His younger brother has mutism and doesn't speak a word in front of people.

His younger brother has mutism and cannot speak.

His grandfather is suffering from dementia.

My younger sister is suffering from candidiasis.

She was told by her doctor to follow a special diet because of her pica.

My friend got anisakiasis after eating sushi.

He is receiving treatment for nephropathy.

He was afraid of getting infected with brucellosis from cows.

He was smiling as if he was in a state of euphoria.

He caught a moderate cold.