Market Structure Shift (MSS)

Market structure is the pattern of swing highs and swing lows on a chart. In an uptrend, price makes higher highs and higher lows. In a downtrend, it makes lower highs and lower lows.

A market structure shift (MSS) is when price breaks a key swing point in a way that goes against that pattern. It suggests the trend may be changing direction. It is a chart-reading idea used by price-action traders, not a rule of the market.

Imagine a stock in an uptrend with swing lows at $100, $104 and $108, and swing highs at $110, $114 and $118. Then price drops and closes below $108, the most recent higher low.

The chain of higher lows is broken. Traders who use this idea would call that a bearish market structure shift and start watching for lower highs and lower lows. The same idea works in reverse for a downtrend that breaks above its latest lower high.

A change of character (CHoCH) is usually described as the first, smaller warning that the pattern is weakening. A market structure shift is treated as the stronger confirmation that follows. Traders do not all use these words the same way, so definitions vary.

A structure break is not a guarantee of a reversal. Many breaks are followed by price returning to the old trend, especially in choppy markets or on low-volume moves. Timeframe matters too: a shift on a 5-minute chart may mean little on the daily chart.

Traders who use it usually combine it with risk limits such as a stop-loss. This page is educational and is not a trading signal.