What Is An Allergy?

Theres a lot of talk about allergies. But just what
is an allergy and what causes them? Why do some people
have them while others dont? And why are people with
one allergy more inclined to have many?

The immune system is set up to protect our bodies from
harmful, foreign substances. Like viruses and bacteria
(dirt and germs). Sometimes the immune system doesnt
develop properly or is just oversensitive and doesnt
react right.

In these cases, it reacts to things that arent
harmful and dont usually cause people any problems.
These things are called allergens. The term allergens
is just an easier way to say things that cause
allergies.

When the oversensitive or improperly developed immune
system sees these allergens, it sends out chemicals
like histamine. Its the histamines that cause the
symptoms that are common with allergies.

Symptoms like itching, watery eyes, runny nose,
swelling, hives or rashes. Different people have
different symptoms, but the causes are the same.

The symptoms that are displayed depend on the part of
the body the allergen comes in contact with. Allergens
that are breathed in, like pollen or dust cause
coughing or wheezing, stuffy or runny noses and an
itchy nose and throat.

Plant allergies usually come in contact with the skin,
so they cause rashes.

Food allergies usually result in nausea, vomiting,
stomach pains or in severe cases, life threatening
reactions. Drug allergies tend to involve the entire
body, so they have a variety of symptoms.

This entry was posted on Friday, March 14th, 200

The Most Common Food Allergies

* Milk *

Being allergic to cows milk isnt the same as being
lactose intolerant.

* Eggs *

You can be allergic to either the whites of the yolk.
This type of food allergy is more prevalent in
children, but does affect some adults.

* Peanut *

Most people, adults and children with food allergies,
are allergic to peanuts too.

* Tree nut *

More children have nut allergies than adults. The
symptoms of nut and peanut allergies are the same, but
being allergic to one doesnt necessarily mean youre
allergic to the other.

* Seafood *

This is more common in, but not limited, to children.
The fish allergens can be passed through the air by
people eating or cooking fish near you.

* Shellfish *

Similar to seafood allergies. But having one doesnt
mean being allergic to the other.

* Soy *

People allergic to soy need to be especially careful
when eating Asian foods or using Asian sauces.

* Wheat *

This is most commonly a food allergy, but can also be
a respiratory contact allergy.

In the United States these are referred to as the big
eight. Over 90% of U.S. food allergies consist of
these foods.

Allergens differ in other countries, but these 8 make
the top 10 in many places through out the world.

Food allergies may be based on contact. In East Asia
where rice makes up a large part of the diet, rice
allergies are more common, as are celery allergies in
Central Europe.

Heres A Test To Fail

To diagnose an allergy, the first thing your doctor
does is talk with you. Hell discuss your symptoms,
any medications youre currently taking, and your
personal and family history. A physical examination is
also necessary.

The next step is the tests. There are 3 types of
tests. The skin test, patch test or blood test.

The skin test is the most common test used. Its
generally the most accurate and certainly the least
expensive. With the skin test, a small amount of an
allergen is put on your skin and then the spot is
pricked or scratched with a needle. You can also have
a little bit of the allergen injected into the outer
layer of your skin.

If you have an allergy to the substance that was used,
youll have swelling, redness and itching in the
tested spot within 20 minutes.

The patch test is used to diagnose contact dermatitis.
A small amount of allergen is put on your skin and
covered with a bandage. Your doctor will check the
spot in 48 hours to see if youve developed a rash.

The third type of test is the blood test. This may be
used if you have a skin condition or if youre taking
some type of medication that might interfere with a
skin test.

A blood sample is taken and sent to a laboratory.
There they add allergens to the sample and measure the
amount of antibodies that are produced to attack it.

Asthma Attacks

To healthy individuals, asthma may be a simple health problem but for the sufferers, its really a different thing especially when the attack is slowly setting in.

Asthma attacks happen when the air passages constrict. This may be due to allergens, air impurities, food, exercise or strenuous activities, and many others. Severe attacks are often characterized by wheezing or whistling sounds, dry cough, and breath-shortness. In an asthma attack, the air passage of the individual is clogged by mucus, the air tubes lining is swelling or inflamed. Gasping for breathe is a dreaded situation for asthmatics and so you should try to prevent the attacks as much as possible.

There are several layers in the air tube. A muscle located outside relaxes or tightens and it is responsible for controlling the air tubes opening. It is guided by the nervous system, particularly the portion for the reflexes. The muscle works like that of involuntary blinking.

You cant control how the muscles work. The outside muscle of the air tube reacts to irritants like perfume, dust, allergens, pollution, pollen, or cigarette smoke by tightening or relaxing. In the case of asthma patients, the outside muscle overreacts to the irritants, thereby causing an attack.

Aside from reacting with irritants and allergens, the muscle also reacts to other factors like exercise, cold air, pressure changes, and viral infections. When the muscle tightens, the airway narrows.

Asthma attacks are not only limited to the tightening of the muscles of the air tube but it can be caused by the inflammation of the airways lining as well. Have you ever experienced scraping your knee? If youre observant, you will notice that the knee area swells and a fluid oozes out. This fluid is made up of cells which fight the infection but it also contributes to swelling. The same thing happens in the airways. When the airways are inflamed, the lining oozes out fluid which contributes to swelling and at the same time, it obstructs the air passage.

Mucus found in the airways in not all that bad. It normally aids in the smooth flow of air into the lungs but during an asthma attack, the mucus increases and it clogs the air passage. The mucus becomes sticky making it more difficult to breathe. As long as the mucus clogs the air passage, the asthma attack will persist. You need to consult a doctor right away so that you can receive appropriate medical attention.

Keep in mind that if you leave the mucus clogs untreated, it can lead to infections. Only the doctor can give you the proper antibiotic that suits your situation. Attacks can last for a couple of minutes but for severe attacks, it can last for many hours or even days. There are intervals wherein the asthma patient will not feel any of the symptoms but it will soon return if no proper medication is given.

Doctors often conduct a breathing test to determine if the person has asthma and it is called spitometry. During the evaluation, several tests will be conducted to identify what caused the asthma attack. Once the trigger or triggers are identified, you need to stay away from them as much as possible. You have to work closely with your doctor if you want to prevent future asthma attacks. The attacks can be deadly, so dont disregard them.