She looks sick and needs to see a doctor.

She is suffering from a sickness.

I'm sick of hearing it.

Decompression sickness, also known as the bends, is a condition that occurs when a diver ascends too quickly from a deep dive.

I always get motion sickness when I ride in a car.

I experienced morning sickness during the early stages of pregnancy.

He suffered from mountain sickness during his hike.

He developed radiation sickness after being exposed to high levels of radiation.

I am sick and tired of this constant noise.

I always get sick during flu season.