Flu vs common cold: Do you need a flu shot?

Affinity Health is urging the public to understand the difference between the flu and the common cold during African Vaccination Week (24 to 30 April), and to consider whether a flu vaccination could help protect themselves and their loved ones this season.

• Also read: Five tips to keep babies and kids safe from flu

Every year, as temperatures drop, sniffles, coughs and body aches become more common. Many people use “flu” and “cold” interchangeably, but they are different illnesses. Knowing the difference can help you decide when to rest at home and when to seek medical care or vaccination.

Flu vs Common Cold: What’s the difference?

Both flu and the common cold are respiratory illnesses caused by viruses, but different viruses are responsible and symptoms vary in severity. The common cold is usually caused by rhinoviruses, with symptoms that develop gradually and are generally mild. These may include:
• Runny or blocked nose
• Sneezing
• Mild sore throat
• Light cough
• Slight tiredness

Most people recover within seven to 10 days without complications.

The flu (influenza), caused by influenza viruses, is usually more severe and comes on suddenly. Symptoms may include:
• High fever (often above 38°C)
• Chills and sweating
• Severe body aches and muscle pain
• Headache
• Extreme fatigue
• Dry, persistent cough
• Sore throat

While a cold causes mild discomfort, flu can leave a person bedridden and may lead to serious complications such as pneumonia, bronchitis, sinus infections, or worsening of chronic conditions like asthma, heart disease or diabetes.

According to the World Health Organization (WHO), seasonal influenza causes millions of severe cases globally each year and hundreds of thousands of respiratory-related deaths, making vaccination one of the most effective forms of protection.

Why the flu can be dangerous

For most healthy adults, flu can be managed at home with rest and fluids. However, higher-risk groups include adults over 65, pregnant women, young children, people with chronic conditions, and those with weakened immune systems.

In these cases, flu can quickly become serious and may require hospitalisation. Because influenza viruses change annually, previous infection or last year’s vaccine may not provide full protection – hence the need for yearly updated vaccines.

Do you need a flu shot?

Flu vaccination is widely recommended, especially for high-risk groups. Even healthy individuals benefit, as vaccination helps reduce community spread and protects vulnerable people.

The flu shot:
• Reduces risk of infection
• Lessens severity if you do get sick
• Lowers risk of hospitalisation
• Protects vulnerable family members

Importantly, the flu vaccine does not cause flu. Some may experience mild side effects such as soreness, slight fever or fatigue, which are far less severe than influenza.

Protection develops about two weeks after vaccination, so early vaccination before peak season is advised.

When is it “Just a Cold”?

A cold usually develops slowly and mainly affects the nose and throat. The flu comes on suddenly and is more severe, often with high fever, body aches and extreme fatigue.

Seek medical attention if symptoms include shortness of breath, chest pain, persistent high fever, confusion, or if symptoms worsen after initially improving – especially in high-risk individuals.

Preventing both flu and colds

While the flu vaccine protects against influenza, good hygiene helps prevent both illnesses:
• Wash hands regularly with soap and water
• Use hand sanitiser when needed
• Cover mouth and nose when coughing or sneezing
• Avoid close contact with sick people
• Stay home when ill

The bottom line

A cold is usually mild, while flu can be serious. Understanding the difference helps with timely care and prevention. If unsure about vaccination, consult a healthcare professional for personalised advice.

As African Vaccination Week highlights, prevention is better than cure.