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

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

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.

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.

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

Find out when thunderstorm asthma events take place, risks, symptoms and how to protect yourself and others. What people with hay fever and asthma should know.

Watch the video where medical experts, Dr Michael Sutherland and Professor Frank Thien, explain who is at risk of thunderstorm asthma.

If you have an allergy, visit your doctor before you travel, especially if you are at risk of a severe allergic reaction (anaphylaxis) or an asthma attack.

Although nearly all of us will experience a headache during our lifetime, persistent headaches need to be medically investigated with tests such as scans, eye tests or sinus x-rays.

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