
Blue cheese is a delicious treat, but it can also be a source of discomfort for those who are allergic to it. The two main allergens in blue cheese are milk and mold. If you have a known milk allergy, it is best to avoid all dairy products, including blue cheese, as even a small amount can cause an allergic reaction. Similarly, if you have a mold allergy, it is recommended to stay away from dried fruit, aged cheeses, and beer. An allergic reaction to blue cheese can range from mild symptoms such as digestive issues, skin rashes, and nausea, to more severe symptoms such as anaphylaxis, which can be life-threatening. If you think you may have accidentally consumed blue cheese and are experiencing any unusual symptoms, it is important to seek medical attention immediately.
What to do if I ate blue cheese and am allergic
| Characteristics | Values |
|---|---|
| Symptoms | Sneezing, digestive issues, nausea, vomiting, skin rashes, wheezing, shortness of breath, coughing, chest tightness, swelling, hives, rash, itching, dizziness, increased heart rate, sudden drop in blood pressure, and more |
| Action | If you suspect an allergic reaction, take an antihistamine like Benadryl. If symptoms are severe, seek emergency medical attention. |
| Prevention | If you have a known allergy to mold or milk, avoid blue cheese. Check with a doctor if you are unsure about mold allergies. |
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What You'll Learn

Symptoms of an allergic reaction to blue cheese
Blue cheese contains two highly allergenic substances: milk and mold. If you are allergic to either of these, you may experience an allergic reaction after eating blue cheese. Symptoms of an allergic reaction to blue cheese can vary from person to person and can range from mild to severe.
Mild symptoms of an allergic reaction to blue cheese may include digestive issues such as nausea, vomiting, and diarrhea. Some people may also experience skin-related symptoms, such as hives, rashes, or swelling. These mild symptoms can often be treated with over-the-counter antihistamines or steroids prescribed by a doctor.
More severe symptoms of an allergic reaction to blue cheese can include difficulty breathing, dizziness, an increased heart rate, and a sudden drop in blood pressure. This type of reaction is known as anaphylaxis and requires immediate medical attention. If you experience any of these symptoms after consuming blue cheese, seek emergency medical help right away.
It is important to note that even if you do not have a known allergy to penicillin medication, you may still react to the Penicillium mold present in blue cheese. The mold in blue cheese is added to give it its distinctive blue, blue-gray, or blue-green veins or spots. If you have a known mold allergy or are concerned about a possible allergy, it is best to avoid blue cheese and consult your doctor or allergist for testing and advice.
Additionally, if you experience any unusual or persistent symptoms after consuming blue cheese, such as inflammation or digestive issues, it is recommended to make an appointment with your doctor to determine the cause and rule out any potential allergies.
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The link between a penicillin allergy and a blue cheese allergy
Some people are allergic to penicillin medication, and it is estimated that up to 27 million people in North America alone are allergic, with around 5,440 cases of fatal anaphylaxis per year. However, it is important to note that not everyone who thinks they are allergic to penicillin actually is. In fact, according to BBC Science Focus, only 20% of people who believe they are allergic truly are.
The mold used to make penicillin medication is Penicillium chrysogenum, while the strain commonly found in most blue cheeses is Penicillium roqueforti. Blue cheese uses the whole mold, whereas antibiotics use an extract. However, there is still a risk of an allergic reaction as some blue cheeses also use the chrysogenum strain.
It is possible to be allergic to both penicillin and blue cheese. Some people with a penicillin allergy have reported allergic reactions to blue cheese, including rashes, swelling, and other symptoms consistent with anaphylaxis. Therefore, if you are allergic to penicillin, it is recommended to proceed with caution when consuming blue cheese. You can ask your allergist to test you for a reaction to penicillium mold to determine if it is safe for you to consume blue cheese.
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What to do if you experience an allergic reaction
If you experience an allergic reaction after consuming blue cheese, there are several steps you should take to address the situation. Firstly, it is important to identify the signs and symptoms of an allergic reaction, which can vary from person to person. Common symptoms of a blue cheese allergy may include digestive issues, skin rashes, nausea, vomiting, diarrhea, wheezing, shortness of breath, coughing, chest tightness, or inflammation in different parts of the body.
If you experience any of these symptoms, it is crucial to act promptly. Mild to moderate symptoms can often be managed with over-the-counter antihistamines, which can help alleviate symptoms by blocking the effects of histamine, a chemical released during an allergic reaction. Additionally, keeping an antihistamine medication, such as Benadryl, on hand can be useful in case of unexpected reactions.
For more severe reactions, immediate medical attention may be required. If you experience symptoms such as swelling of the mouth or face, difficulty breathing, dizziness, increased heart rate, or a sudden drop in blood pressure, seek emergency medical care. An extreme allergic reaction, known as anaphylaxis, can be life-threatening and requires immediate treatment.
To prevent future allergic reactions, it is advisable to avoid consuming blue cheese and any other foods that may trigger your allergy. Blue cheese contains both milk and mold, which are common allergens. If you suspect an allergy to either of these substances, consult a doctor or allergist to discuss testing and determine the specific allergens to avoid. They may recommend allergy testing to confirm the presence of an allergy and provide guidance on managing your condition.
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How to identify a blue cheese allergy
Blue cheese contains two highly allergenic substances: milk and mould. If you are allergic to either of these, you may experience an allergic reaction after consuming blue cheese.
Milk is one of the most common food allergies in both children and adults. If you have a known milk allergy, it is important to avoid all dairy products, including blue cheese, as even a small amount of milk can cause an allergic reaction. Symptoms of a milk allergy can include diarrhoea, nausea, vomiting, skin rashes, wheezing, shortness of breath, coughing, and chest tightness. These symptoms typically appear within minutes of ingesting blue cheese.
Mould allergies are also common, and the mould in blue cheese can trigger an allergic reaction in people with this allergy. Mould allergies often arise from inhaling airborne spores during the spring, summer, and fall months, causing inflammation in the eyes, throat, and sinuses. However, ingesting mould can also lead to inflammation in the gastrointestinal system and the skin. If you have a mould allergy, it is recommended to avoid dried fruit, aged cheeses, and beer.
If you suspect you may have a blue cheese allergy, pay attention to any symptoms you experience after consuming blue cheese. These may include digestive issues such as nausea and diarrhoea, respiratory symptoms such as wheezing and coughing, or skin reactions such as rashes or inflammation. If you experience any of these symptoms, make an appointment with your doctor, who may recommend allergy testing to confirm the presence of a blue cheese allergy.
It is important to note that the symptoms and severity of a blue cheese allergy can vary from person to person, and some people may experience a more severe reaction, such as anaphylaxis. If you are experiencing severe symptoms, seek immediate medical attention.
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What to eat if you're allergic to blue cheese
If you are allergic to blue cheese, it is likely that you are allergic to one or more of its ingredients, such as milk or mold. If you suspect that you are allergic to blue cheese, you should consult a doctor, who can run tests to determine what you are allergic to and advise you on what to avoid.
If you are allergic to mold, you do not necessarily have to avoid all moldy cheeses. The mold in blue cheese is a type called Penicillium roqueforti, which some people are allergic to. Other types of moldy cheese, such as Brie, use a different type of mold, Penicillium candidum, which you may be able to tolerate. Fresh cheeses such as mozzarella and ricotta are made without mold spores, so these are also likely to be safe options.
If you are allergic to milk, you may be able to tolerate small amounts of lactose, so some low-lactose cheeses may be suitable. Hard goat cheese, for example, may be a good alternative.
If you are unsure about what types of cheese you can eat, it is best to consult a doctor or a dietician.
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Frequently asked questions
Symptoms of an allergic reaction to blue cheese can include digestive issues, rashes, swelling, nausea, vomiting, skin rashes, wheezing, shortness of breath, coughing, chest tightness, and in extreme cases, anaphylaxis.
Blue cheese contains two highly allergenic substances: milk and mold. Most symptoms caused by an allergic reaction are the result of inflammation in soft tissue in different parts of the body.
If you are experiencing an allergic reaction, seek medical attention immediately. If you have an epinephrine auto-injector (EpiPen), use it as soon as you notice symptoms.
If you suspect that you may be allergic to blue cheese, consult with your doctor. They may recommend allergy testing to determine the specific allergen causing the reaction.

























