Q What are signs of allergies?
Allergy is the hypersensitivity disorder of body immunity. Allergic reactions occur when a persons immune system reacts to normally harmless substances in the environment. And the substance cause allergy is allergen. Mild allergies are hay fever, skin rash, fever, asthma, itching, running nose, sneezing. Severe life threatening allergy is called anaphylaxis. The organs of the body are not getting enough blood because of dangerously low blood pressure. Shock may lead rapidly to death. The person in shock may be pale or red, sweaty or dry, confused, anxious, or unconscious. Breathing may be difficult or noisy, or the person may be unable to breathe. Shock is caused by sudden dilation of many or large blood vessels. This is brought on by the action of the mediators. If the drop in blood pressure is sudden and drastic, it can lead to unconsciousness, even cardiac arrest and death. Following are the local signs of allergy:nSkin: redness, irritation, itching, swelling, blistering, weeping, crusting, rash, eruptions, or hives (itchy bumps or welts). Lungs: wheezing, tightness, cough, or shortness of breathnHead: swelling of the face, eyelids, lips, tongue, or throat, hoarseness of voice.nNose: stuffy nose, runny nose (clear, thin discharge), sneezingnEyes: red (bloodshot), itchy, swollen, or waterynStomach: pain, nausea, vomiting, diarrhea, or bloody diarrhea