil) to reduce your fever. However, in some cases, doctors might prescribe medications that fight the virus, known as antivirals. There are 4 antiviral medications used for the flu:

• oseltamivir (Tamiflu)
• zanamivir (Relenza)
• peramivir (Rapivab)
• baloxavir marboxil (Xofluza)

These medications come in different forms and strengths. A healthcare professional can help decide which medication is appropriate for you.

It’s important to take antivirals within 48 hours of symptoms starting. This means speaking with a doctor quickly to get a prescription.

Online care services, including Optum Perks Online Care, may make getting treatment easier. With these services, you can submit an online form answering a few questions about your symptoms, and a US-licensed healthcare professional will respond soon after to prescribe a treatment plan.

Preventing the flu

The best way to prevent getting the flu or reduce the risk of complications is to get a yearly flu vaccine. Additionally, if you are ill, stay home to prevent spreading illness to others, wash your hands frequently, cover sneezes and coughs, and wear a mask if needed.

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Summary

The flu is caused by a virus that progresses through your body in predictable stages, from incubation through to symptom development and eventual recovery.

Most people will recover from the flu within about 10 days with rest, hydration, and OTC remedies. However, if your symptoms don’t go away or get worse, speak with a doctor.

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