However, differences between national layouts are mostly due to different selections and placements of symbols on the character keys. The core section of a keyboard consists of character keys, which can be used to type letters and other characters. Typically, there are three rows of keys for typing letters and punctuation, an upper row for typing digits and special symbols, and the Space bar on the bottom row. The positioning of the character keys is similar to the keyboard of a typewriter. MIT "space-cadet" keyboard, a pre- ISO/IEC 9995 keyboard with a large number of modifier keys. It was equipped with four keys for bucky bits ( Control, Meta, Hyper, and Super) and three shift keys, called " shift", "top", and "front".īesides the character keys, a keyboard incorporates special keys that do nothing by themselves but modify the functions of other keys. 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.
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Cough, chest tightness, wheezing or shortness of breathĪtopic dermatitis, an allergic skin condition also called eczema, can cause skin to.Ī large area of swelling (edema) at the sting site.Swelling of the lips, tongue, face or throat.Watery, red or swollen eyes (conjunctivitis).Itching of the nose, eyes or roof of the mouth.Hay fever, also called allergic rhinitis, can cause: In some severe cases, allergies can trigger a life-threatening reaction known as anaphylaxis.Some types of allergies, including allergies to foods and insect stings, can trigger a severe reaction known as anaphylaxis. Signs and symptoms of anaphylaxis include:Ī life-threatening medical emergency, anaphylaxis can cause you to go into shock. You might see your health care provider if you have symptoms you think are caused by an allergy, and nonprescription allergy medications don't provide enough relief.
If you have symptoms after starting a new medication, call the provider who prescribed it right away.įor a severe allergic reaction (anaphylaxis), call 911 or your local emergency number or seek emergency medical help.
If you carry an epinephrine auto-injector (Auvi-Q, EpiPen, others), give yourself a shot right away.Įven if your symptoms improve after an epinephrine injection, you should go to the emergency department to make sure symptoms don't return when the effects of the injection wear off. If you've had a severe allergy attack or any signs and symptoms of anaphylaxis in the past, make an appointment to see your health care provider.
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