Not entirely sure.
"Visting the sick" ?
Inquire/Enquire (apparently there is a whole debate about which one is more correct)
Formal usage/sentence construction might also have an effect on whether it should be inquire after or inquire about.
"Inquire after health"
"Enquire after health"
"to ask about his health"
e.g. They called to inquire after my health.
I might enquire after your health.
Gilani visits Pagara to inquire about his health.
We enquired after her health.
Bush called to ask about the Dalai Lama's health.