What types of allergies are there? Symptoms, diagnosis, and help

You may be sitting at your desk right now with tissues, scratching your arm, or wondering once again after eating why your stomach is reacting so sensitively. Many people initially notice only individual symptoms. A runny nose here, itchy eyes there, perhaps a rash or an unsettled feeling after eating certain foods.

That is exactly what makes allergies so confusing. They do not look the same in everyone. And it becomes even more complicated because not every reaction to a food or an environmental substance is automatically a true allergy.

Does your nose run constantly? A guide through the allergy maze

Some people immediately think of spring, pollen, and sneezing when they hear about allergies. Others only consider the possibility much later because their symptoms look more like a skin problem, a gastrointestinal issue, or recurring fatigue. The body often sends signals that do not seem connected at first glance.

You may know the feeling. You wake up in the morning with a blocked nose even though you do not have a cold. Your eyes itch while you are out walking. After eating at a restaurant, your stomach reacts. And when you wear new jewelry, your skin turns red. It quickly starts to feel as though your own body is suddenly reacting “to everything.”

You are not alone in having this impression. An estimated 20 to 30 million people in Germany suffer from allergies, which corresponds to around 25 percent of the population. At 15 percent of adults, hay fever is the most common form (Statista on allergies in Germany).

Why allergies are so often underestimated

Many people affected get used to their symptoms. They then say things like: “I’ve always had sensitive skin” or “I’m just run-down in spring.” The problem is simple. If you merely put up with symptoms, you often recognize patterns far too late.

Allergic reactions can look very different:

• In the airways, sneezing, coughing, and a runny or blocked nose may occur.
• In the eyes, itching, watering, or redness may appear.
• On the skin, hives, eczema, or a burning sensation may develop.
• In the digestive system, bloating, stomach pain, or nausea may occur.

If you notice recurring symptoms, that does not mean you are “making a fuss.” It is a good reason to take a closer look.

The first helpful thought

Not every symptom immediately indicates a serious illness. But recurring reactions usually have a trigger. Understanding that exact trigger brings clarity to the whole topic.

The question “what allergies are there” is therefore more than mere curiosity. It helps you categorize symptoms, recognize typical patterns, and choose the next sensible step.

The broad world of allergies – An overview of the most common types

Allergies can seem chaotic. A clear classification makes them much easier to understand. For everyday purposes, it is most useful to think in terms of triggers. In other words, not starting with technical terms, but with the question: What is my body reacting to?

The most common groups in everyday life

Pollen allergies are the best-known form. Typical symptoms include sneezing, watery eyes, and an irritated nose, especially outdoors or when windows are open. Many people simply call this hay fever.

Food allergies occur when the immune system reacts to certain proteins in food. People often think of nuts, milk, or eggs. Symptoms may begin in the mouth but can also affect the skin, gastrointestinal tract, or breathing.

House dust mite allergies often stand out because symptoms are worse mainly at home, at night, or in the morning. Many people initially suspect dry air from heating or a lingering cold.

Animal dander allergies are technically often reactions to proteins from animals’ skin flakes, saliva, or urine. This is why a reaction can occur even when there is little visible hair.

Contact allergies appear on the skin. Common triggers include metals such as nickel, as well as fragrances, cosmetics, or certain ingredients in everyday products.

Insect venom allergies involve reactions after stings, such as those from bees or wasps. It is especially important to take symptoms after a sting seriously and have them medically assessed.

Overview of the most common allergy categories

Type of allergy	Common triggers	Typical symptoms
pollen allergy	grasses, trees, herbs	sneezing, runny nose, itchy eyes
food allergy	nuts, milk, eggs, other food proteins	tingling in the mouth, skin reactions, gastrointestinal symptoms
house dust mite allergy	dust mite particles in household dust	blocked nose, urge to sneeze, symptoms at night or in the morning
Pet allergy	Proteins from skin flakes, saliva, urine	Eye irritation, sneezing, coughing
Contact allergy	Nickel, fragrances, cosmetic ingredients	Redness, itching, eczema at contact sites
Insect venom allergy	Bee or wasp stings	strong local reaction, general allergic symptoms

Where readers often get confused

It becomes confusing when several allergies occur at the same time. This is not unusual. For example, someone may react to pollen and also be sensitive to certain foods because their protein structures are similar. If this affects you, take a look at the topic of cross-allergies.

An important principle is that the trigger is not always where the symptom appears. A reaction in the mouth may be related to pollen. A skin rash may be caused by a metal.

So what allergies are there specifically?

The short answer is: There are allergies to substances you inhale, eat, touch, or get into your body through a sting. The longer answer is more helpful. Your symptoms often already point in a particular direction. That is why it is worth considering the trigger and the situation together.

What happens in the body? The mechanisms behind the reaction

An allergy does not simply mean being “sensitive.” The body assesses a substance that is actually harmless as a threat and starts an immune response. This explains why symptoms often appear so suddenly and intensely.

Type I reacts quickly

The type I allergy is the form that many people think of first. It affects around 20 to 30 percent of the population in Germany and is mediated by IgE antibodies, which lead to the release of histamine within minutes, causing itching and swelling (DocCheck on allergies).

You can think of IgE antibodies as overly nervous guards. They are ready and raise the alarm as soon as they recognize a specific substance. Histamine is then released, among other substances. This messenger substance is directly responsible for many typical symptoms, such as itching, swelling, sneezing, or watery eyes.

Typical examples include:

• Hay fever with a rapid reaction after contact with pollen
• Many food allergies with symptoms shortly after eating
• Some animal hair allergies with a direct reaction upon contact

Type IV takes time

The type IV allergy works quite differently. It is not primarily determined by IgE, but by immune cells that react with a delay. As a result, symptoms often do not appear until hours later or even later still.

This is typical of contact allergies. For example, you wear jewelry or use a product on your skin. Redness, itching, small blisters, or eczema develop later rather than immediately.

Why this knowledge is practically important

If you understand whether your reaction occurs immediately or is delayed, you can narrow down the triggers more effectively. This is also why different testing methods answer different questions.

A blood test for specific IgE antibodies can provide indications of immediate-type reactions. For skin reactions after contact, other diagnostic methods are often relevant. But another point is even more important: Not every symptom after eating is a genuine allergy. The difference between an allergy and an intolerance explains this clearly and practically.

A reaction that occurs soon after contact is more likely to be an immediate reaction. Skin symptoms that appear much later are more consistent with a delayed reaction.

Interpreting symptoms correctly, from a runny nose to a skin rash

Many people categorize their symptoms by organ. The nose is an ENT issue, the skin is a dermatological issue, and the stomach is a nutrition issue. With allergies, these are often connected.

Airways and eyes

If you frequently need to sneeze, have a runny nose, or constantly feel congested, this often points to a reaction to substances in the air. This is especially true when the symptoms become worse in certain places or at certain times.

The eyes also provide important clues. Itching, watery eyes, and redness together with the urge to sneeze form a typical pattern. If you consider only individual symptoms, you may quickly assume dry air or irritation. The combination is what makes the difference.

Skin as a warning surface

The skin often shows allergic reactions very directly. It may itch, feel tight, burn, or react with redness. Sometimes hives develop; at other times, the skin is more likely to become dry and inflamed.

The practical question is: Where does the reaction occur? A reaction directly at a contact site is more likely to indicate an external trigger such as jewelry, personal care products, or other substances. If you want to better interpret typical skin symptoms, the overview of allergic rash can help.

Mouth, abdomen, and digestion

Things become particularly confusing after eating. Tingling in the mouth, itching in the throat, or an unpleasant feeling of warmth may be consistent with an allergic reaction. Abdominal pain, a feeling of fullness, or bloating alone, on the other hand, are less conclusive.

This is the point at which many people hastily speak of an “allergy.” In fact, digestive symptoms may also have another cause. That is precisely why the pattern is crucial.

• More suggestive of an allergy are rapid reactions after contact or consumption, especially with itching, swelling, or skin involvement.
• Rather nonspecific are digestive symptoms alone without a typical immune reaction.
• Especially important is recording recurring combinations, such as food plus skin plus nose.

The more precisely you observe the timing, location, and triggers, the easier it will be to interpret them later.

Tracing the cause: how doctors and tests provide clarity

The most important first step in diagnosis is often not the test but the conversation. Doctors look at when symptoms occur, how quickly they begin, whether there are typical triggers, and which patterns recur.

Traditional approaches to diagnosis

Different methods may be considered depending on what is suspected. Commonly used methods include:

• Medical history. This records the history of your symptoms and is often crucial for determining the right direction.
• Skin tests. These can help with certain questions, especially when an immediate-type reaction is suspected.
• Blood tests. These can be used to look for specific IgE antibodies.
• Contact-related tests. Different procedures are used for skin reactions after contact than for typical hay fever.

What matters here is taking a clear-eyed approach. A single test can never replace interpreting the symptoms. You may be sensitized to a substance without actually experiencing symptoms in everyday life.

The common confusion in everyday life

Many people say, “I’m allergic to milk” or “Tomatoes don’t agree with me because of an allergy.” That may be true. But often, it is not.

A crucial gap in diagnosis is the confusion between allergies and intolerances. While only 1 to 2 percent of the population have true IgE-mediated food allergies, an estimated 20 million Germans suffer from intolerances that have other causes (DAAB on the most common allergies and how they differ from intolerances).

This is extremely important in everyday life. An allergy is a reaction of the immune system. An intolerance, by contrast, often occurs because the body does not process a substance well. This is still burdensome for those affected, but biologically it is something different.

Why classic allergy tests sometimes do not provide an answer

If your symptoms mainly affect your abdomen but typical allergy tests do not provide a clear explanation, that does not automatically mean that “nothing is wrong.” It may mean that a different question needs to be asked.

Questions such as these are more appropriate:

Question	More indicative of
Do itching, swelling, or rapid reactions occur?	true allergy
Are digestive symptoms the main concern?	possible intolerance
Do skin problems develop after direct contact?	Contact allergy

This is exactly where many people begin wanting a more structured assessment that looks beyond classic allergies.

Clarity from home: when a blood test makes sense for you

Not every unclear reaction requires an immediate, lengthy diagnostic process involving multiple appointments. Especially when symptoms recur but are difficult to pin down, a home test can be a useful first step.

When this can be especially helpful

A blood test at home is particularly suitable if you suspect patterns but cannot clearly identify them. For example, if you react to pollen and also do not tolerate certain foods well. Or if you want to distinguish between an allergy and an intolerance without simply guessing.

Demand for home tests increased by 35 percent over the past 12 months because they help uncover hidden reactions. For example, 70 percent of people with pollen allergies suffer from cross-allergies to foods, which often go undetected and can be identified through such tests (AOK on allergy types and cross-reactions).

What a home test can do

A home test does not replace emergency medical care or medical treatment for severe reactions. But it can significantly structure the search for triggers.

One example is the mybody x blood test. Depending on your specific concerns, an AllergyCheck for IgE-mediated reactions, a broader combination check, or tests for intolerances and nutrients may be suitable. Its practical benefit lies mainly in no longer viewing symptoms in isolation, but instead deliberately looking for patterns. If you want to know what the process looks like in practice, you can find it under Do an allergy test yourself.

Who this is a good next step for

• For unexplained symptoms after eating foods that cannot be clearly classified
• If cross-reactions are suspected, when pollen and food seem to be connected
• For recurring symptoms that you finally want to investigate systematically

A good test does not answer every medical question. But it can make the right question visible. That is often what brings the decisive progress.

Your options after diagnosis

Once you know what your body reacts to, many things become easier. Not always more pleasant, but easier. A vague problem becomes a specific task.

What you can do next

The first and most effective step is almost always avoiding the trigger. In the case of contact allergies, this often means switching products or materials. With food allergies, the focus is on clear avoidance. For pollen or house dust issues, adjustments in everyday life can help.

Then there is symptom relief. Depending on the symptoms, medications recommended by a doctor can help you manage acute reactions more effectively. This is particularly important when the nose, eyes, or skin are severely affected.

The third option is hyposensitization. It may be suitable for certain allergies and aims to make the immune system react less severely over the long term. Whether it is appropriate depends on your trigger and your personal situation.

What you can take away from this

• Take symptoms seriously instead of explaining them away
• Note triggers and observe patterns
• Distinguish between allergies and intolerances
• Choose diagnostics that match the question

Clarity is often the biggest turning point. When you understand what is happening in your body, you make calmer and better decisions.

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If you want to assess your symptoms on a sound basis, you can take a look at the mybody x blood test. Depending on your specific concerns, it gives you the option of having allergies, intolerances, and, where relevant, nutrient or hormone levels assessed more systematically from home.