The cold is one of the most common respiratory infections. Both the common cold and influenza are caused by viruses and spread through droplets from coughing, sneezing, or contact — but they are different groups of viruses with different severity. Knowing how to tell them apart helps you care for yourself the right way and not panic unnecessarily.
Get to know the diseases and their causes
The common cold is caused by hundreds of different viruses, most commonly rhinovirus. Symptoms usually come on gradually, starting with a mild sore throat, then a runny nose, nasal congestion, sneezing, and cough. Most cases have no fever or only a low-grade fever, and resolve on their own.
Influenza is caused by influenza viruses. Symptoms usually "come on faster and more severely" — a sudden high fever, severe body aches, headache, and fatigue so bad you can barely get up, possibly with a runny nose and cough as well. Influenza is more likely to lead to complications such as pneumonia, especially in high-risk groups.
Symptoms — how to tell them apart
- Onset: the common cold comes on gradually, bit by bit, while influenza comes on fast within a few hours.
- Fever: the common cold usually has no fever or a low one, while influenza usually has a high fever of 38–40°C.
- Body aches/fatigue: mild with the common cold, while marked aches and fatigue are prominent with influenza.
- Runny nose/sneezing/congestion: prominent symptoms of the common cold; influenza can have them too, but less prominently.
Caring for yourself
Most colds can be managed symptomatically at home and do not require antibiotics, because antibacterial drugs do not work against viruses. The key principles of care are to rest so the body can recover and to prevent dehydration.
- Rest enough and drink warm water often to help loosen phlegm and avoid dehydration
- Use a fever/pain reliever such as paracetamol at the appropriate dose; rinse the nose with saline to ease congestion
- Wear a mask and keep away from others while you have symptoms, to reduce the spread to those around you
Antibiotics are not needed for a common cold
Almost all colds are caused by viruses. Taking antibiotics unnecessarily does not help you recover faster, but instead increases the risk of antibiotic resistance and side effects. They should only be used when a doctor diagnoses a complicating bacterial infection.
Prevention
You can prevent colds with simple basics: wash your hands often with soap, avoid touching your eyes, nose, and mouth, wear a mask in crowded places during outbreaks, and rest and eat a balanced diet to support your immunity. For influenza, getting vaccinated every year — especially young children, the elderly, pregnant women, and those with underlying conditions — greatly reduces both the chance and the severity of illness.
At Doctor Chat Clinic a doctor examines and treats colds and respiratory infections, with blood-draw testing for infection where necessary, and influenza vaccines for prevention. If you are unsure which type of cold you have, or your symptoms are not improving, you can consult us.
Danger signs that mean you should see a doctor promptly
- A high fever lasting more than 2–3 days, or a fever that subsides then returns high with worsening symptoms
- Difficulty breathing, breathlessness, chest pain, or coughing up phlegm with blood
- Becoming lethargic or confused, drinking little so urine output is low, or signs of dehydration
- High-risk groups — young children, the elderly, pregnant women, and those with underlying conditions — should see a doctor promptly with a high fever or severe aches