Causes Of Allergic Reactions And Allergy Symptoms

The most common allergens are those that affect the airways, such as pollen or mites. In this article, we will take a closer look at what causes allergies and common allergy symptoms.
Causes of allergic reactions and allergy symptoms

It is very common to be allergic to something, whether it is pollen, mites, gluten or something else. It is something that affects a large part of the population. Today, it is almost a rarity to come across a person who has not experienced allergic reactions to something.

It is estimated that one in four have some form of allergy during their lifetime. In fact, it is one of the most common diseases in childhood.

An allergy refers to the hypersensitivity of the immune system to a substance that causes changes in the airways, digestive system, nervous system or in the skin. In other words , it is an abnormal immune system reaction to a substance that would not normally trigger this reaction. Overall, a person may be allergic to any substance.

But do you know why this occurs? In this article, we explain why allergic reactions occur, how they are diagnosed as well as common allergy symptoms.

Woman sneezes due to allergy

What do allergic reactions mean?

The immune system works continuously as it recognizes and eliminates bacteria from the body to protect it from diseases. Sometimes, however, its defense mechanisms change.

When this occurs, the system is activated very strongly against certain elements that are actually harmless. In other words, it activates many defense mechanisms – such as sneezing – against a substance that does not cause disease. This can be pollen, for example.

Allergy symptoms can be different depending on the substance you are allergic to. If you are allergic to dust mites, you are likely to suffer from respiratory symptoms. One can cough, sneeze, have eyes that run in water, as well as many other things.

Common allergy symptoms

As we mentioned above, allergy symptoms depend on the type of allergy in question. Your symptoms may also depend on whether you have been in contact with the substance by eating it, touching it or inhaling it. 

The most common allergic reactions are associated with the respiratory tract. Therefore, the most common symptoms are allergic rhinitis (hay fever) and eye inflammation.

Hay fever causes the nose to itch, to sneeze, to have a stuffy nose and to run constantly. Allergic eye inflammation is an intense itching in the eyes that causes the eyes to also run in water. Those who suffer from this often feel that they have sand in their eyes.

In addition, it is important to mention that allergic reactions are often associated with asthma. People who suffer from asthma experience coughing, wheezing and breathing problems.

Food allergies

When you are allergic to a food, the most common symptoms you experience are that it tickles or itches in the mouth, which can also reach the throat. You may also find that your lips, tongue or face swell up. In addition, you can get a rash after eating the food. You may also experience diarrhea, vomiting and flatulence (flatulence). 

The foods that cause most allergic reactions are milk, nuts and eggs.

Allergic reactions to medicines

Many people are allergic to certain types of medication. In fact, doctors should ask if one is allergic to anything before prescribing. This type of allergy is often accompanied by skin reactions such as rash and itching. 

Person being tested for allergies


Anaphylaxis occurs when allergic reactions are extremely severe. What happens is that the immune system releases substances that suddenly lower blood pressure. The airways become narrower and it becomes more difficult to breathe.

It can occur very quickly after you have been in contact with the substance to which you are allergic. For example, it is relatively common in those who are allergic to bee stings.

When you experience anaphylaxis reactions, your heart rate increases and you become more weakened. In addition, there is a rash on the skin as well as nausea and vomiting. In these cases, it is important to go to the emergency room. 


Many people are allergic to various substances. Therefore, it is important to know the most common allergy symptoms. Thereby, you can help your doctor find out what it is that is causing the allergic reactions so that you can avoid the allergen.

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