What allergies are there? Symptoms, diagnosis, help

You might be sitting at your desk with tissues, scratching your arm, or repeatedly wondering why your stomach reacts so sensitively after eating. Many people initially only notice individual symptoms. A runny nose here, itchy eyes there, perhaps a rash or a queasy feeling after certain foods.

That's what makes allergies so confusing. They don't manifest the same way in everyone. And it gets even more complicated because not every reaction to food or an environmental substance is automatically a true allergy.

Is your nose constantly running? A guide through the allergy jungle

Some people immediately associate allergies with spring, pollen, and sneezing. Others only consider it much later because their symptoms look more like a skin problem, a gastrointestinal issue, or recurring fatigue. The body often sends signals that don't seem to fit together at first glance.

Maybe you know the feeling. You wake up in the morning with a stuffy nose, even though you don't have a cold. Your eyes itch when you go for a walk. Your stomach reacts after a restaurant visit. And your skin turns red with new jewelry. Quickly, you get the feeling that your own body is suddenly reacting "to everything."

You're not alone in that impression. In Germany, an estimated 20 to 30 million people suffer from allergies, which corresponds to about 25 percent of the population. Hay fever is the most common form among adults, affecting 15 percent (Statista on allergies in Germany).

Why allergies are often underestimated

Many sufferers get used to their symptoms. They then say things like: "I just always have sensitive skin" or "I'm just run down in the spring." The problem with this is simple. Those who simply accept symptoms often recognize patterns much too late.

Allergic reactions can look very different:

• In the respiratory tract, sneezing, coughing, a runny or stuffy nose occur.
• In the eyes, itching, tearing, or redness appear.
• On the skin, hives, eczema, or burning can develop.
• In the digestive system, bloating, abdominal pain, or nausea can manifest.

If you observe recurring symptoms, it's not a sign that you're "making a fuss." It's a valid reason to take a closer look.

The first helpful thought

Not every complaint immediately means a serious illness. But recurring reactions usually have a trigger. Understanding this trigger is precisely what brings calm to the whole issue.

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

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

Allergies seem chaotic. With a clear classification, they become much more manageable. For everyday life, it's most useful to think in terms of triggers. So, not primarily about technical terms, but about the question: What does my body react 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 with an open window. Many 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. The symptoms can start in the mouth, but also affect the skin, gastrointestinal tract, or breathing.

House dust mite allergies often become noticeable because symptoms are stronger mainly at home, at night, or in the morning. Many then first suspect dry heating air or a persistent cold.

Pet dander allergies are, strictly speaking, often reactions to proteins from dander, saliva, or urine of animals. Therefore, the reaction can occur even if there is hardly any visible hair.

Contact allergies manifest on the skin. Common triggers include metals like nickel, but also fragrances, cosmetics, or certain ingredients in everyday products.

Insect venom allergies involve reactions after stings, for example from bees or wasps. Here it is particularly important to take symptoms after a sting seriously and have them evaluated by a doctor.

Overview of the most common allergy categories

Where readers often get confused

It gets confusing when several allergies occur simultaneously. This is not uncommon. For example, someone can react to pollen and additionally be sensitive to certain foods because the protein structures are similar. If this affects you, take a look at the topic of cross-allergies.

An important principle is: The trigger is not always where the symptom appears. A reaction in the mouth can be related to pollen. A skin rash can come from 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 long answer is more helpful. Your symptom profile often already indicates a direction. Therefore, it's worth always considering triggers and situations together.

What happens in the body? The mechanisms behind the reaction

An allergy doesn't just mean "being sensitive." The body evaluates a harmless substance as a danger and initiates a defense reaction. This explains why symptoms often appear so suddenly and intensely.

Type I reacts quickly

Type I allergy is the form many think of first. It affects about 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 imagine IgE antibodies as over-nervous sentries. They are ready and raise the alarm as soon as they recognize a specific substance. Then, among other things, histamine is released. This messenger substance is partly responsible for many typical symptoms such as itching, swelling, sneezing, or watery eyes.

Typical examples are:

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

Type IV takes time

The Type IV allergy is quite different. It is not primarily determined by IgE, but by immune cells that react with a delay. Therefore, symptoms often only appear hours or even later.

This is typical for contact allergies. For example, you wear jewelry or use a product on your skin. Not immediately, but later, redness, itching, small blisters, or eczema develop.

Why this knowledge is practically important

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

A blood test for specific IgE antibodies can provide clues to immediate-type reactions. For skin reactions after contact, other diagnostic approaches are often relevant. Even more important, however, is another point: Not every complaint after eating is a true allergy. The difference between allergy and intolerance explains this well and practically.

A quick reaction after contact tends to indicate an immediate reaction. Skin complaints appearing significantly later are more consistent with a delayed reaction.

Correctly interpreting symptoms from a runny nose to a skin rash

Many people categorize their complaints by organ. The nose is an ENT issue, the skin is a skin issue, the stomach is a dietary issue. With allergies, these are often interconnected.

Respiratory tract and eyes

If you often sneeze, your nose runs, or constantly feels stuffy, this often corresponds to a reaction to airborne substances. This is especially true if the symptoms worsen in certain places or at certain times.

The eyes also provide important clues. Itching, tearing, and redness combined with sneezing are a typical pattern. Those who only look at individual symptoms quickly think of dry air or irritation. The interplay makes the difference.

Skin as a warning surface

The skin often shows allergic reactions very directly. It can itch, feel tight, burn, or react with redness. Sometimes hives appear, sometimes rather dry, inflamed areas.

Practically, the question is: Where does the reaction occur? Directly at a contact point rather suggests an external trigger such as jewelry, care products, or other substances. If you want to better classify typical skin signs, the overview on allergic rash helps.

Mouth, stomach, and digestion

After eating, things get particularly unclear. A tingling in the mouth, itching in the throat, or an unpleasant warm sensation can indicate an allergic reaction. Abdominal pain, bloating, or flatulence alone, however, are less clear.

This is where many people prematurely talk about "allergy." In fact, digestive problems can also have other causes. That's precisely why the pattern is crucial.

• More likely allergic are rapid reactions after contact or consumption, especially with itching, swelling, or skin involvement.
• More non-specific are isolated digestive complaints without a typical immune reaction.
• Particularly important is to note recurring combinations, such as food plus skin plus nose.

The more precisely you observe the timing, location, and triggers, the easier the subsequent classification will be.

Tracking down the cause – How doctors and tests provide clarity

The most important first step in diagnostics is often not the test, but the conversation. Doctors examine when symptoms appear, how quickly they start, whether there are typical triggers, and what patterns repeat.

Classic ways to clarify

Depending on the suspicion, different methods may be considered. Frequently used are:

• Anamnesis. It collects the history of your symptoms and is often crucial for the right direction.
• Skin tests. They can help with certain questions, especially if an immediate type is suspected.
• Blood tests. These can search for specific IgE antibodies.
• Contact-related tests. For skin reactions after contact, different procedures are used than for typical hay fever.

A sober look is important. A test alone never replaces the classification of symptoms. One can be sensitized to a substance without actually experiencing symptoms in everyday life.

The great confusion in everyday life

Many people say, "I'm allergic to milk" or "I'm allergically intolerant to tomatoes." That might be true. But often it's not.

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

This is extremely important for everyday life. An allergy is an immune system reaction. An intolerance, on the other hand, often arises because the body doesn't process a substance well. While it still feels burdensome for those affected, it's biologically different.

Why classic allergy tests sometimes don't provide an answer

If your symptoms primarily affect your stomach, but you don't find a clear explanation in typical allergy tests, it doesn't automatically mean that "nothing is wrong." It might mean that the question needs to be framed differently.

Then, questions like these are more useful:

Precisely at this point, many people desire a more structured clarification that doesn't just focus on classic allergies.

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

Not every unclear reaction immediately requires a lengthy diagnostic process with multiple appointments. Especially when symptoms recur but are difficult to pinpoint, a home test can be a useful first step.

When this can be particularly helpful

A home blood test is particularly suitable if you suspect patterns but cannot make a clear assignment. For example, if you react to pollen and additionally don't tolerate certain foods well. Or if you want to distinguish between allergy and intolerance without just guessing.

The demand for home tests has increased by 35 percent in the last 12 months, as they help to uncover hidden reactions. For example, 70 percent of pollen allergy sufferers have cross-allergies to foods, which often go undetected and can be identified by such tests (AOK on allergy types and cross-reactions).

What a home test can achieve

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

An example is the mybody x blood test. Depending on the specific question, an AllergyCheck for IgE-mediated reactions, a broader combi-check, or tests for intolerances and nutrients may be suitable. The practical benefit lies primarily in no longer viewing symptoms as unsorted but rather in systematically searching for patterns. If you want to know what such a process looks like in detail, you can find it under DIY Allergy Test.

Who this is a good next step for

• For unclear symptoms after consuming food that cannot be clearly classified
• For suspected cross-reactions, when pollen and food are noticed together
• For recurring symptoms that you finally want to systematically investigate

A good test doesn't answer every medical question. But it can make the right question visible. That's often what brings crucial progress.

Your options for action after diagnosis

Once you know what your body reacts to, many things become simpler. Not always pleasant, but simpler. A diffuse problem turns into a concrete task.

What you can do then

The first lever is almost always avoiding the trigger. For contact allergies, this often means changing products or materials. For food allergies, it's about clear avoidance. For pollen or dust mite issues, everyday adjustments can help.

Then comes symptom relief. Depending on the symptoms, medically recommended medications can help to better manage acute reactions. This is particularly important if the nose, eyes, or skin are severely affected.

The third option is hyposensitization. This is an option for certain allergies and aims to make the immune system react less severely in the long term. Whether this is suitable depends on your trigger and your personal situation.

What you can take away specifically

• Take symptoms seriously instead of explaining them away
• Note triggers and observe patterns
• Separate allergy and intolerance
• Choose diagnostics appropriate to the question

Clarity is often the biggest turning point. Those who understand what is happening in their own body make calmer and better decisions.

If you want to classify your symptoms on a sound basis, you can check out the mybody x blood test. It offers you the opportunity to clarify allergies, intolerances, and, depending on the question, also nutrient or hormone levels from home in a more structured way.