What Are The Symptoms Of An Allergic Reaction

What Are The Symptoms Of An Allergic Reaction

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You can experience quite common daily symptoms that, in reality, are caused by allergy. Even more serious conditions, such as asthma attacks, may also have an underlying allergic cause. Here you will know a series of typical symptoms that are often a sign of allergy.

The symptoms of the allergy vary according to complexity, severity and manifestation. In the case of atopic allergies, the effect of exposure to an allergen can be immediate. Symptoms may be mild or severe, including itching of the eyes, eczema, rhinitis, conjunctivitis, bronchoconstriction, vomiting, diarrhea and, in exceptional cases, anaphylaxis.

Chronic reactions

Some reactions, such as skin reactions (eczema) or asthma attacks, may be caused by allergy. For example, continuous inflammation of the lung tissue may be the reason for the asthma attack observed after exposure to the causing allergen. Asthma attacks can also be triggered by episodes other than reactions of IgE origin.

The manifestations may vary

The manifestations of atopic disease vary considerably according to the allergen involved and the age of allergic people. During breastfeeding, food allergies are the most common (particularly egg and milk). After 3 years, most allergic children tolerate these foods, while allergy to inhalants becomes predominant. Occasionally, some specific IgE antibodies precede allergy symptoms, but over time, they align with clinical symptoms.

What Are The Symptoms Of An Allergic Reaction

More information about specific allergy symptoms:

Eczema

Symptom

  • Dry Skin
  • Itchy skin
  • Urticaria
  • Acne

Common triggers (allergens)

  • food (eg, eggs, milk, fish, wheat, peanuts, soybeans and hazelnuts)
  • house mites
  • domestic animals (eg, cats, dogs, guinea pigs and rabbits)

Why do the symptoms appear?

Eczema can appear as a result of exposure to allergens. It can also increase sensitivity to triggers because the natural barrier of the skin is damaged. Eczema in children can also be associated with an increased risk of developing rhinitis (or hay fever) or asthma later in life.

Generalities of eczema

Eczema is a disorder that affects both children and adults. It appears more frequently during the first years of childhood. Young children often have eczema on the cheeks, on the torso and / or on the arm and leg joints.

There is no treatment for eczema, but it is important to apply a lotion, as well as to investigate its cause. With a clear diagnosis and good advice from your doctor, the patient will be better prepared to face and eliminate some of the most unpleasant effects.

Hay Fever (allergic rhinitis)

Symptom

  • Nasal congestion
  • Breathing through the mouth (only)
  • Itchy nose
  • Itching of the throat / mouth / lips.
  • Itching and redness of the eyes and swollen eyelids
  • Mucus
  • Sneezing
  • Inflammation of the mouth / respiratory tract
  • Crying eyes

Common triggers (allergens)

  • Pollen (eg, trees, weeds and grass)
  • House mites
  • Cockroaches
  • Domestic animals (eg, cats, dogs, guinea pigs and rabbits)
  • Other animals (eg, horses and birds)

Why do the symptoms appear?

Hay fever (allergic rhinitis) occurs when airborne allergens trigger an inflammation that causes the production of fluids in the nose, sinuses and eyes. Rhinitis is usually seasonal and appears in the pollen seasons, but it can also be permanent and persist throughout the year.

Generalities of hay fever

Hay fever or allergic rhinitis is a very common disease that is often confused with the common cold. However, rhinitis can lead to more serious problems such as asthma. Recurrent or lasting symptoms should always be investigated.

Inflammation of the eyes

Symptom

  • Itching and redness of the eyes and swollen eyelids
  • Crying eyes

Common triggers (allergens)

  • pollen (eg, trees, weeds and grass)
  • House mites
  • cockroaches
  • domestic animals (eg, cats, dogs, guinea pigs and rabbits)
  • other animals (eg, horses and birds)

Why do the symptoms appear?

The inflammation of the eyes related to hay fever (allergic rhinitis) is usually seasonal and appears in the pollen seasons, but it can also be permanent and persist throughout the year.

Generalities of eye inflammation

Conjunctivitis is an inflammation of the outer layer of the eyeballs that may appear as a result of exposure to allergens or because of a common cold infection. Eye inflammation or conjunctivitis often appears at the same time as hay fever (allergic rhinitis).

Gastrointestinal disorders

Symptom

  • diarrhea
  • stomachache
  • nausea and vomiting
  • weightloss

Common triggers (allergens)

Babies and toddlers (0-3 years old)

  • eggs
  • milk
  • wheat
  • soy

Children and adults

  • eggs
  • milk
  • shellfish
  • wheat
  • peanuts
  • hazelnuts and other nuts
  • fruits and vegetables

Why do the symptoms appear?

The symptoms are closely related to the ingestion of food. However, making a correct diagnosis can be difficult because gastrointestinal problems can be due to several possible causes, such as allergy, celiac disease or lactose intolerance.

Generalities of gastrointestinal disorders

Allergy can cause stomach and intestinal problems such as pain, diarrhea and vomiting, both in adults and children, even in the first year of life.

Urticaria

Symptom

  • urticaria
  • acne

Common allergens

  • nuts
  • shellfish
  • eggs
  • milk

Why do the symptoms appear?

Urticaria can be both allergic and non-allergic, and is very frequent. Allergy is a more common cause of urticaria in children than in adults.

In addition to allergy to food or other substances such as some drugs, hives may be caused by direct physical stimulation caused, for example, by extreme temperatures, water, sun and physical exercise. Viral infections and stress can also cause the appearance of urticaria.

Generalities of urticaria

Urticaria appears in the form of localized, pale, pinkish-colored hives (bulges) that produce itching and can also cause burning or stinging. They can appear in isolation or in groups in any region of the skin. Most episodes of hives disappear quickly after a few days or a few weeks.

Oral Allergy Syndrome

Symptom

  • itchy throat
  • itching in the mouth
  • itchy lips

Common triggers (allergens)

  • fruits (eg, apple, pear, cherry, peach, plum, apricot and kiwi)
  • vegetables (eg, carrots, raw potatoes and celery)
  • nuts and legumes (eg, hazelnut, cashew, walnut and almond, peanut, soy)

Why do the symptoms appear?

Oral allergy syndrome (OAS) can occur in people who are allergic to pollen when they eat certain fruits, vegetables, nuts and beans. The symptom appears because pollen contains proteins of similar structure to those present in that particular food. This is called cross-reactivity.

The ODS is not, therefore, an independent food allergy, but represents a cross-reactivity between pollen and certain fruits and vegetables. It is usually limited only to the ingestion of raw fruits and vegetables.

Generalities of oral allergy syndrome

Oral allergy syndrome (OAS) is common among patients allergic to pollen. It is usually a temporary and relatively mild disorder that causes inflammation, redness and itching in the mouth area. Occasionally, it also affects the eyes.

Asthma

Symptom

  • cough
  • difficulty breathing
  • panting and wheezing

Common triggers (allergens)

  • pollen (eg, trees, weeds and grass)
  • house mites
  • cockroaches
  • domestic animals (eg dogs and cats)
  • other animals (eg, horses and birds)
  • foods

Why do the symptoms appear?

Asthma symptoms appear due to exposure to allergens, exercise, cold air, dry air and respiratory tract infections. Other irritants, such as strong essences or cigarette smoke, can also trigger an asthmatic reaction.

General aspects of asthma

Asthma is defined as persistent wheezing, often accompanied by wheezing, shortness of breath and cough, especially at night and in the morning. It is the most common chronic disease during the first years of life and is often triggered by an allergy.

Anaphylactic reactions

Symptom

The first mild symptoms may include:

  • urticaria
  • tingling and itching around the mouth
  • inflammation around the eyes and mouth

Serious symptoms may include:

  • itching, especially on the soles of the feet, the palms of the hands or the scalp
  • tingling in the mouth
  • inflammation of the mouth and throat
  • hypotension
  • abdominal pain
  • nausea and vomiting
  • difficulty breathing
  • asthma symptoms
  • deterioration of the general condition

Anaphylaxis is a reaction that affects different organs of the body, independently or jointly. Although the symptoms may be mild at first, there is a risk that they can quickly become a life-threatening disorder, so it is very important to start treatment immediately. The situation is especially urgent when the person loses consciousness.

Common triggers (allergens)

  • peanuts
  • tree nuts, such as hazelnuts, Brazil nuts, walnuts or cashews
  • fish
  • soy
  • shellfish
  • milk
  • eggs
  • seeds
  • fruits
  • drugs
  • poison of bees and wasps

Other foods can also trigger severe reactions, depending on local eating habits.

Generalities of anaphylaxis

The anaphylactic reaction, or anaphylactic shock, is an acute life-threatening allergic reaction. It usually appears quickly, between 5 and 15 minutes, and requires immediate attention.

Food-related anaphylaxis can be triggered when physical exercise is combined with ingestion of a food to which the person is allergic.

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