The Four stands firm; the Five is stability broken. Numerically five is four plus one: something extra breaks into a structure that was complete. So Fives in every suit are trouble — Five of Wands five people fighting, Five of Cups three cups spilled, Five of Swords winning with no one willing to follow, Five of Pentacles two figures in the snow.
It's the midpoint of the line, and the turn. Ace to Four is building; Six to Ten is maturing; the Five sits between them and its function is to knock down whatever wasn't strong enough. So a Five's pain isn't punishment, it's a test: only what survives it deserves to go on to the later ranks.
Where you'll recognise it: conflict, loss, exclusion, the sense that something's missing — usually sudden. Running well (Fives can), it's necessary clearing: the old doesn't leave, the Six can't arrive. Stuck, its problem is staying inside the wound — the figure on the Five of Cups keeps staring at the three spilled cups and never turns to see the two still standing.
