A trend line is support or resistance's angled cousin — connecting a sequence of highs or lows to visualize a trend's direction and rate of change, not just a flat price level.
The Mechanics
An uptrend line connects a series of rising lows, acting as dynamic support beneath the price. A downtrend line connects a series of falling highs, acting as dynamic resistance above it. A valid trend line needs at least two touch points to draw and a third to meaningfully confirm it — two points alone can be coincidental, but a third touch respecting the same line adds genuine statistical weight to it holding going forward.
The steepness of a trend line matters — an unsustainably steep trend line (a stock rising too fast, too vertically) is statistically more likely to break than a gradual, sustainable trend line, since parabolic moves rarely persist.
Someone Drawing Their First Trend Lines: Wait for a third touch point before treating the line as meaningfully confirmed.
Someone Watching an Unusually Steep Uptrend: Recognize the elevated break risk in overly vertical trend lines compared to gradual ones.
Use Trend Lines the Way
- Require at least a third touch point before trusting a trend line.
- Watch for unsustainably steep angles as a break-risk signal.
- Combine with support/resistance and volume for stronger confirmation.
See support and resistance explained for the flat-level counterpart to this concept.
