Need Help? Phone us on: 020 3411 5405   
9am to 8pm - 7 days a week

Allergy Symptoms

Allergy Symptoms can manifest themselves in a vast range of symptoms, such as sneezing, coughing or a runny nose. When you have an allergic reaction, the immune system overreacts to exposure to an allergen such as house dust mite, diesel pollution, pet dander or pollen. Allergy symptoms may be mild, or severe to the extent where they can be life-threatening.

FAQ about Allergy Symptoms:

How do allergy symptoms happen?
What are the main allergy symptoms?
What are the symptoms of rhinitis?
What are the symptoms of eye allergy?
What are the symptoms of eczema?
What are the symptoms of urticaria?
Are allergy symptoms medically serious?
How can I prevent allergy symptoms from occurring?

How do allergy symptoms happen?

top of page ^

Allergy is a condition in which the immune system responds to a substance that is, in itself, harmless. The immune system is programmed to give a physiological response to any substance entering the body (or produced within it) which it considers to be ‘foreign’. When these substances are harmful, like bacteria, toxins, viruses and cancer cells, then the immune response does a good job of protecting the body. However, when it produces an allergic response to an otherwise harmless substance, like pollen and house dust mite, the allergic person experiences various symptoms. The presence of the allergen causes the immune system to produce molecules known as Immunoglobulin E (IgE) and these, in turn, react with immune cells called mast cells, causing them to produce a chemical called histamine. It is histamine which acts on cells, producing allergy symptoms like sneezing and itching. So allergic reactions occur after you have come into contact with an allergen, however, exposure to allergens produces no immune response in a person who is not allergic.

Why allergic symptoms occur is not completely understood, but allergies do tend to run in families and there is likely a strong genetic component. A person who has a predisposition to allergic disease is said to be atopic and it is this condition of atopy which is inherited, rather than a specific allergy.

Inhalation, ingestion or skin contact can produce allergic symptoms. In the UK, the most common inhaled allergens (in order) are:

1. House dust mite
2. Grass pollen
3. Cat Dander
4. Tree pollen

Common food allergens include:

  • Shellfish
  • Peanuts
  • Tree nuts
  • Strawberries
  • Cow's milk
  • Eggs

Other common triggers for allergy symptoms are:

  • Mould spores
  • Bee and wasp venoms
  • Latex
  • Chemicals

Allergy symptoms can also be caused by the use of certain drugs.

What are the main allergy symptoms?

top of page ^

The most common allergic symptoms include:

  • Sneezing
  • Coughing
  • Skin rash
  • Blocked nose
  • Itching
  • Watery eyes

These symptoms may have non-allergic causes, however, the doctor and patient should look for patterns in the symptoms which may suggest allergy – that is, a clear connection between exposure to a potential allergen and the appearance of symptoms. If necessary, skin prick tests or blood tests can be carried out to confirm the diagnosis of allergic disease.

Allergic symptoms can also be examined in terms of the underlying allergic condition. Rhinitis symptoms, for instance, are very different from the symptoms of asthma. However, the underlying immune response is broadly the same in all allergic conditions:

Coughing, Wheezing and difficulty breathing are key traits of asthma. To learn more about the symptoms of asthma please visit our asthma symptoms page.

Itchy eyes, coughing, sneezing, runny nose, and nasal blockage are some of the main symptoms of rhinitis. To learn more about the symptoms of rhinitis please visit our Rhinitis page.

Redness, discharge, and itching are all symptoms of eye allergy. To learn more about the symptoms of eye allergy please visit our Sore Eyes page.

Itchy skin, rashes, redness and weals on the skin are some of the symptoms of Urticaria (nettle rash).

Itchy skin is also a key hallmark of eczema. To learn more about the symptoms of eczema please visit our Eczema page.

What are the symptoms of urticaria?

top of page ^

Urticaria, which is also known as nettle rash (the word 'urtica' is Latin for stinging nettle), is a skin condition which may have an allergic origin (though the majority of cases are not allergic). Allergens causing urticaria include:

  • Bee and wasp stings
  • Foods like shellfish, fruit, nuts and dairy products
  • Some drugs 

Urticaria appears as an itchy rash consisting of small weals on the skin, having the appearance of multiple insect bites. Sometimes the weals are larger and raised, appearing red at the edge and white in the middle. The rash does not leave any scars but the skin may feel slightly numb following an attack.

Are allergy symptoms medically serious?

top of page ^

Allergy symptoms may pose no more than an occasional nuisance. However, people with severe allergies such as asthma do need to manage their condition carefully because an asthma attack is potentially fatal. Another allergic condition that can be very serious is anaphylaxis, which is a severe allergic reaction involving the whole body. Signs and symptoms of anaphylaxis include:

1. Raised blood pressure
2. Swelling of the tissues (angioedema)
3. Asthma attack
4. Upset stomach

The onset of these allergy symptoms is usually rapid and may escalate into a life-threatening condition known as anaphylactic shock, which must be promptly treated by an adrenaline injection. This can be self-administered. For example, people with severe peanut allergies tend to carry one with them as they know they are prone to anaphylactic shock.

How can I prevent allergy symptoms from occurring?

top of page ^

The first step in preventing allergy symptoms is to know your allergen! However, an air purifier fitted with a HEPA filter will help remove all particulate contaminants including allergens, such as house dust mite allergen and pollen, from the air inside your home or place of work.

House dust mite: Try mite-proof mattress covers and wash bedding regularly at a high temperature. Vacuum regularly with a vacuum that is fitted with a High-Efficiency Particulate Air (HEPA) filter, damp dust and get rid of dust-accumulating clutter. Consider replacing carpet, which is a reservoir for house dust mite, with wooden flooring.

Mould spores: Ventilate the home well. At the very least open windows after bathing or showering and after cooking to get rid of steam. Tackle damp patches with a bleach solution.

Pollen: Be alert to daily pollen counts. Change your clothes, shower and wash your hair when coming in from outdoors. Wear wraparound sunglasses to stop pollen grains coming into contact with your eyes.

Pet dander: Unfortunately, often the most effective way to control allergy symptoms caused by pet dander, is to find a new home for the pet. Obviously, that is not always possible, as many pets are considered part of the family. The use of allergy-friendly cleaning products (such as PET+ Pet Shampoo), a HEPA equipped cat & dog vacuum cleaner and the right air purifier will go a long way in limiting your day to day exposure to allergens and thus control your allergy symptoms.

Allergy Symptoms - Information and FAQs | Allergy Cosmos Articles

Benadryl for allergy symptoms Pharmacies mostly recommend Benadryl for allergy symptoms. It is the trade name for a range of products containing either acrivastine or cetirizine - which are antihistamine drugs used to treat allergy symptoms such as: runny nose, sore eyes, rashes and sneezing.
Read More
hardwood floors to improve allergy symptoms However good your choice and carpet care is, in reality it is very hard to keep allergen levels in a carpet down and you will be living with a constant source of trigger for your condition (especially if the carpet is in the bedroom). So why not follow the advice of the Asthma and Allergy Foundation of America – if you have a severe allergy, replace your carpet with hard flooring?
Read More
ways to reduce your allergy symptoms Allergens like house dust mite droppings, pet dander and mould spores lurk in dust and dirt, so be sure to target them in your annual spring cleaning project. Try this 11 point check list to improve your asthma and allergy symptoms this hay fever season.

Declutter. Ornaments, old newspapers, unused or broken appliances, unwanted furniture – they all collect dust. Do a little at a time, go through each room, and aim to get surfaces clear so they can be dusted quickly and easily. If an object isn't useful, beautiful or of real sentimental value, get rid of it.

Read More
foods that make allergy symptoms worse In line with our recent post about Dr. Andrew Weil and hay-fever, there is a lot of discussion about foods that make allergy symptoms worse and the effects that certain diets can have on your allergy symptoms.
Read More