Beginning of sorrows; ὠδι ìνων: labour pangs, travailings. The metaphor often occurs (see Isaiah 26:17; Jeremiah 13:21; Hosea 13:13, etc). These great events are called "labour pangs" because they usher in the new creation, "the regeneration" spoken of in Matthew 19:28 (see note there).
St. Paul writes (Romans 8:22), "The whole creation groaneth and travaileth in pain together until now." The tribulations and calamities which preceded and accompanied the overthrow of the Jewish polity are a sign and warning of the great and universal woes Which shall herald the day of judgment.
Jewish writings speak of "the sorrows of Messiah," distresses, wars, famine, dissension, etc., which should herald his advent, and Christ may have used the popular opinion, true as far as it went, as a vehicle for conveying the further truth, that the coming age would be produced amid terrible agonies of men, peoples, and nature.