Fever is a symptom, not a diagnosis. In an otherwise healthy adult, a fever of two or three days with a clear cold or throat infection usually needs rest, fluids and paracetamol.
Come in the same day if
- Fever above 39°C that does not come down with paracetamol
- Breathlessness, chest pain, or confusion
- A rash that does not fade when you press it
- Fever with severe headache and neck stiffness
- You are diabetic, pregnant, over 65, or on medication that lowers immunity
Please do not
Start antibiotics on your own or on a chemist's suggestion. Most fevers here are viral, antibiotics do nothing for them, and a partly treated infection is considerably harder for me to diagnose afterwards.