What is influenza?

Dr Roger Henderson Many viruses can cause a flu-like illness. There is usually a seasonal outbreak of flu (influenza) in the UK each winter. Flu-like illnesses typically cause a high temperature, aches and pains in muscles and joints, a cough and various other symptoms. [https://patient.info/health/influenza-and-flu-like-illness](https://patient.info/health/influenza-and-flu-like-illness)