Tomato and OAS????

Posted on: Mon, 08/06/2007 - 1:37pm
anonymous's picture
Joined: 05/28/2009 - 16:42


I have been reading many of the old links regarding oral allergy syndrome on here. Some of you seem like hoping to get an opinion or two.

DS is 3 years old. His 6 year old sister is PA (found out with ana reaction). DS RAST tested positive to peanuts and tree nuts. Avoiding.

The past few weeks his face, arms, legs, etc...have been splotchy. We have a garden, and tomato is one thing he has been getting out and eating alot of. A few nights ago he ate quite a bit of tomato on a fajita. A few hours later was screaming in pain as he had diarreah. He also had hives on his bottom where it came out.

He is constantly scratching at his face, arms, etc.... but he does that alot anyway due to eczema.

He was skin tested for tomato quite awhile ago and tested negative.

This really sounds like OAS to me, but could it turn anaphylactic, especially if he has tested negative to tomato?

Is this different then other posts when people eating red sauce get red splotches on their face? Anybody get them on other body parts?

Any thoughts?? thanks in advance!!

Posted on: Mon, 08/06/2007 - 2:26pm
SFMom's picture
Joined: 11/27/2006 - 09:00

Thank you so much for posting about OAS. I had never heard of it, so I looked it up online and found a terrific Wikipedia entry:
This explains why fresh cherries make my mouth itch and my lips swell up. And why I get a similar (but smaller) reaction to certain melons. Yet, I can eat those fruits cooked and they give me no trouble. I'm allergic to ragweed and other pollens. So this explains it.
Regarding the tomato you are asking about, in the Wikipedia entry, I see this in the category of being allergic to grass pollen.
Grass pollen:
I know that my allergist has said that a person can become allergic to a food, pollen, or environmental factor at any time. A woman who works in my dentist's office suddenly became allergic to tomatoes in her 50s after a lifetime of eating tomatoes.
I wonder if allergy shots make you less allergic to a food if you have an OAS reaction? I have been getting allergy shots for pollen/grasses/dust mites etc for almost 10 years. Makes me wonder if I'm now less sensitized to fresh cherries and melons.
(I don't have peanut kids do. I just have regular hay fever type allergies).

Posted on: Tue, 08/07/2007 - 2:02am
happycat's picture
Joined: 08/31/2004 - 09:00

Hi Emily'smommy -
My son has OAS (reacts to apples, carrots, some pitted fruits). His reactions are always immediate and centered around the mouth - ie immediate tongue itching and sometimes a few hives around his lips. He has never any sort of delayed reaction though, or anything like hives on any other part of his body.
Can he eat tomatoes when they are cooked? Usually if the offending fruit or vegetable is cooked/processed, a person with OAS will not have a reaction to it.
The digestive issues don't sound like OAS to me though.

Posted on: Tue, 08/07/2007 - 2:06am
momll70's picture
Joined: 09/26/2006 - 09:00

I think OAS usually happens in the mouth only. I could be wrong but I think hives in other places is more of a severe reaction. Is he allergic to latex? I knew someone with a latex allergy and couldn't eat tomatoes or oregano. My DH gets OAS when he eats cherries and plums. His mouth and toungue itch for about 15 min. and then it is over.

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