I have a severe headache due to meteoropathy.

I have a severe headache and can't concentrate on my work.

Due to the change in weather, tomorrow's picnic might be cancelled.

I thought his behavior was really cruel.

Aldehyde is a very important compound in organic chemistry.

I think his behavior is unjust.

I think his actions are completely inhumane.

It seems like he has been poisoned by something.

He was poisoned after eating something.

He decided to descend from the mountain because he got altitude sickness.