a heart beat that is very irregular or too fast
心悸, 不规则心跳
医生安慰他说，偶尔的心悸可能是正常的，尤其是在压力或焦虑期间。
a very common skin condition that causes one's skin to become dry, red, itchy, and bumpy
湿疹
the infection and inflammation of air sacs in one's lungs, usually caused by a bacterial infection that makes breathing difficult
肺炎, 肺部感染
医院在她出现严重肺炎症状（包括高烧和呼吸困难）后收治她进行治疗。
a serious injury resulting from excessive exposure to severely cold weather or things, causing the freezing of the nose, toes, fingers, etc.
冻伤, 霜冻伤害
冻伤如果不及时治疗，可能会导致永久性损伤。
a medical condition during which mucus accumulates in one's nose, throat, or sinuses and blocks them
卡他, 鼻感冒
医生解释说卡他通常是过敏或感染的症状，比如普通感冒。
a feeling of being physically ill and irritated without knowing the reason
不适
分手后，她感到一种不适和缺乏动力。
any disease or virus that can be easily passed from one person to another
传染病, 感染
这部电影描绘了一个可怕的场景，致命的传染病席卷了城市，引起了广泛的恐慌。
any physical problem that might put one's health in danger
疾病, 病症
纵观历史，人类一直在与天花和结核病等广泛传播的疾病作斗争。
a condition where an excess amount of blood or other fluid accumulates in a part of the body, leading to swelling or discomfort
充血, 肿胀
她使用了一种减充血喷雾来缓解鼻窦充血并减轻头部的压力。
an injury or wound to living tissue, often involving a cut, break, or trauma to the skin
病变, 损伤
医生在包扎前清洁了病变。
an open sore on the skin or inside the body that heals slowly and may bleed or produce pus
溃疡, 疮
any organism that can cause diseases
病原体, 致病菌
疫苗旨在通过刺激免疫系统识别和对抗特定的病原体来提供保护。
a mild state of being unwell, often leading to a temporary inability to perform one's usual activities
不适, 微恙
由于突然的不适，学生向学校请了短假。
a short period during which someone is suffering from an illness
发作, 一段时期
她在餐厅吃了未煮熟的鸡肉后，经历了一次食物中毒发作。
the first person known to have a certain disease, often seen as the starting point of an outbreak
零号病人, 第一个病例
卫生官员正在努力追踪零号病人的动向，以防止疾病的进一步传播。
