This high-functionality smartphone has many convenient features.

His high-functioning smartphone greatly helps his daily life.

He has problems with executive functioning.

Because he has immunodeficiency, he always pays attention to his health management.

He is facing the problem of erectile dysfunction.

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

His younger brother has mutism and cannot speak.

My younger sister is suffering from candidiasis.

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

Prevention of infectious diseases is important with hand washing and wearing masks.