Flu vs Allergies: Spotting the Difference
The flu and allergies are easy to confuse for the first day, but they diverge quickly.
Quick comparison
| Flu | Allergies | |
|---|---|---|
| Fever | High, sudden | None |
| Body aches | Severe | None |
| Fatigue | Intense | Mild to moderate |
| Sneezing | Sometimes | Frequent |
| Duration | 5–7 days | Ongoing with exposure |
Key differences
- Flu starts suddenly with a high fever.
- Allergies build gradually and don't cause aches.
- Flu is contagious; allergies are not.
Common symptoms
CoughSore throatCongestion
When to seek help
- High fever above 101°F.
- Severe body aches or chills.
- Trouble breathing.
FAQ
Can I have both at once?+
Yes — allergies can flare while you also have the flu, which can make symptoms worse.