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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.

Chronic rhinitis (non-allergic rhinitis) causes runny nose, sneezing, nasal itching, and congestion. Post-nasal drip is the drainage of mucus from the sinuses into the throat. Treatment includes over-the-counter (OTC) medications.

Mucus is a standard substance produced by lining tissues in the body. Excess mucus or yellow, green, brown, or bloody mucus may indicate a problem. Mucus production may increase when allergies, a cold, flu, cough, or sore throat occur. Antihistamines and cold and flu medications may help alleviate excess mucus. A neti pot may be used to decrease nasal congestion and clear mucus.

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 infection (sinusitis) is caused by allergies, infection, and chemicals or other irritants of sinuses. Signs and symptoms include headache, fever, and facial tenderness, pressure, or pain. Treatments of sinus infections are generally with antibiotics and at times, home remedies.

Learn how to stop coughing attacks without medicine at night and at other times naturally. Learn about 19 tips to stop nighttime and persistent cough. Causes of excessive coughing include prescription medications, allergies, cigarette smoke, heart disease, and infections. Home remedies include natural herbs and supplements like ginger, honey, turmeric, and mint.

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.

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.

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

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.

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

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.

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.

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.

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.

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.

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.