Market Structure Explained: Trends, Ranges and Swing Highs and Lows
Lesson 2 of 10 · Beginner
What are swing highs and swing lows?
A swing high is a point after which price falls noticeably; a swing low is a point after which price rises noticeably. A common mechanical definition: a candle whose high is above the highs of the two candles before it and the two candles after it is a swing high, and the reverse for a swing low. Some traders use one or three candles on each side instead. What matters is that you choose one definition and apply it the same way on every chart.
Why do swings matter so much? Because they are places where the market said "no" once. A swing high means that at that price, selling overwhelmed buying. Traders place stops, entry orders and expectations around these points, which is why price behaviour on a return to them is usually informative.
The mechanical definition has a weakness: it counts every small wiggle as a swing. So separate major swings, which divide meaningful moves, from minor swings, the small oscillations inside a single leg. A simple test: a swing is major if it is also visible on a higher timeframe, or if the move away from it is at least as large as the recent typical range of several candles (for example one ATR).
Trends and ranges in the language of structure
Once you have swings, a trend gets a precise definition:
- Uptrend: higher highs (HH) and higher lows (HL). Each pullback stops before reaching the previous low, and each rally takes out the previous high.
- Downtrend: lower highs (LH) and lower lows (LL).
- Range: highs and lows repeat in roughly the same area; there is no sustained HH and no sustained LL. Moves overlap heavily and price keeps returning to the middle of the range.
A healthy trend usually has impulse legs that are larger and faster than its corrective legs. When corrections gradually grow to the size of the impulses, or a new high is only marginally above the old one, the trend is losing momentum. That is not yet a reversal, but it raises the odds of a range or a deeper pullback.
Markets spend a considerable share of their time in ranges or in-between states. Exactly how much depends on the market, the timeframe and your definition, and you should measure it on your own data. Even so, that general observation is enough to remember that a trend is not the default state of the market and that you should not go looking for one on every chart.
Break of structure (BOS) and change of character (CHoCH)
A break of structure (BOS) happens when price breaks an important swing in the direction of the trend; in an uptrend, that means trading through the latest HH. It signals continuation. It is better to judge a break by a candle close than by a passing wick, because a wick that pokes through a level and returns is often a failed break rather than a BOS.
A change of character (CHoCH) is the first sign of weakness in the structure: in an uptrend, price breaks the latest HL. After that you can no longer say with confidence that the structure is bullish. Note that a CHoCH on its own is not a trend reversal; the market may simply enter a range. A full reversal is usually accepted once a lower high forms after the HL break and the next lower low is then printed.
| Event | In an uptrend | Common interpretation |
| BOS | Close above the latest HH | Trend continuation |
| CHoCH | Close below the latest HL | Structure weakening; range or reversal possible |
| Reversal confirmed | LH forms, then an LL | Bearish structure |
These terms are defined slightly differently across styles. The name you choose does not matter; what matters is knowing in advance which event changes your view.
A worked example on gold
Teaching example with hypothetical numbers: on the gold 4-hour chart, suppose the major swings are: low 4120, high 4195, low 4155, high 4240 and low 4190. The structure is bullish: higher lows at 4155 and 4190, and higher highs at 4195 and 4240.
Now price rallies from 4190 but stalls at 4235, just below the previous high, and turns down. The structure has not broken; this is only a possible lower high. If price closes below 4190, we have a CHoCH: the latest HL has been broken. A structure-based trader stops looking to buy every pullback and waits to see whether 4235 settles in as a confirmed lower high and lower lows follow.
In the opposite scenario, if price bounces from the 4200 area and closes above 4240, that is a bullish BOS and the structure remains bullish. In both scenarios you did not predict anything; you simply decided in advance which event would change your mind. That is the difference between guessing and having a plan.
Common traps when reading structure
- Do not mix internal and external structure. A downtrend on the 15-minute chart can be just a pullback inside a 4-hour uptrend. Always know which timeframe's structure you are talking about.
- Not all swings carry equal weight. A low that launched a strong rally, or a high that has been tested several times, matters more than a small wiggle in the middle of a leg.
- Wick breaks are common in gold. Gold likes to poke slightly through obvious highs and lows and come back, because stop orders cluster there. Define your break criterion in advance: a candle close, or a move beyond the level by a set fraction of ATR.
- Structure inside a range is noise. In a range, tiny HHs and LLs appear meaninglessly, and any "BOS" may just be price reaching the edge of the range. Decide whether the market is trending or ranging before you label anything.
- Labelling is easy in hindsight. On a past chart everything looks obvious. The right practice is to step through the chart candle by candle (bar replay) and mark the swings in real time.
Common mistakes
- Marking every small wiggle as a major swing
- Accepting a break on a wick without a candle close
- Treating a CHoCH as a guaranteed trend reversal
- Comparing lower-timeframe structure with higher-timeframe structure without separating them
- Looking for a trend in a market that is clearly ranging
What does volume say here?
Swing highs and lows tell you where price got to; volume helps you judge how much participation the move had. In a healthy uptrend, volume is typically heavier in the impulse legs and lighter in the pullbacks. If a BOS occurs on low volume with weak or negative delta, price has broken the old high but there is little aggressive buying behind it, which often raises the chance of a failed break. A break that comes with rising volume and delta pointing the same way is usually taken more seriously.
Volume profile adds another angle: in a healthy uptrend, the daily value area tends to migrate upward. When value areas start to overlap day after day, the market is effectively turning into a range, even if the candle chart still prints a small HH. None of these clues is definitive, and sometimes the opposite happens, but combining them with structure sharpens your read. Remember that for gold, reliable volume usually comes from COMEX futures (GC) rather than the tick volume of a CFD, adjusted to CFD prices with the live basis.
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Frequently asked questions
What is the difference between BOS and CHoCH?
A BOS is a break of a swing in the direction of the current trend and signals continuation. A CHoCH is a break of a swing against the trend (for example, the latest HL in an uptrend) and is the first sign of weakening structure, not a confirmed reversal.
How many candles do I need to define a swing high or low?
The common definition uses two candles on each side, though one or three are also used. More important than the number is keeping the definition constant and separating major swings from minor ones.
Which timeframe should I use for market structure?
Traders usually read the main structure on a higher timeframe (for example the 4-hour or daily chart) and the entry detail on a lower one. The multi-timeframe lesson covers this in full.
Education only, not a recommendation to buy or sell; we never give signals. Price examples are illustrative. Test any method on a demo account first, with strict risk management.