Market structure is the shape that price leaves behind as it moves. Before any entry method, indicator or strategy, most price-action traders start here: is price making higher highs and higher lows, lower highs and lower lows, or neither? This article explains the vocabulary and the common mistakes beginners make when they first try to mark structure.

Swing highs and swing lows

A swing high is a peak that has lower highs on both sides of it. A swing low is a trough that has higher lows on both sides. The simplest definition uses three candles: a candle whose high is higher than the candles immediately before and after it is a minimal swing high. Many traders use five candles, or a fractal setting, to filter out small movements.

The definition you choose matters less than using it consistently. On a one-minute chart a swing may last a few minutes; on a daily chart it may take weeks. This is why structure is always described together with a timeframe.

What counts as a trend

In an uptrend, price makes a sequence of higher highs (HH) and higher lows (HL). In a downtrend, it makes lower highs (LH) and lower lows (LL). When neither pattern holds, and price oscillates between a high and a low, the market is ranging.

  • Uptrend: HH, HL, HH, HL. Each pullback ends above the previous pullback.
  • Downtrend: LL, LH, LL, LH. Each rally ends below the previous rally.
  • Range: price repeatedly rejects the same area at the top and the bottom.

Internal and external structure

Large moves contain smaller moves. The swings that define the bigger picture are often called external structure, and the smaller swings inside a pullback are internal structure. A common beginner mistake is to treat every small wiggle as important. A useful habit is to mark the larger swings first, then zoom in only when you need detail.

A simple marking routine

  1. Start on a higher timeframe such as the four-hour or daily chart.
  2. Mark the most recent clear swing highs and swing lows.
  3. Label the sequence: HH/HL, LL/LH, or range.
  4. Note the one swing that, if broken, would change your view. This is the level that invalidates the current structure.
  5. Move to a lower timeframe only after the higher-timeframe picture is written down.

Common mistakes

Marking too many swings. If your chart looks like a ladder of lines, you are probably using swings that are too small for your timeframe.

Changing the rules mid-trade. If your swing definition shifts depending on what you hope price will do, you are looking for confirmation rather than reading the chart.

Treating structure as a prediction. A trend describes what has already happened. It does not promise that the next swing will continue the pattern. Trends end, often without warning.

Limits to keep in mind

Structure is a descriptive tool. Two experienced traders can mark slightly different swings on the same chart, and both can be reasonable. Treat the labels as a way to organise your thinking, not as a signal. Any decision to trade involves risk, including the risk of losing the capital you put in, and should be sized with that in mind.

Practice

Open a chart you have not traded. Cover the right-hand side, mark the structure you can see, then reveal a few candles at a time and note where your reading was right and wrong. Do this on several instruments and timeframes before relying on it anywhere with real money.

This article is educational and is not investment advice.