period (女生的) 例假，姨妈
I'm on my period.
我在姨妈呢！

man period “男性例假”
(男生如果有什么每月一次的不可抗事件，或者心情莫名暴躁时，可以开玩笑称之为自己的“男性例假”)
I get sick once a month. It's like my man period.
我一个月得病一次，就好像女生来姨妈一样。

allergy n.过敏
I have an allergy to animal hair.
我对动物的毛发过敏。

各种形容生病的方式：
I am sick/ill. 我病了。
be/feel under the weather 微恙，有点儿不舒服
I was so excited to get to Beijing, but then I just felt under the weather.
我本来超开心要去北京了，结果就开始身体不舒服。
Oh please, don't ask me to cook today! I'm a bit under the weather.
拜托了，今天别叫做饭，我不太舒服！

sick as a dog 病得厉害
I can't come in to work today, I'm sick as a dog.
我今天没法去上班了，我病得很严重。

I feel like crap/sh*t. 我感觉特别糟糕。

poorly adj. 身体不舒服的，健康欠佳的
I am poorly. (British English)
我身体不太舒服。

感冒各种症状：
symptom 症状
runny nose 流鼻涕
blocked/stuffed nose 鼻塞
I have a runny nose.
My nose is stuffed.
My nose is blocked.
I really hate the feeling of having a blocked nose.
我真的很讨厌鼻塞的感觉。
coughing 咳嗽
fever 发烧
stomachache 胃痛
headache 头痛

There is this stereotype about men that they are worse at handling flu than women. We call it Man Flu.
有这么一种对男性的刻板印象，认为他们面对流感的时候各方面承受能力更差。我们管这种现象叫做 man flu。

migraine 偏头痛
Have you ever experienced a migraine?
你有没有过偏头痛?
diarrhea 腹泻，拉肚子
farting 放屁