My friend is troubled by alopecia.

He is suffering from depression.

He is suffering from severe depression.

He got decompression sickness after diving.

He always thinks he is sick because of his hypochondria.

He is suffering from peasant syndrome.

She is very short due to dwarfism.

He was hospitalized due to thrombosis.

He has a hypersensitivity to pollen.

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