46 doctors weighed in:
What is the worst thing that could happen due to an allergic reaction?
46 doctors weighed in

Dr. Alan Greene
Pediatrics
12 doctors agree
In brief: Anaphylaxis
The most severe reaction that can occur after repeated exposure to something you are allergic to is called anaphylaxis.
This rare but sudden condition causes itchy welts (hives), followed by wheezing, shortness of breath, and occasionally, swelling of the tongue or throat. Without treatment, swelling of the tongue or throat can sometimes worsen and block the airway.

In brief: Anaphylaxis
The most severe reaction that can occur after repeated exposure to something you are allergic to is called anaphylaxis.
This rare but sudden condition causes itchy welts (hives), followed by wheezing, shortness of breath, and occasionally, swelling of the tongue or throat. Without treatment, swelling of the tongue or throat can sometimes worsen and block the airway.
Dr. Alan Greene
Dr. Alan Greene
Thank
1 comment
Dr. Joel Selter
While anaphylaxis is the most common immediate life threatening hypersensitivity reaction- oftentime to foods, one should be alert to some of the very severe reactions associated with drug hypersensitivity- such as Stevens Johnson, Toxic Epidermal Necrolyis (TEN) as well as DRESS.
Dr. Andrew Murphy
Internal Medicine - Allergy & Immunology
8 doctors agree
In brief: Death
The worst thing that happen from an allergic reaction is death.
This most serious allergic reaction is called anaphylaxis and can occur after exposure to certain foods, bees sting reaction, medication reactions or other unusual causes.

In brief: Death
The worst thing that happen from an allergic reaction is death.
This most serious allergic reaction is called anaphylaxis and can occur after exposure to certain foods, bees sting reaction, medication reactions or other unusual causes.
Dr. Andrew Murphy
Dr. Andrew Murphy
Thank
Dr. Maziar Rezvani
Internal Medicine - Allergy & Immunology
5 doctors agree
In brief: Death
Which is usually secondary to hypotension or asphyxiation.
Less commonly hypoxemia from severe bronchospasm can also occur.

In brief: Death
Which is usually secondary to hypotension or asphyxiation.
Less commonly hypoxemia from severe bronchospasm can also occur.
Dr. Maziar Rezvani
Dr. Maziar Rezvani
Thank
Dr. Kevin Windisch
Pediatrics
4 doctors agree
In brief: Death
Your lips, tongue and airways (large and small) could all swell shut.
At the same time your blood pressure could drop, this is called anaphylaxis.

In brief: Death
Your lips, tongue and airways (large and small) could all swell shut.
At the same time your blood pressure could drop, this is called anaphylaxis.
Dr. Kevin Windisch
Dr. Kevin Windisch
Thank
1 comment
Dr. Alan Khadavi
Then you could die too.
Dr. Bhavin Patel
Internal Medicine - Allergy & Immunology
3 doctors agree
In brief: DEATH
Symptoms from an allergic reaction can range from an annoying symptoms such as itch or irritation to death.

In brief: DEATH
Symptoms from an allergic reaction can range from an annoying symptoms such as itch or irritation to death.
Dr. Bhavin Patel
Dr. Bhavin Patel
Thank
Dr. Arthur Torre
Pediatrics - Allergy & Asthma
3 doctors agree
In brief: Anaphylaxis
The worse allergic reaction which typically occurs to severe food allergy is anaphylaxis is defined as "a serious allergic reaction that is rapid in onset and may cause death".
Symptoms may include hives or swollen lips, difficulty breathing and reduced blood pressure leading to shock.

In brief: Anaphylaxis
The worse allergic reaction which typically occurs to severe food allergy is anaphylaxis is defined as "a serious allergic reaction that is rapid in onset and may cause death".
Symptoms may include hives or swollen lips, difficulty breathing and reduced blood pressure leading to shock.
Dr. Arthur Torre
Dr. Arthur Torre
Thank
Dr. Robert Kwok
Pediatrics
2 doctors agree
In brief: Unfortunately, death
In rare cases, allergic reactions can be fatal.
This may happen if the tongue and/or throat swell up and block off one's breathing. Death may also occur if the allergic reaction drops the blood pressure too low for too long, destroys the majority of one's blood cells or platelets, or severely damages the skin all over the body (mimicking a large burn).

In brief: Unfortunately, death
In rare cases, allergic reactions can be fatal.
This may happen if the tongue and/or throat swell up and block off one's breathing. Death may also occur if the allergic reaction drops the blood pressure too low for too long, destroys the majority of one's blood cells or platelets, or severely damages the skin all over the body (mimicking a large burn).
Dr. Robert Kwok
Dr. Robert Kwok
Thank
Dr. Pamela Lindor
Pediatrics
2 doctors agree
In brief: Anaphylaxis
A true, severe allergic reaction can be life threatening.
An allergen can trigger what is called an anaphylactic reaction, causing rash, wheezing, low blood pressure and other serious symptoms. Most "allergies" however, are much less severe. If you have concerns about possible allergies in your child, ask your pediatrician.

In brief: Anaphylaxis
A true, severe allergic reaction can be life threatening.
An allergen can trigger what is called an anaphylactic reaction, causing rash, wheezing, low blood pressure and other serious symptoms. Most "allergies" however, are much less severe. If you have concerns about possible allergies in your child, ask your pediatrician.
Dr. Pamela Lindor
Dr. Pamela Lindor
Thank
Dr. Alan Khadavi
Internal Medicine - Allergy & Immunology
1 doctor agrees
In brief: You die.
Hypotension, shock, or closing of the throat.

In brief: You die.
Hypotension, shock, or closing of the throat.
Dr. Alan Khadavi
Dr. Alan Khadavi
Thank
1 doctor agrees
In brief: Anaphylaxis
Anaphylaxis is very dangerous, because the airway can swell up and close off.
Anyone with a history of a severe food allergy (mouth or lip swelling) should have two epinephine ("epi") pens with him/her at all times. There are also blood tests that can help predict which foods or exposures could trigger a severe allergic reaction.

In brief: Anaphylaxis
Anaphylaxis is very dangerous, because the airway can swell up and close off.
Anyone with a history of a severe food allergy (mouth or lip swelling) should have two epinephine ("epi") pens with him/her at all times. There are also blood tests that can help predict which foods or exposures could trigger a severe allergic reaction.
Dr. Victoria Acharya
Dr. Victoria Acharya
Thank
Dr. Jeffrey Min
Pediatrics
1 doctor agrees
In brief: Anaphylaxis/death
In severe cases of allergic reactions, a person can develop anaphylaxis which can include tightening of the airways/throat to cause problems breathing and sometimes even stop breathing.
It can also lead to a drop in blood pressure/shock which can lead to death.

In brief: Anaphylaxis/death
In severe cases of allergic reactions, a person can develop anaphylaxis which can include tightening of the airways/throat to cause problems breathing and sometimes even stop breathing.
It can also lead to a drop in blood pressure/shock which can lead to death.
Dr. Jeffrey Min
Dr. Jeffrey Min
Thank
Dr. Jay Park
Pediatrics
1 doctor agrees
In brief: Shock and death
The most severe allergic reaction, so called anaphylaxis, involve shortness of breath/wheezing, hypotension, urticarial rash (hives), and swelling of vocal cords.
Anaphylactic reaction can be deadly if an appropriate treatment is not rendered in time. Peanut and bee venom allergy are good examples.

In brief: Shock and death
The most severe allergic reaction, so called anaphylaxis, involve shortness of breath/wheezing, hypotension, urticarial rash (hives), and swelling of vocal cords.
Anaphylactic reaction can be deadly if an appropriate treatment is not rendered in time. Peanut and bee venom allergy are good examples.
Dr. Jay Park
Dr. Jay Park
Thank
Dr. Paul Trani
Pediatrics
1 doctor agrees
In brief: Anaphylaxis
Anaphylaxis is the most severe type of allergic reaction.
It results in swelling of areas within the mouth, throat, and upper airways, which can cause severe difficulty in breathing. Anaphylaxis can also have GI complications as well. Doctors give Epinephrine to families where anaphylaxis is a risk. These are commonly called 'epi-pens'.

In brief: Anaphylaxis
Anaphylaxis is the most severe type of allergic reaction.
It results in swelling of areas within the mouth, throat, and upper airways, which can cause severe difficulty in breathing. Anaphylaxis can also have GI complications as well. Doctors give Epinephrine to families where anaphylaxis is a risk. These are commonly called 'epi-pens'.
Dr. Paul Trani
Dr. Paul Trani
Thank
Dr. Gregg Alexander
Pediatrics
1 doctor agrees
In brief: Unable to breath
A full blown allergic reaction (anaphylaxis) could lead to swelling of the throat and a closed air passage.
Breathing is pretty much the most important thing we do, so having the ability to move air in and out is essential!

In brief: Unable to breath
A full blown allergic reaction (anaphylaxis) could lead to swelling of the throat and a closed air passage.
Breathing is pretty much the most important thing we do, so having the ability to move air in and out is essential!
Dr. Gregg Alexander
Dr. Gregg Alexander
Thank
Dr. Pedro Hernandez
Internal Medicine - Geriatrics
In brief: Death
People with serious allergies must carry with them Epinephrine injectable (epipen)for just in case of emergency.

In brief: Death
People with serious allergies must carry with them Epinephrine injectable (epipen)for just in case of emergency.
Dr. Pedro Hernandez
Dr. Pedro Hernandez
Thank
Dr. Jason Campbell
Family Medicine
In brief: Anaphylaxis
The absolute worst thing that could happen with an allergic reaction would be anaphylaxis resulting in respiratory compromise such as a swollen throat or tongue obstructing the airway and can possibly result in death.

In brief: Anaphylaxis
The absolute worst thing that could happen with an allergic reaction would be anaphylaxis resulting in respiratory compromise such as a swollen throat or tongue obstructing the airway and can possibly result in death.
Dr. Jason Campbell
Dr. Jason Campbell
Thank
Dr. Timothy King
Surgery - Plastics
In brief: You could die
In severe allergic reactions you develop anaphylaxis which causes a massive histamine release, your throat swells closed and you blood pressure can drop.
Without immediate intervention, you cannot breath and die.

In brief: You could die
In severe allergic reactions you develop anaphylaxis which causes a massive histamine release, your throat swells closed and you blood pressure can drop.
Without immediate intervention, you cannot breath and die.
Dr. Timothy King
Dr. Timothy King
Thank
Dr. Kevin Windisch
Pediatrics
In brief: Anaphylaxis
The worst thing that could happen is that your airway could swell shut, you could stop breathing and your heart stop.
This is why people with severe allergies need to carry an Epinephrine pen with them at all times.

In brief: Anaphylaxis
The worst thing that could happen is that your airway could swell shut, you could stop breathing and your heart stop.
This is why people with severe allergies need to carry an Epinephrine pen with them at all times.
Dr. Kevin Windisch
Dr. Kevin Windisch
Thank
Get help from a real doctor now
Dr. Christopher Crosby
Board Certified, Dermatology
12 years in practice
93K people helped
Continue
107,000 doctors available
Read more answers from doctors