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Health Forum    Allergies
Health Discussion Forum

 Am I allergic to soy?
Everytime I drink soy my throat gets reeeeeaaaaaallllllllyyyyy itchy.

 is it tru that?
is it tru that all the peopl that live in the scenter of the earth can never com up bc they r alergic 2 the sun???...

 if you weren't allergic to latex gloves in the beginning is it possible to be allergic to them trough time
like last week no this week ...

 Is their a test that you can take to find out what foods your allergic to?

 How do people who are allergic to milk get calcium?

 I've been suffering with my allergies for a long while now...?
maybe I have a sinus infection my head has been killing me and I don't want to eat anything, nose stuffed all the time until I take nasal spray can I just see my family doctor for diagnosis? or ...

 DO all people get allergic reactions to poison ivy?

 when seasons change, i get sick?
The weather is starting to warm up. And whenever the seasons start changing, I get sick. I cough, have a sore throat, sinus drainage. I think it might be allergies. But today I started getting an ...

 How can I wear a nice watch if I'm allergic to metal?
Whenever I've ever gotten a watch in my life it's always been the cheap one with a leather strap and the metal buckle. Then I would put fingernail polish on it which would rub off in a ...

 i'm allergic to the cold, does anyone have any ideas on how to beat this thing, other than moving to Florida?

Additional Details
I get red spots on my skin, then hives, like you would from a mosquitoe bite.. eating cold food, lately, also seems to ...

 Can you have food alergies to organic and naturall foods?
I have been feeding my daughter more organic and natural foods. She has been breaking out alot latley and I don't know if that is the reason. I took her to the doctor and I have to put her on C...

 Professionals, please - two questions about allergies!?
1) Without going to the doctor, how can I tell if I'm getting a cold, or developing allergies?

My nose is continuously running, I keep sneezing, and my throat hurts from the random ...

 Why does the mosqitoe tends to target me more?
This sounds like a stupid topic, but I'm still concerned. You know how some people gets attracted by mosquitoes more than others , I want to know why. Some people say its the acidic level in my ...

 perfume allergy symptom?
I just bought some new perfume from Victoria's Secret, and it seems that every time that i put it on, i soon after start to get a stomachache followed by (sorry) diarrhea. Does anyone ...

 gluten allergy?
I have an allergy to gluten, diagnosed by my specialist. Recently though i have eaten bread and biscuits and no ill effects, can anyone explain? Is it safe to do so? I find it hard eating gluten ...

 How can I make my throught not sound scratchy by tomorrow?
I have a major talent show tomorrow and my throught feels terrible! This talent show is so important to me, and I am up agenst a super talented girl named Mikki Hankins. She is on YouTube, just ...

 Can my sinus problems be cured?
i have really bad nasal allergies. Every morning i wake up and blow my nose for about 10 minutes, then drain with a netti-pot. most days i have a lot of pressure in my sinuses. It seems like when ...

 why am i allergic to all types of metal? (piercing)?
the first time i got my ear pierced, i used 14k gold earrings. Then i switched to silver and had an allergic reaction. I got it repierced with the same gold afterwards, and then had an allergic ...

 How to get rid of a stuffy nose in 1 day!?

 any of you ever had an allergy test done?
whats it like? what do they do? does it hurt?...

bee bee
what are histamines, or what do anti histamines do ?

Are you ready for this?
Histamine is released as a neurotransmitter. The cell bodies of neurons which release histamine are found in the posterior hypothalamus, in various tuberomammillary nuclei. From here, these histaminergic neurons project throughout the brain, to the cortex through the medial forebrain bundle. Histaminergic action is known to modulate sleep. Classically, antihistamines (H1 histamine receptor antagonists) produce sleep. Likewise, destruction of histamine releasing neurons, or inhibition of histamine synthesis leads to an inability to maintain vigilance. Finally, H3 receptor antagonists (which stimulate histamine release) increase wakefulness.High or low histamine levels are considered by some of the alternative medicine community to be health issues; this is not accepted by the mainstream medical community. However, as an integral part of the immune system it may be involved in immune system disorders and allergies..
Anti-histamines are the medicines you take to STOP you from having allergies... eg.
Hayfever tablets

Histamines are a chemical your body releases in response to bacteria or allergens entering your body. You know that itchy, burning sensations you get right before you sneeze? That's caused by histamines.

Dr Frank
There are at least 3 types of histamine receptors in the body, though their effect and the effects of so called specific histamine receptor blockers, antihistamines, do overlap. Two types of histamine receptor, the H1 and H2-receptors are found not only on vascular smooth muscle cells but on the perivascular autonomic nerve terminals.

Type 1 is associated mostly with allergy and blocked by what most of us know as antihistamines, such as Piriton etc.

Type 2 histamine blockers, such as cimetidine block acid release into the stomach.

Histamine was shown to inhibit its own release from depolarized slices of rat cerebral cortex. This phenomenon was found to be mediated by a novel class of histamine receptor, the H3-receptor, that was pharmacologically distinct from the H1- and H2-receptors.

Histamine is a hormone which is involved in many processes within cells. However, when people have allergic reactions, too much histamine is produced, causing irritation, swelling etc. Anti-histamines reduce the amount of histamine in the body, so the swelling reduces and symptoms improve.

Histamine is a natural chemical produced by the body in response to foreign organisms. Although it's an important part of the body's defence mechanism, the body sometimes releases too much histamine and this produces the allergic reaction. (For example, in hay fever, too much histamine is released in response to pollen and the histamine receptors in the nose are overstimulated, which irritates the nose and eyes, causing sneezing, an itchy, runny nose and red, itchy eyes). Antihistamines work by blocking the action of histamine at special sites (receptors) in the skin, nose, blood vessels and airways, and are available in injections, oral preparations (tablets, capsules and syrups), eye drops, nasal sprays and drops, and creams and lotions. Those intending to use antihistamines should be aware that they can cause drowsiness, and this affects the ability to perform tasks such as driving and operating machinery.

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