There are various allergic reactions. The most frequent and well-known are:

• Allergic rhinitis (hay fever)
• Allergic asthma
• Atopic dermatitis
• Allergic contact dermatitis

Prevalence of allergic diseases:

• Allergic rhinitis (hay fever)  15 – 25 %
• Allergic asthma  5 – 15 %
• Atopic dermatitis  10 – 20 %
• Allergic contact dermatitis  6 – 10 %

What are the consequences?

With a prolonged duration of the disease, there is a high risk of a more frequent occurrence and an increased severity of symptoms in all types of allergies. An initially only rarely occurring allergic rhinitis can develop into a chronic non-allergic asthma. An allergic eczema of the hands can become chronic as well and is one of the most frequent causes of occupational disability.