Some of the most common allergy symptoms are constant coughing, sniffling, excessive mucus formation and a blocked nose. This can lead to or be associated with a variety of diseases of the airways, such as asthma, bronchitis, hay fever, and sinusitis. The most serious and life-threatening of these is undoubtedly asthma.
Even with earlier diagnosis and more hospitalisation, deaths from asthma have tripled and the number of new cases diagnosed each year has increased by 160% since 1980.