Question Summary:
If someone has suffered from cancer and then recovered with Allah’s grace; Do they need to disclose this to a potential spouse? & at what stage?

Question Detail:

If someone has suffered from cancer and then recovered with Allah's grace; Do they need to disclose this to a potential spouse? & at what stage?

Answer :

In the Name of Allāh, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
It is advisable to do so in order to avoid accusations of non-transparency and complications in the future.
 
And Allah Ta‘āla Knows Best
Fahad Abdul Wahab
Student Darul Iftaa
New York, USA 
Checked and Approved by,
Mufti Ebrahim Desai.
www.Daruliftaa.net