Not one indicator, but a reading technique that applies to nearly all of them — a genuine mismatch between price and momentum, in four distinct flavors, and a warning that only means something once price itself confirms it.
As oscillators like RSI and stochastics spread, technicians began noticing that a mismatch between an oscillator's swing and price's swing often preceded a turn.
Alexander Elder's "Trading for a Living" laid out bullish and bearish divergence systematically, most famously using the MACD-Histogram.
Later writers separated "regular" divergence (warns of reversal) from "hidden" divergence (confirms continuation) — the same mismatch, read two different ways.
Still one of the most widely taught "extra" signals — and still just a warning, never a trigger on its own.
Regular bullish/bearish warns of a reversal; hidden bullish/bearish confirms the existing trend is continuing.
RSI, MACD, Stochastic, CCI, MFI, and Williams %R all show the same underlying pattern — a genuine divergence tends to show up on more than one at once.
Divergence flags that momentum and price disagree — it says nothing about timing, and a real trend can keep going for a long time despite a visible divergence.
Regular bearish divergence appeared repeatedly on the daily chart during the 2021 bull run — well before the 2022 decline actually began.
During a pullback inside a strong uptrend, price held a higher low while the oscillator dipped to a lower low — a hidden bullish divergence, and the uptrend simply continued.
Price makes a lower low; RSI makes a higher low at the same time. What type of divergence is this, and what does it suggest?
Price makes a higher low during a pullback inside an established uptrend; the oscillator makes a lower low at the same point. What type, and what does it suggest?
A trader sees a clear regular bearish divergence on RSI, but price hasn't turned down yet. They short immediately anyway. Sound?
Price and the oscillator, watched tick by tick on the left — and the mark it leaves in the ledger on the right. A confirmed regular bearish reversal, a confirmed hidden bullish continuation — and a divergence that simply never resolved.
Price and the oscillator both make a low. Compare the two swings, then call it: regular (reversal), or hidden (continuation)?
The classic error is trading the mismatch itself. The discipline is mechanical: get the type right — regular or hidden — before deciding what it means, and wait for price itself to confirm before acting on it.
Reading price against momentum gives traders a genuinely useful, near-universal early warning — but only price itself can ever confirm which way the disagreement resolves.
Bullish divergence gives a strong buy signal; it occurs when prices fall to a new low, but MACD-Histogram traces a shallower bottom.