Health encyclopaedia - Alphabetical Topic List健康百科全书-按字母顺序排列的主题清单
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Nettle rash荨麻疹
Nettle rash (also known as hives or urticaria) is characterised by a lumpy, itchy rash with red spots.荨麻疹（也称为荨麻疹或荨麻疹）的特点是由一个结节，发痒的皮疹与红点。 It is the rash you get when you have been stung by nettles.这是出疹的病征，你当你已丁由荨麻。 However, it can also be caused by a reaction to certain foods and occasionally, by a viral infection.不过，它也可能引起的反应，某些食物，有时是由病毒感染。
If the rash lasts less than six weeks it is called acute urticaria.如果出疹的病征，历时不到六个星期，这是所谓的急性荨麻疹。 Acute urticaria usually clears up within 24 hours.急性荨麻疹通常是清除了24小时。 Very occasionally, a persistent form called chronic urticaria, develops which lasts for several months or even years and the rash keeps coming and going on most days for more than six weeks.很偶然，持之以恒，形成所谓的慢性荨麻疹，发展持续数月甚至数年及出疹的病征，不断来来去去，大部分天为6个星期以上。
Acute urticaria is common.急性荨麻疹是常见的。 Approximately 20% of people will have at least one attack of urticaria in their lifetime.大约20 ％的人都将有至少一名攻击性荨麻疹在其一生中。 Chronic urticaria is much less common; approximately 1 in 1000 people develops chronic urticaria in their lifetime.慢性荨麻疹是常见的少得多;约有1人在1000年的发展慢性荨麻疹在其一生中。
Sometimes, urticaria occurs at the same time as the more serious condition called angioedema.有时候，荨麻疹发生在同一时间，作为更严重的条件下所谓的血管性水肿。 Angioedema involves swelling in the deeper layers of the skin.血管性水肿涉及肿胀，在深层皮肤。 The swelling causes a burning sensation and often occurs on the neck and face, the fingers and toes, and, in men, the genitals.膨胀造成的烧灼感，而且往往发生在颈部及面部，手指和脚趾，并在男子的生殖器。
The lining or the mouth and windpipe may swell and breathing may become difficult.衬砌或口和气管，可能膨胀和呼吸可能会变得困难。 Angioedema occurs in approximately half of people with chronic urticaria, it also occurs without urticaria and with acute urticaria.血管性水肿发生在大约一半的人，慢性荨麻疹，也没有出现荨麻疹和急性荨麻疹。 Angioedema commonly lasts 1-2 days and occurs from time to time.血管性水肿常见的持续1-2天，并从发生的时间，以时间。 Occasionally the tongue or throat swells, this is rarely life-threatening unless it is associated with a serious food allergy.偶尔舌头或咽喉膨胀，这是很少有生命危险的，除非它是有联系的一个严重的食物过敏。
Acute urticaria is also one of the symptoms of a serious allergic reaction affecting the whole body.急性荨麻疹之一，也是症状严重的过敏反应，影响全身。 This is called anaphylaxis and can happen within minutes to hours of exposure to the substance that the person is allergic to.这就是所谓的过敏性反应和可能发生几分钟内，以小时暴露的实质该人是过敏。 Other symptoms of anaphylaxis include shock, swelling all over the body, wheezing and abdominal cramps.其他症状包括过敏休克，肿胀，所有超过身体，喘鸣及腹部绞痛。 Anaphalaxis can be life threatening so should be treated as a medical emergency. anaphalaxis可危及生命，所以应被视作一个紧急医疗。
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Incidence rates for acute urticaria are similar for men and women; chronic urticaria occurs more frequently in women.发病率为急性荨麻疹是类似的男性和女性;慢性荨麻疹的发生更频繁地在妇女。
