As autumn sets in, health officials are warning of a fresh seasonal surge in both flu and Covid-19. With both illnesses spreading at the same time of year and sharing many symptoms, it can often be difficult to know which virus is responsible when you start feeling unwell. Understanding the differences, the risks, and the available protections is more important than ever.
How Flu and Covid-19 Symptoms Overlap
A simple sniffle or sore throat may at first feel like a harmless cold, but doctors caution that lingering symptoms can point to either flu or Covid-19. Since both viruses affect the respiratory system, people often confuse one for the other. However, there are notable differences in how the illnesses begin, progress, and impact the body.
Do I Have Covid-19?
Covid-19 continues to pose health challenges, particularly for vulnerable groups such as older adults, care home residents, and people with pre-existing medical conditions. The virus is still evolving, with new variants emerging regularly. Transmission occurs easily through coughs, sneezes, or even casual conversation, making it highly contagious in indoor environments.
Symptoms of Covid-19 in 2025
The list of Covid-19 symptoms has changed since the virus first appeared in 2020. While the initial focus was on fever, a persistent cough, and loss of taste or smell, many people today report symptoms similar to a common cold. These include:
Runny or blocked nose
Sore throat or hoarseness
Headaches and fatigue
Shortness of breath
Persistent cough
Fever or chills
Stomach upsets such as nausea or diarrhoea
Doctors have observed that a hoarse throat has become one of the hallmark signs of recent Covid-19 strains.
New Variants and Vaccine Boosters
A recently identified strain known as Stratus, with variants XFG and XFG.3—has been linked to a large proportion of new cases. Experts, however, stress that mutations are a normal part of viral behaviour and do not necessarily mean the disease is becoming more dangerous.
To reduce the risk of hospitalisation, health authorities are encouraging eligible groups to get their Covid-19 booster this autumn. This includes:
Adults aged 65 and over
Care home residents
Individuals with underlying health conditions
People with weakened immune systems
Do I Have the Flu?
Unlike Covid-19, flu is not a new illness—but it remains a serious threat every winter. Flu is a respiratory infection that can strike suddenly, often leaving sufferers bedridden with exhaustion, fever, and muscle aches.
Flu vs Common Cold
While colds usually cause a runny nose, sneezing, watery eyes, and mild discomfort, flu symptoms are typically more severe and appear quickly. Signs of flu include:
High fever
Sudden tiredness and weakness
Muscle and joint aches
Severe headaches
Dry cough and sore throat
Hospitalisations and Deaths Linked to Flu
Flu is far from harmless. Last winter alone, more than 8,000 people were hospitalised in the UK, and over the past two years, at least 18,000 deaths have been linked to the virus. Children, the elderly, pregnant women, and people with chronic health conditions remain at the highest risk of complications.
The Role of Flu Vaccination
The flu vaccine is the most effective defence. Research shows that last year’s jab reduced hospital admissions by almost a third among older adults and by more than half in children aged two to 17.
This autumn, the flu vaccine is being offered free to:
Adults over 65
Pregnant women
Children aged 2 and 3 through their GP
Schoolchildren from reception to year 11 (via nasal spray)
Adults under 65 with long-term medical conditions
Are Cases Rising This Autumn?
According to the UK Health Security Agency (UKHSA), cases of both flu and Covid-19 appear to be climbing as the country moves into the colder months. By 10 September, coronavirus cases in England had risen by 7.6% compared to the previous week.
Other seasonal viruses, such as RSV (respiratory syncytial virus) and norovirus, are also expected to circulate widely during autumn and winter.
Why Autumn and Winter Increase the Risk
Experts explain that viruses spread more easily in colder weather because people spend more time indoors with less ventilation. Shared spaces such as schools, offices, and public transport can quickly become hotspots for transmission.
Protecting Yourself and Others
Health officials are urging everyone eligible to take up their flu and Covid-19 vaccinations to ease pressure on hospitals and protect vulnerable groups. Alongside vaccination, simple measures such as regular handwashing, good ventilation, and staying home when sick remain important defences.
Bottom Line
Both flu and Covid-19 can be dangerous, but vaccines and early awareness are powerful tools in reducing severe illness and preventing hospitalisation. As seasonal viruses continue to circulate, knowing the symptoms, taking preventive measures, and seeking medical help when necessary can make all the difference this autumn.
