Difference between 好累 and 很累

Question

我很累。

我好累。

What's the difference between those sentences? Both seems to mean "I'm tired".

Answer 1

好 is more describing the feeling of your heart.

我做了那麼多，都沒用。我好累。

I did so much. But nothing is useful. I feel really tired.

很 is just describing you're physically tired.

我跑了10公里。我很累了。

I've run for 10km. I'm very tired.

In most cases, 『好』 is more than 『很』. Just like the example above.

Answer 2

In southern China (at least in the 浙江/江苏/上海 area I've been in), 好 is a perfectly acceptable substitute for 很 in almost all circumstances. For example:

你的脸好红哦!

他好坏。

我好喜欢你。

There isn't really a semantic difference, except that 好 is more informal. Also, there are a few circumstances where it would be confusing to use 好 instead of 很.