Bollinger Bands wrap a moving average in two lines that expand and contract with volatility. They tell you when a market is calm, when it's stretched, and when it's coiling for a move.
Price tends to stay inside the bands. Tagging the upper band means a strong, stretched move up; the lower band, a stretched move down. A squeeze — bands pinching tight — means volatility has collapsed and a bigger move often follows.
For Bitcoin specifically, traders watch a "bull-market support band" (built from the 20-week SMA and 21-week EMA). In healthy bull markets, pullbacks find support there and bounce. Losing it decisively has historically marked the shift from bull to bear — which is why it's one of the most-watched levels in crypto.
Don't trade band tags mechanically — in a strong trend price can "ride the band" for a long time. Use the squeeze to anticipate volatility, and the bull-market support band to judge whether the larger trend is still intact.
See the idea in action — view the bull-market support band and key resistance on Bitcoin.
Open S/R BandsCreate free accountWhat does a Bollinger Band squeeze mean?
Volatility has dropped sharply and the market is coiling. A squeeze often precedes a larger breakout — though it doesn't tell you the direction.
Is touching the upper band a sell signal?
No. In strong trends price rides the upper band. It signals stretch, not an automatic reversal.
What is the bull-market support band?
A band from the 20-week SMA and 21-week EMA that tends to support Bitcoin in bull markets; losing it often signals a trend change.