When should one say “Alhamdullillah”?

Alhamdulillah literally means “All praise is due to Allah”. It is a form of expressing gratitude. Whenever a person is blessed with a favour or he finds himself in good health or in a good condition or something brings him happiness, he should express his gratitude to Allah by saying Alhamdulillah. In fact, a Muslim should be praising Allah in all conditions, for every condition is good for a Muslim, be it in comfort or hardship.

Rasulullah (Sallallahu Alaihi Wasallam) has said:

Amongst the first people who will be called to enter Jannah will be those who praised Allah in conditions of comfort and hardship. (al-Mustadrak by Hakim with the confirmation of authenticity by Imam Dhahabi, Hadith #: 1851, Narrated by Ibn Abbaas)

One should also praise Allah when commencing and ending his/her Dua to Allah.

And Allah Knows Best