Allergies

In some people, the body's immune system responds incorrectly to normally harmless substances, such as pollen or dust and reacts as if they are harmful.

Substances that cause this undesired response are called allergens, so this response mechanism is known as an allergic response.
During an allergic reaction, the body produces a chemical called histamine that makes small blood vessels widen in the skin, eyes, and nose. This is why allergy symptoms commonly include itchy, watery nose and eyes as well as asthma-like symptoms such as wheezing and coughing.

If one or both of your parents have allergies, your risk is higher. Also, if you have a large family, your risk of having allergies is related to your birth order. Younger siblings have a lower incidence of allergies than their older brothers and sisters.

Allergic Reactions.mp3

Many people don't realize it but allergies actually develop over time.

Allergies are the body's incorrect response to substances that it perceives as a threat. The first exposure to an allergen causes the body to begin developing antibodies as a way of protecting the body from harm. Future exposure causes an effect called sensitization where the production of antibodies increases. Eventually the allergen begins to act as a trigger that causes the allergic response.

People inherit a tendency to be allergic, although not to any specific allergen. If a child develops an allergy, it is very likely that at least one of his or her parents has allergies. Being exposed to allergens at certain times when the body's defenses are low or weak, such as after a viral infection or during pregnancy, also may contribute to the development of allergies.

Developing Allergies.mp3

Around 90% of the population has some form of allergy to poison ivy, making it one of the most common allergens in the US.

The itchy rash associated with poison ivy is actually caused by an oily substance called urushiol that is found in the leaves, stem and roots of the vine.
A poison ivy rash will usually begin to appear 1 to 2 days after coming in contact with urushiol. The affected area will become red and swollen then blisters will begin to form, and the rash will become very itchy. The blisters may burst and ooze a clear or pale yellow liquid. This liquid is not urushiol and contact with it will not cause the rash to spread. If the rash covers large areas of the body or spreads to the face or genitals, a doctor should be consulted.

Poison Ivy.mp3

Urushiol is the name of the contact poison found in poison ivy.

It's a clear or light brown oil and the only way to get the itchy rash associated with poison ivy is to get urushiol on the skin This oil can remain potent for months or even years on any surface, including garden implements, clothing and even dead plants.

Those with a severe allergy will begin to react within hours of contact, but for most people, it takes 2-3 days or even longer for first-time sufferers. The oil can be removed from the skin using copious amounts of water or rubbing alcohol, but soap or detergents should be avoided because these can bind to the oil and actually cause it to spread. If the itchy rash begins to occur, it may be treated with an over-the counter steroidal cream, although more severe reactions require medical attention.

Poison Ivy Treatment.mp3

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