Allergies Symptoms

When asked to define allergy symptoms, most people think of sneezing, sniffling and itchy eyes – the trademark features of “hay fever”. In fact, many other types of allergy symptoms can affect the skin, lungs, eyes and other areas of the body.

Allergy symptoms appear wherever the body releases histamine in response to an allergen. Most often, histamine is released in the skin, respiratory system or stomach. Depending on histamine levels, symptoms may range from a mild skin rash to life-threatening anaphylaxis.

Allergic Rhinitis

A young girl with allergic rhinitis symptoms.Most people know allergic rhinitis as hay fever – a cluster of allergic reactions occurring around the mouth, nose and face. Coughing, sneezing, a runny nose and wheezing are all common symptoms of allergic rhinitis.

The causes of allergic rhinitis vary: Pollen from trees and plants, dust mites, and animal dander are all common triggers. Allergy symptoms vary from person to person, and include a mix of the following:

  • coughing or sneezing
  • wheezing
  • sinus headaches
  • itchy eyes, mouth, ears, nose and/or throat
  • runny nose
  • sore throat.

Chronic Sinusitis and Sinus Headaches

In addition to common hay fever reactions, airborne allergens can cause sinusitis. The sinus membranes become inflamed, leading to nasal congestion, sinus headaches, coughing and nasal discharge. Most cases of sinusitis last a few weeks, but chronic cases can last for months.

Asthma Symptoms

Asthma is characterized by inflammation of the respiratory airways, leading to shortness of breath, wheezing, cough and a feeling of tightness in the chest. Many triggers can set off an asthma attack, including airborne allergens.

Allergic Conjunctivitis

Allergic conjunctivitis is an allergic reaction of the eye. Over eighty million Americans suffer from ocular allergies. The eye usually becomes inflamed after contact with an airborne allergen. Symptoms include itchy eyes, redness, tearing and discharge from the eye.

Allergic conjunctivitis does not damage the eye, but certain forms of conjunctivitis can cause vision loss, and may be mistaken for allergic conjunctivitis. Atopic keratoconjunctivitis can cause photosensitivity (aversion to light), corneal ulcers and cataracts, if left untreated. Vernal conjunctivitis causes intense itchiness in the eye, blurry vision, a “stringy” discharge from the eye and photosensitivity. If you experience any of these symptoms, seek medical attention.

Skin Rashes and Urticaria


Skin contact with an allergen may cause a skin rash or skin hives. A skin rash may appear as blotchy red patches or small red spots. The rash is generally confined to the area of contact with the allergen.

Skin hives (urticaria) are raised, itchy red bumps caused by the release of histamine in the body. They can be chronic, and may swell. Urticaria is not usually dangerous, but the sudden development of widespread hives is a sign of anaphylaxis and should be taken seriously. If swelling develops in the airways or on the tongue, breathing can become difficult: Seek immediate medical attention if this occurs.


Eczema is a specific skin condition with possible genetic links to allergies. People who suffer from eczema often have a family history of allergies or asthma. A scaly red rash that itches and blisters characterizes eczema. Over time, constant itching can lead to red, leathery skin.

Gastrointestinal Symptoms

Histamine can be released into the digestive system. If this happens, nausea or stomach cramps may result. Vomiting and diarrhea are also possible. Allergic reactions of the digestive system can be easily mistaken for “the flu” or food poisoning.


Anaphylaxis is the most dangerous of the allergic reactions. Prompt medical attention is required to prevent loss of consciousness or even death. Once an allergen is encountered, anaphylaxis can occur immediately, or begin up to an hour after initial contact. Symptoms of anaphylaxis can include:

  • itching and tingling of the mouth or lips
  • dizziness or lightheadedness
  • a hoarse voice
  • swollen lips
  • shortness of breath or wheezing
  • widespread urticaria
  • a sudden drop in blood pressure
  • a loss of consciousness.