Blocked nose, sore throat, aches, cough — but which one is it? Cold, flu and Covid overlap heavily, and you can’t tell them apart with certainty without a test. But the pattern of symptoms — especially how fast they arrive — gives strong clues. Here’s how our pharmacists think it through, plus an interactive checker.
What does it look like?
Pick the description closest to what you’re feeling.
That pattern points to a common cold. Rest, fluids, paracetamol, a decongestant if you’re blocked — and it should ease within a week to ten days. Antibiotics do nothing here. Call into us and we’ll match the remedy to your actual symptoms rather than the biggest box.
Sudden and systemic is the signature of flu. Plan for a week of rest, fluids and paracetamol/ibuprofen for the aches and fever. If you’re in a higher-risk group (60+, pregnant, long-term condition) and it’s early, contact your GP promptly — antiviral treatment works best started fast.
That combination warrants a Covid test — changed taste or smell in particular. Antigen tests are available at the pharmacy. If positive: rest, fluids, paracetamol, and stay home while infectious. Higher-risk? Contact your GP early — antiviral options exist for those who qualify.
A post-viral cough can linger 3–4 weeks and is usually harmless. But a cough lasting beyond 3–4 weeks, coughing blood, chest pain or breathlessness needs your GP — no exceptions. Otherwise, see our guide to cough medicines that actually work.
The side-by-side comparison
| Cold | Flu | Covid | |
|---|---|---|---|
| Onset | Gradual (days) | Sudden (hours) | Varies (2–14 days after exposure) |
| Fever | Rare, mild | Common, high | Common |
| Aches | Mild | Severe | Common |
| Sneezing / runny nose | Very common | Sometimes | Sometimes |
| Exhaustion | Mild | Severe, immediate | Common, can linger |
| Taste/smell changes | With blocked nose | Rare | Distinctive when it happens |
See a doctor urgently — whatever the virus — for difficulty breathing, chest pain, confusion, a rash that doesn’t fade under a glass, coughing blood, or symptoms that improve then suddenly worsen. In babies, the elderly and pregnant women, be quicker to call.
What actually helps (and what doesn’t)
- Helps: rest, fluids, paracetamol/ibuprofen, decongestant sprays (max 7 days), honey and lemon for cough, lozenges for throat.
- Doesn’t: antibiotics (these are all viruses), “sweating it out”, doubling up on combination cold remedies that all contain the same paracetamol.
- Prevents: the flu vaccine — free for most of the people flu hits hardest.
Describe your symptoms to us
Message us what you’re feeling and our pharmacists will tell you what would genuinely help — and just as importantly, when it’s one for the GP instead.
Reviewed by Deirdre O’Donovan MPSI, pharmacist (registered since 1981), Laois Pharmacy, Portlaoise — July 2026.
