On the mend

Getting better after an illness or injury.

Examples

My knee was really painful last week, but it's on the mend now.
Good news – Mum is home from hospital and on the mend.

How to use it

Informal. Can also describe things like the economy or a relationship.

back on your feetHealthy or successful again after an illness or difficult period.
as right as rainCompletely well again, especially after an illness or problem.