noun
chronic disease; chronic illness
Formal or literary term for a long-standing illness, often with a nuance of deep-rooted suffering.
彼は宿痾に長年苦しめられてきた。
He has been tormented by a chronic illness for many years.
宿痾を抱えながらも、彼女は精力的に活動を続けた。
Despite suffering from a chronic disease, she continued her activities energetically.