"Tribulation," according to Jesus, occurs as the result of one's faith in God and is limited to the persecution
of that faith. It is distinct from other causes of persecution (i.e. racism, socio-economic class, etc.) and can
happen at any time.
The great tribulation that occurs at the end of human history commences when the "abomination of desolation" is
"standing in the holy place" and, according to Daniel (Dan 9:27),
signals the last 3-1/2 weeks of Daniel’s 70th week prophecy.
Because Jesus applies the term "tribulation" exclusively to Believers, Believers will be living
through this period, and the tribulation ends with the demise of the last Believer.
Believers who die during this period of the Great Tribulation are recognized as "tribulation
saints" (Rev 7:14) which is revealed in the first interlude of
the book of Revelation as those souls released under the altar when Jesus Christ breaks the fifth seal
For deeper study:
What and When is the Tribulation?