Allergies are caused by an overactive immune system which reacts to a normally harmless substance, such as pollen, by producing antibodies. The symptoms of an allergic reaction vary depending on the type of allergen involved, but generally include sneezing, congestion, itchy eyes, a runny nose, and a scratchy throat. In some cases, allergies can cause a rash, hives, or difficulty breathing. Allergic reactions may also be accompanied by abdominal pain, nausea, vomiting, and diarrhea.
The most common symptoms of an allergic reaction of the upper respiratory system include sneezing, itching, stuffy and/or runny nose, and itchy eyes. These reactions can be caused by inhaling pollen, dust, pet dander, mold, or other allergens. In some cases, a person may experience a sudden itching or tingling sensation in the nose, mouth, or throat, which is often accompanied by swelling of the lips, tongue, and throat.
Allergic reactions of the lower respiratory system, such as asthma, can cause shortness of breath, chest tightness, wheezing, and coughing. People with asthma may also experience a feeling of tightness in the chest, which may be accompanied by difficulty breathing.
In severe cases, allergic reactions can cause anaphylaxis. Symptoms of anaphylaxis include sudden swelling of the throat, tongue, and lips, difficulty breathing, hives, and dizziness. Anaphylaxis is a life-threatening reaction and requires immediate medical attention.
Allergies can vary in severity from person to person. In some cases, the symptoms may be mild and manageable with over-the-counter medications. In other cases, the symptoms may be more severe and require prescription medications or even injections of epinephrine. If you are experiencing any symptoms of an allergic reaction, it is important to consult your doctor for a proper diagnosis and treatment plan.