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Allergic reactions may last for varying lengths of time. They may take a few hours to a few days to disappear. If the exposure to the allergen continues, such as during a spring pollen season, allergic reactions may last for longer periods such as a few weeks to months.

Allergists recognize four types of allergic reactions: Type I or anaphylactic reactions, type II or cytotoxic reactions, type III or immunocomplex reactions and type IV or cell-mediated reactions.

Sinus congestion can be relieved with both over-the-counter medications and home remedies. Learn about the best medicines for sinus congestion.

An allergy refers to a misguided reaction by our immune system in response to bodily contact with certain foreign substances. When these allergens come in contact with the body, it causes the immune system to develop an allergic reaction in people who are allergic to it. It is estimated that 50 million North Americans are affected by allergic conditions. The parts of the body that are prone to react to allergies include the eyes, nose, lungs, skin, and stomach. Common allergic disorders include hay fever, asthma, allergic eyes, allergic eczema, hives, and allergic shock.

Yes, it is possible to suddenly become allergic to cats, since various allergies can develop at any point in your life, such as a pet allergy.

Common food allergies include milk, eggs, peanuts, tree nuts, sesame, soy, fish, shellfish, and wheat. Here are 20 of the top food allergies.

Before treating a cold, the flu, or allergies with over-the-counter (OTC) medications, it's important to know what's causing the symptoms, which symptoms one wishes to relieve, and the active ingredients in the OTC product. Taking products that only contain the medications needed for relieving your symptoms prevents ingestion of unnecessary medications and reduces the chances of side effects.

Hay fever (allergic rhinitis) is an irritation of the nose caused by pollen and is associated with the following allergic symptoms: nasal congestion, runny nose, sneezing, eye and nose itching, and tearing eyes. Avoidance of known allergens is the recommended treatment, but if this is not possible, antihistamines, decongestants, and nasal sprays may help alleviate symptoms.

Can you develop allergies as an adult? Learn about what causes sudden adult-onset allergies and how you can recognize the symptoms.

The most common food allergies are to eggs, nuts, milk, peanuts, fish, shellfish, strawberries and tomatoes. Symptoms and signs of a food allergy reaction include nausea, vomiting, diarrhea, abdominal pain, itching, hives, eczema, asthma, lightheadedness, and anaphylaxis. Allergy skin tests, RAST, and ELISA tests may be used to diagnose a food allergy. Though dietary avoidance may be sufficient treatment for mild allergies, the use of an Epipen may be necessary for severe food allergies.

Eye allergy (or allergic eye disease) are typically associated with hay fever and atopic dermatitis. Medications and cosmetics may cause eye allergies. Allergic eye conditions include allergic conjunctivitis, conjunctivitis with atopic dermatitis, vernal keratoconjunctivitis, and giant papillary conjunctivitis. Dry eye, tear-duct obstruction, and conjunctivitis due to infection are frequently confused with eye allergies. Eye allergies may be treated with topical antihistamines, decongestants, topical mast-cell stabilizers, topical anti-inflammatory drugs, systemic medications, and allergy shots.

Here are thirteen tips to calm an allergy attack and put an end to constant sneezing, itching, and congestion.

Milk allergy reactions may cause immediate or delayed symptoms. Learn to spot the signs and what foods to avoid if you have a dairy allergy.

The allergic cascade refers to allergic reactions that happen in the body in response to allergens. A variety of immune cells and chemical messengers participate in the allergic cascade. Symptoms of the allergic cascade range from mild swelling and itching to full-blown anaphylactic shock. Allergen avoidance and medications are used to prevent or treat allergies.

Indoor allergens are substances that can cause an allergic reaction in some people. Common sources of indoor allergens include dust mites, cockroaches, molds, pets, and plants. Avoiding indoor allergens is one way to reduce allergy and asthma symptoms.

Since avocado is classified as a fruit and not a tree nut, you should be able to eat avocados even if you have a nut allergy. However, some studies have shown that avocados have similar proteins as chestnuts. So if you’re allergic to chestnuts, you may have to avoid avocados.

Without treatment, allergic conjunctivitis symptoms could last the entire time that your critical allergen is present — which can vary greatly.

Nose and chest congestion are a common occurrence in babies. You can decongest your baby with rest, positioning, hydration, a warm bath, and other home remedies. Most cases of nasal congestion are harmless, but in a few cases where the chest is congested and the baby is not taking feeds, is dull, or has a high fever, it is prudent to seek medical consultation.

According to studies, the twelve most common food allergens include milk, peanuts, eggs, shellfish, soy, tree nuts, wheat, fish, corn, sesame seeds, mustard, and celery. Check out the center below for more medical references on food allergens, including multimedia (slideshows, images, and quizzes), related disease conditions, treatment and diagnosis, medications, and prevention or wellness.

A nut allergy develops when the body's immune system becomes oversensitive to a particular protein in a nut. Nuts that are the worst for allergies include peanuts, walnuts, pecans, almonds, Brazil nuts and pine nuts.

Cinnamon is a popular spice in many dishes. Cinnamon gives dishes a distinct flavor. Only a small percent of people experience allergic reactions after ingesting or coming into contact with cinnamon.

Avoiding allergy triggers at home is one of the best ways to prevent allergy symptoms. Controlling temperature, humidity, and ventilation are a few ways to allergy-proof the home. Cleaning, vacuuming, and using HEPA air filters also helps control allergies.

A food allergy is a condition that causes your immune system to fight against a particular part of food — which is called an allergen. Food allergies can be hereditary — that is, parents can pass the likelihood of developing a food allergy to their children through genes that code for inherited traits.

Both sinus infections and allergies (allergic rhinitis) cause symptoms such as runny or stuffy nose and fatigue. Sinus infection (known as sinusitis) is inflammation of the sinuses, caused by infection from bacteria, viruses, and/or fungi (molds). Allergic rhinitis occurs when certain allergies cause nasal symptoms. When a person with allergies breathes in an allergen, such as pollen, dust, or animal dander, symptoms such as runny or stuffy nose, itching, sneezing, and fatigue occur.

Mosquito bite allergies can cause issues if untreated. Learn the signs of a mosquito bite allergy, what causes it, and what you can do to treat it.

Seasonal allergies are common and tend to ramp up during the spring and summer. Learn about how to get rid of seasonal allergies fast with these 13 home remedies.

The majority of stinging insects in the United States are from bees, yellow jackets, hornets, wasps, and fire ants. The severity of reactions to stings varies greatly. Avoidance and prompt treatment are essential. In selected cases, allergy injection therapy is highly effective.

Latex allergy is a condition where the body reacts to latex, a natural product derived from the rubber tree. The reaction can either be delayed and cause a skin rash or immediate, which can lead to anaphylaxis. Avoiding latex is the most effective way to prevent an allergic reaction.

Learn what medical treatments can ease allergic conjunctivitis symptoms and help speed up your eye allergy recovery.

During certain seasons, allergies can make you miserable. Learn what causes allergy flare-ups during spring and summer.

The most common nut allergies are cashew, walnut, hazelnut and pistachio. In the U.S. the most common nut allergy is cashew, followed by walnut. In the U.K. the most common nut allergy is hazelnut.

Allergies happen when your body's immune system reacts to certain substances as though they are harmful. Allergy symptoms may not go away unless you avoid your triggers, stick to your medications, find the right combination of medications, and consider surgery.

Fall allergies can cause symptoms such as sneezing, congestion, and sinus headache. Learn more about causes, treatment, and prevention of fall allergies.

Congestion can be the only symptom of COVID-19 in some cases.

Drug or medication allergies are caused when the immune system mistakenly creates an immune response to a medication. Symptoms of a drug allergic reaction include hives, rash, itchy skin or eyes, dizziness, nausea, diarrhea, fainting, and anxiety. The most common drugs that people are allergic to include penicillins and penicillin type drugs, sulfa drugs, insulin, and iodine. Treatment may involve antihistamines or corticosteroids. An EpiPen may be used for life-threatening anaphylactic symptoms.

Though there is some overlap in allergy and COVID-19 signs and symptoms there are also significant differences. Symptoms that they have in common include headache, fatigue, tiredness, shortness of breath, wheezing, and sore throat. Fever does not occur with allergies but is one of the defining symptoms of COVID-19 infections.

Since there is no cure for peanut allergies, prevention and keeping an epinephrine injector (EpiPen) on hand is key to helping your child’s allergy.

Oral allergy syndrome, also called pollen food allergy syndrome or PFAS, is a type of food allergy caused by certain allergens found in both pollen and raw vegetables and fruits and some nuts. Foods that cause oral allergy syndrome include those in the birch, grass and ragweed families.

The common symptoms of ragweed allergy are sneezing, runny nose, itchy, watery red eyes, headache, nasal congestion, eye swelling, rashes and coughing.

Allergic conjunctivitis may occur along with sneezing, runny nose, or sinus headache. Many people also find that they are tired and feel agitated.

If you develop symptoms of a food allergy, your doctor will have you undergo a skin test or blood test to determine which foods you are allergic to.