Flu symptoms 2026–27: what's going around this season

What flu is going around right now (fall 2026)

Not much flu is going around right now. The 2025-26 flu season has officially ended, and CDC surveillance shows activity is low across the US. Flu usually starts to climb in late fall and peaks in winter, so cases may rise again in the coming weeks. If you feel sick now, a cold, COVID-19, or another respiratory virus is more likely than flu. CDC's weekly FluView report tracks which strains are spreading as the new season begins.

Last season, influenza B (the B/Victoria lineage) became the more commonly reported strain late in the season, as described in the recap below.

Last season was shaped mainly by H3N2, most of it a branch called subclade K, and influenza B. H3N2 has been linked to more severe symptoms in older adults and young children, while influenza B tends to cause milder but still disruptive illness, often in younger people. Both strains circulated widely last season.

The flu virus mutates constantly, so symptoms and severity can shift from year to year. The 2026–27 US flu vaccines are trivalent (designed to protect against three flu strains: H1N1, H3N2, and B/Victoria), with all three components updated, including a new H3N2 component targeting subclade K. Breakthrough infections, meaning flu cases in vaccinated people, can still occur, especially among people with weakened immune systems. Flu season timing matters here, since activity usually starts to climb in late fall and peaks in winter.

4 common flu symptoms to watch for in 2026–27

The flu’s hallmark symptoms remain consistent, but subtle changes in how they present can help differentiate flu from other respiratory illnesses like COVID-19 or the common cold. Here’s what to look for:

1. Fever and chills

Most flu cases involve a sudden onset of fever, often above 100.4°F (38°C), accompanied by chills. This rapid temperature rise distinguishes flu from many colds, which usually cause low-grade or no fever. Keep track of your fever: a high fever that lasts more than three days, or that comes back after improving, needs a doctor's review. Chills can often trigger shivering, the body’s way of raising its temperature to fight off the infection.

2. Respiratory symptoms

Cough is typically dry and persistent, sometimes worsening over time. Sore throat and nasal congestion also appear, but are less dominant than in other viral infections. In recent years, there has been an increase in reports of flu-related bronchitis, which can complicate the respiratory symptoms. This bronchial irritation may lead to wheezing or difficulty breathing, underscoring the importance of closely monitoring respiratory health. The flu can exacerbate pre-existing conditions such as asthma or chronic obstructive pulmonary disease (COPD), underscoring the need for vigilance among at-risk populations.

3. Body aches and fatigue

Muscle pain and joint aches are common and can be severe enough to limit daily activities. Fatigue often sets in early and may linger for weeks after other symptoms fade. This profound sense of tiredness can be disheartening, as it often feels disproportionate to the other symptoms. Recent studies suggest that the flu virus can affect the body’s energy metabolism, leading to prolonged fatigue even after the acute phase of the illness has passed. Understanding this aspect of flu recovery can help individuals better prepare for the potential impact on their daily lives.

4. Additional signs

Headaches, loss of appetite, and occasional nausea or vomiting, especially in children, round out the symptom profile. If you notice difficulty breathing, chest pain, or confusion, seek emergency care immediately. Flu symptoms can overlap with those of other illnesses, such as strep throat or pneumonia, which may require different treatment approaches. Tracking symptom progression and monitoring for new developments can support timely medical care. Staying hydrated and resting can aid recovery, making it easier to get through the flu season. Because most flu cases involve a fever but not all of them do, flu symptoms without a fever can still be flu.

Flu B symptoms: what to know

Flu B causes the same core symptoms as other flu viruses: a sudden fever, sore throat, cough, body aches, and headache. Symptoms alone cannot reliably separate flu B from flu A, so only a test can tell you which one you have.

• Fever and chills: Fever often arrives quickly and may come with shivering.
• Sore throat and cough: Both are common, and the cough can linger after the fever breaks.
• Body aches and headache: Muscle soreness and head pain can be strong enough to keep you in bed.

Children may also have nausea, vomiting, or diarrhea (loose, watery stools) more often than adults do. Offer small, frequent sips of fluid, and contact a doctor if your child cannot keep liquids down.

B/Victoria is the only B lineage (a family of related flu viruses) circulating. The 2026-27 flu vaccine includes a B/Victoria component, so vaccination may reduce your risk of getting sick or having a severe illness from flu B.

Flu A (H3N2) vs. flu B symptoms

H3N2 infections often cause high fever, chills, and severe body aches. Patients may also experience a persistent cough and fatigue that persist beyond a typical cold. Influenza B, while generally less severe, can still cause sore throat, headache, and nasal congestion, and sometimes leads to secondary infections such as sinusitis or bronchitis.

Last season recap: subclade K and the late flu B wave

Last season came in two waves. The first, driven by H3N2 subclade K, produced the winter peak. Subclade K emerged after the vaccine strains were chosen and had drifted (changed genetically) from the H3N2 component in the 2025-26 vaccines. It made up about 84–90% of subtyped H3N2 in 2025–26.

A separate influenza B (Victoria) wave ran from mid-February into spring 2026, which extended the flu season for many families. Influenza B, mainly the B/Victoria lineage, became the more commonly reported strain late in the season. Overall activity then declined, though it stayed active in some parts of the country.

CDC rated 2025–26 as moderate overall, with high severity for children, with a cumulative hospitalization rate of about 90 per 100,000 people. As of early October 2026, 198 pediatric flu deaths had been reported to CDC for the season. Flu viruses change from year to year, so the strains that spread this fall may differ from last season's.

Does the 2026–27 flu shot match?

Yes, the 2026-27 flu shot was updated to match the viruses that dominated last season. All US flu vaccines are trivalent (they protect against three flu viruses: H1N1, H3N2, and B/Victoria), and all three components were updated. The new H3N2 component targets subclade K, the variant that emerged after last season's vaccine strains were chosen. The B/Victoria component is also new.

• Who should get it: Everyone 6 months and older.
• Best timing: September to October is ideal, so protection is in place before flu activity climbs in late fall.
• What to expect: A closer match may lower your risk of getting flu and of severe illness, but you can still get sick. Flu viruses keep changing, so a vaccine can never match every circulating strain perfectly.

If you are unsure which vaccine type fits you, such as a high-dose option for older adults or the nasal spray for eligible people, a doctor or pharmacist can help you choose.

When to see a doctor and get treated

See a doctor as soon as flu symptoms start, ideally within 48 hours. Antiviral medicines (prescription drugs that slow the flu virus) work best when started early, and they may shorten your illness and lower the risk of complications.

CDC recommends treatment even after 48 hours if any of these apply:

• High-risk group: Seniors, young children, pregnant women, and people with chronic conditions such as asthma or COPD (long-term lung disease).
• Hospitalized: You are in the hospital with flu.
• Severe illness: Your symptoms are serious or getting worse.

CDC flagged that antivirals were under-used during the 2025–26 season. If you are unsure whether your symptoms qualify, ask a clinician rather than waiting it out. Online care can assess your symptoms and, where appropriate, prescribe Tamiflu (oseltamivir) or Xofluza (baloxavir) without a trip to a crowded clinic.

Antibiotics do not treat flu itself. They only help if a separate bacterial infection develops.

Using telehealth for quick flu diagnosis

Telehealth provides immediate access to medical expertise from home. An AI-powered system can offer free initial assessments that synthesize the latest medical research to provide personalized advice in seconds. Patients can also schedule low-cost video visits with licensed doctors available 24/7 across all 50 states.

This approach is especially helpful during flu season when clinics may be crowded or when you want to avoid exposing others. Doctronic’s AI remembers your medical history, making follow-up visits more efficient and tailored to your needs. Antiviral medicines work best when started early, so recognizing early flu symptoms and calling a doctor within 48 hours gives you the most treatment options. If you have flu symptoms and want to start treatment without a trip to a crowded clinic, you can ask a clinician about getting Xofluza online after a virtual assessment.

Signs you should visit an urgent care or ER

• Difficulty breathing or shortness of breath
• Persistent chest pain or pressure
• Sudden dizziness or confusion
• Severe vomiting or inability to keep fluids down
• High fever lasting more than three days despite treatment

While Doctronic does not provide a list of urgent care centers, their telehealth service can guide you on when in-person care is necessary.

Managing flu symptoms at home

Vaccination remains the most effective way to prevent flu infection or reduce its severity. CDC recommends the 2026–27 flu shot for everyone 6 months and older.

Home care tips for flu relief

• Rest and stay hydrated with water, herbal teas, or broths
• Use over-the-counter medications like acetaminophen or ibuprofen to reduce fever and aches
• Maintain good hygiene, including frequent handwashing and covering coughs
• Isolate yourself to prevent spreading the virus to others

If symptoms worsen or do not improve after a few days, consult a healthcare provider through telehealth or in person.

How to protect yourself in the 2026–27 season

Understanding the flu’s behavior this year empowers you to take timely action. Recognize the symptoms, protect yourself with vaccination, and use trusted Doctronic for fast, expert medical advice. This flu season, staying informed and prepared can keep you healthier and more confident in managing your care.

Frequently Asked Questions

What are the main flu strains to watch for this year?

The 2026-27 season is just starting, so it is too early to say which strains will dominate. Last season was driven by H3N2 subclade K, followed by a late influenza B (Victoria) wave. The 2026-27 vaccines include a new H3N2 component targeting subclade K and a B/Victoria component.

How quickly do flu symptoms appear after exposure?

Symptoms typically develop 1 to 4 days after exposure to the virus.

Can the flu be confused with COVID-19?

Yes, symptoms overlap, but flu usually causes sudden fever and body aches, while COVID-19 may have unique signs like loss of taste or smell.

Is telehealth a good option for diagnosing the flu?

Absolutely. Doctronic provides fast, accurate assessments and access to doctors without leaving home.

When should I seek emergency care for flu symptoms?

If you experience difficulty breathing, chest pain, or confusion, go to the emergency room immediately. A high fever lasting more than three days despite treatment also calls for urgent care or ER evaluation.

The Bottom Line

Flu activity is low right now and usually climbs in late fall. Flu B symptoms overlap closely with flu A's, so only a test can confirm which one you have. Antivirals work best when started early, and emergency care is needed for trouble breathing, chest pain, or confusion.