This category contains different factors whose nature is not understood or only partially understood.
Sometimes allergic-like symptoms may be an expression of a background disease:
In this category, we can divide the causes of allergic symptoms into two:
Allergy to the venom injected during the sting of a honey bee, hornet or wasp poses a significant risk among those persons allergic to these substances.
Less dangerous but very common insect sting allergies are, for example, allergies to mosquito bites, which may pose a significant health problem.
Different materials that come to contact with us may elicit allergic reactions in some persons, among them:
Drugs cause allergies in some persons and can cause life-threatening reactions. Among the common drugs responsible for allergic reactions:
Penicillins.
Aspirin and pain-killers from the NSAIDS group: such as ibuprofen.
Anti-epilepsy drugs.
However, in principle, any drug can cause allergic reactions.