He died of disease after a long illness.

I'm feeling down because of May sickness.

He takes medicine every day because he suffers from depression.

How does this pathogen infect humans?

My sick friend is fighting his illness with cheerfulness every day.

He is showing symptoms of catatonia.

His child is suffering from rickets.

My sister has celiac disease, so she can't eat foods that contain gluten.

His life changed completely after he suffered from a severe illness.

He is an expert in pathology.