Flu (Influenza)
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Flu (influenza) is a contagious viral infection that affects the respiratory system, including the nose, throat, and lungs. It often develops suddenly and can make you feel significantly unwell. Common symptoms include a high temperature, muscle aches, fatigue, headaches, and a cough.
Flu viruses spread easily from person to person through coughs, sneezes, close contact, and contaminated surfaces.
Most healthy adults start to recover within a week, although tiredness and weakness can sometimes last longer.
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Typical Sick Leave Duration
1-3 days depending on severity. Our doctor will assess your situation and recommend appropriate time off.
Is Flu a Valid Reason for a Sick Note?
Yes, flu can be a valid reason for a sick note if symptoms are severe enough to prevent you from carrying out your normal work duties safely and effectively.
Flu often causes significant fatigue, fever, muscle aches, and general weakness, which may make it difficult to work, particularly in physically demanding roles or jobs involving close contact with others.
💡Good to Know
Employers in Ireland cannot require you to disclose the specific nature of your illness. Your sick note will confirm you are unfit for work without necessarily detailing your diagnosis, protecting your medical privacy under GDPR.
When Should You See a GP in Person?
- Your symptoms do not start to improve after 7 days
- You are 65 or over
- Your symptoms suddenly become worse
- You have difficulty breathing or shortness of breath
- You have chest pain
- You cough up blood
- You develop severe dehydration
- You are worried about your child’s symptoms
- You are pregnant and develop flu symptoms
- You have a long-term health condition, such as diabetes or a heart, lung, or kidney disease
- You have a weakened immune system
Frequently Asked Questions
How Do You Know If It's Flu or a Cold?
Flu usually comes on suddenly and often causes a high temperature, muscle aches, headaches, and extreme tiredness. A cold typically develops more gradually and mainly causes symptoms affecting the nose and throat, such as sneezing, a runny nose, and a sore throat.
Can Antibiotics Treat Flu?
No. Antibiotics do not work against flu because flu is caused by a virus rather than bacteria. Antibiotics are only effective against bacterial infections.
What Helps You Recover From Flu Faster?
Rest, drinking plenty of fluids, eating nourishing meals, and taking medicines such as paracetamol or ibuprofen for fever and aches may help relieve symptoms while your body recovers.
Are You Contagious for the Entire Flu?
You can spread the flu to other people from around 1 day before symptoms begin and for several days after becoming ill. Most adults remain contagious for about 5 to 7 days after symptoms start.
Should I Stay at Home If I Have the Flu?
Yes. If you have the flu, it is generally advisable to stay at home and avoid close contact with others until you feel better and no longer have a high temperature. This helps reduce the risk of spreading the virus to family members, colleagues, and vulnerable individuals.
How Can You Prevent Flu?
You can reduce your risk of getting flu by having the annual flu vaccine if eligible, washing your hands regularly, avoiding touching your face, covering coughs and sneezes with a tissue or your elbow, and avoiding close contact with people who are unwell. Cleaning frequently touched surfaces may also help reduce the spread of flu viruses.