标准医学术语中，“黄疸”是一种皮肤变黄的症状。
Standard medical terminology uses jaundice for a symptom yellow discolouration of skin.
通常，得到一个确定的数字是很困难的，因此你可以用粗略的标准，看多少人碰到过这些症状。
Often, it is difficult to get concrete Numbers, so you may have to look at rough criteria like how many people mention the symptom.
B12水平低引起同型半胱氨酸水平升高与许多疾病有关，包括中风和心脏病风险的增加，没有任何标准的B12缺乏症状。
Low B12 levels give rise to elevated homocysteine levels with an associated increased risk of many illnesses, including stroke and heart disease, without any classical B12 deficiency symptoms.
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