Usage note
“没事”常用于表示事情没有问题，不用担心。
méi shì cháng yòng wéiyú bǎozhèng qíngqīng méiyǒu wèntí, bù yòng dānxián.
‘没事’ is often used to indicate that everything is fine and there’s no need to worry.
Context note
这个词语常用于朋友之间，表示安慰或确认情况良好。
zhège cíyǔ cháng yòng zài péngyou zhījiān, bǎobǎo wènyīn huò qìngkuàng kuàilíng.
This phrase is commonly used between friends to offer comfort or confirm that everything is well.
5 examples
没事，我很快就来了。
méi shì， wǒ hěn kuài jiù lái le。
It's okay, I'll be right there.
你别担心，没事的。
nǐ bié dān xīn， méi shì de。
Don't worry, everything is fine.
他没带伞，没事，我们可以一起走。
tā méi dài sǎn， méi shì， wǒ men kě yǐ yì qǐ zǒu。
He didn't bring an umbrella, it's okay, we can walk together.
你摔倒了，没事，站起来继续玩吧。
nǐ shuāi dǎo le， méi shì， zhàn qǐ lái jì xù wán ba。
You fell down, it's okay, get up and keep playing.
我忘记带作业了，没事，明天再交。
wǒ wàng jì dài zuò yè le， méi shì， míng tiān zài jiāo。
I forgot my homework, it's okay, I'll hand it in tomorrow.
5 mini stories
小明和小红一起玩，小红不小心摔倒了，小明说：没事，别哭了。
xiǎo míng hé xiǎo hóng yì qǐ wán， xiǎo hóng bù xiǎo xīn shuāi dǎo le， xiǎo míng shuō： méi shì， bié kū le。
Xiao Ming and Xiao Hong were playing together. Xiao Hong accidentally fell down, and Xiao Ming said: It's okay, don't cry.
妈妈给小华买了一件新衣服，小华试穿后说：没事，我挺喜欢的。
mā ma gěi xiǎo huá mǎi le yí jiàn xīn yī fu， xiǎo huá shì chuān hòu shuō： méi shì， wǒ tǐng xǐ huan de。
Mom bought a new dress for Xiaohua. After trying it on, Xiaohua said: It's okay, I like it very much.
爸爸带小明去公园玩，小明说：没事，我想再玩一会儿。
bà ba dài xiǎo míng qù gōng yuán wán， xiǎo míng shuō： méi shì， wǒ xiǎng zài wán yí huì er。
Dad took Xiaoming to the park. Xiaoming said: It's okay, I want to play a little longer.
老师让同学们交作业，小丽忘记带了，她说：没事，我马上补上。
lǎo shī ràng tóng xué men jiāo zuò yè， xiǎo lì wàng jì dài le， tā shuō： méi shì， wǒ mǎ shàng bǔ shàng。
The teacher asked the students to hand in their homework. Xiaoli forgot hers and said: It's okay, I'll make it up right away.
妈妈问小明作业写得怎么样了，他说：没事，我今天已经完成了。
mā ma wèn xiǎo míng zuò yè xiě dé zěn me yàng le， tā shuō： méi shì， wǒ jīn tiān yǐ jīng wán chéng le。
Mom asked Xiaoming how his homework was going. He said: It's okay, I finished it today.
Mini dialogue
对不起，没事
A
对不起！
Duìbuqǐ!
Sorry!
B
没事。
Méi shì.
It's nothing.
你还好吗？
A
你还好吗？
Nǐ hái hǎo ma?
Are you okay?
B
我没事，谢谢。
Wǒ méi shì, xièxie.
I'm fine, thanks.
Related words and contrasts
similar
没关系
méi guānxi
it doesn't matter
Both are common replies to 'sorry' or to show something is fine.
contrast
不客气
bú kèqi
you're welcome
没事 can mean 'no problem', but 不客气 is the direct reply to 'thank you'.