Public Health Wales Flu Campaign

The following information relates to the 2025-26 flu season

Flu can be very serious. It is caused by a virus, which is spread by coughs and sneezes. Symptoms of flu can be mild but can also lead to more serious illnesses such as bronchitis and pneumonia (lung infections), which may need treatment in hospital. 

Flu is very infectious, and symptoms can come on very quickly. Symptoms of flu include a high temperature, tiredness and weakness, headache, aches and pains and a cough.

More information about the 2025-26 flu campaign in Wales is available here.