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Hay fever is an allergic reaction to airborne allergens that can occur at any time of the year.

People who have asthma or hay fever can get severe asthma symptoms during pollen season when high grass pollen counts combine with a certain type of thunderstorm.

Egg allergy is one of the most common causes of allergies in children with symptoms ranging from mild to life-threatening reactions.

Pollen allergies cause seasonal hay fever and asthma and can be treated with antihistamines, nasal sprays or asthma medication

Thunderstorm asthma is triggered when there is high amounts of grass pollen in the air. It can result in people wheezing, feeling short of breath, and tight in the chest with coughing.

Henoch-Schonlein purpura causes a purple spotted skin rash which lasts around one to four weeks, and is often marked by relapses.

Allergies occur when our body overreacts to a 'trigger' or allergen. Common allergies include hay fever, asthma, hives and food allergy.

Professor McDonald explains thunderstorm asthma

Many people with asthma find their symptoms can worsen when they are exposed to certain allergens like house dust mite, animal dander, pollen and mould.

Allergy occurs when the body overreacts to a 'trigger' that is harmless to most people.