From: Internet-based surveillance of Influenza-like-illness in the UK during the 2009 H1N1 influenza pandemic
1.
Blocked/runny nose
2.
Cough
3.
Sore throat
4.
Headache
5.
Muscle pain and/or joint pain
6.
Chest pain
7.
Stomach ache
8.
Diarrhoea
9.
Nausea
10.
Chills
11.
Weakness
12.
Eye irritation
13.
Fever
14.
No symptoms