What can be done?
To mark Allergy Week this week, the charity has released research showing people affected by allergies often feel let down by the NHS.
Allergy UK warns: "Britain is facing an allergy epidemic made worse by poor NHS resources.
"The research found many adult sufferers and parents of children with allergies are left to manage their allergies, some of which can be life-threatening, with little advice, knowledge or support."
To help tackle the problem, Allergy UK has launched a nationwide fundraising appeal to raise PS1m to provide specialist allergy nurses across the UK.
The nurses would work with health services to help the millions of people suffering from allergies.