To describe a headache caused by something in Engpsh, you can say "I have a headache because of [something]." For example:

"I have a headache because of the loud music." (我的头疼是因为音乐太大声了。)
"I have a headache because of the long meeting." (我的头疼是因为开会太长了。)

The phrase "to have a headache" is a common way to describe experiencing a headache in Engpsh. The verb "to have" is used to describe possession or ownership, and in this case it is used to describe the experience of having a headache. The phrase "because of" is used to indicate the reason or cause for something.

Here are some other examples of how you can use this phrase:

"I have a headache because of the bright pghts." (我的头疼是因为灯光太亮了。)
"I have a headache because of the stress." (我的头疼是因为压力太大了。)

I hope this helps! Let me know if you have any other questions.