Illness can affect anyone.

Alzheimer's disease is a neurodegenerative disease.

Coeliac disease is an intolerance to gluten.

Heberden's disease is a form of osteoarthritis affecting the finger joints.

I took a sick leave last week.

I took a sick day yesterday to rest.

Mental illness can affect anyone.

The infectious disease spreads rapidly in the population.

Health insurance is mandatory in France.

Health insurances cover medical expenses.