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What are the symptoms of a severe allergic reaction (anaphylaxis)?
Symptoms of severe allergies are serious, even life-threatening. These symptoms can involve various organ systems – skin, mouth, stomach, respiratory, heart. A severe allergic reaction involving two or more organ systems is called anaphylactic shock or anaphylaxis.
The following signs of a severe allergic reaction and may progress quickly:
Skin: itchy skin, redness, swelling and hives
Mouth: itchy mouth, swelling of lips and tongue
Stomach: vomiting, diarrhea, cramps
Respiratory: shortness of breath, wheezing, coughing, chest tightness or pain
Heart: weak pulse, dizziness, faintness, low blood pressure
Headache, nasal congestion, watery eyes, sweating
Confusion, feeling of impending doom
Loss of consciousness
See More Information on Anaphylaxis
Photo of woman at a computer with icons representing anaphylaxis triggers
Anaphylaxis is a medical emergency. It is a life-threatening reaction. Anaphylaxis must be treated with an epinephrine injection, followed by emergency care.
People with a history of anaphylaxis should always carry two epinephrine auto-injectors with them wherever they go. They should also wear a medical alert bracelet.Overview
Allergies occur when your immune system reacts to a foreign substance — such as pollen, bee venom or pet dander — or a food that doesn't cause a reaction in most people.
Your immune system produces substances known as antibodies. When you have allergies, your immune system makes antibodies that identify a particular allergen as harmful, even though it isn't. When you come into contact with the allergen, your immune system's reaction can inflame your skin, sinuses, airways or digestive system.
The severity of allergies varies doxycycline 100 mg tablet from person to person and can range from minor irritation to anaphylaxis — a where can i buy doxycycline 100mg potentially life-threatening emergency. While most allergies can't be cured, treatments can help relieve your allergy symptoms.
Symptoms
Allergy symptoms, which depend on the substance involved, can affect your airways, sinuses and nasal passages, skin, and digestive system. Allergic reactions can range from mild to severe. In some severe cases, allergies can trigger a life-threatening reaction known as anaphylaxis.