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.

He suffered from mountain sickness during his hike.

Sleeping sickness is a parasitic disease transmitted by the tsetse fly in tropical Africa.

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

I experienced morning sickness during the early stages of pregnancy.

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

I am eligible for sickness benefit under my health insurance.