Few words cause more anxiety among new investors than correction. It sounds like something has gone badly wrong. In reality, corrections are a normal, regular part of how stock markets work, and understanding them is one of the best defences against panic decisions.
What a correction is
A stock market correction is usually defined as a fall of at least 10 per cent from a recent peak, but less than 20 per cent. The 10 per cent figure is a convention rather than a law of nature, but it is widely used by the financial press and analysts. A fall of 20 per cent or more is normally called a bear market. Smaller dips of 5 per cent or so are often described simply as pullbacks.
The measurement is always taken from the most recent closing high. If an index peaks at 8,000 and closes at 7,200, it has fallen 10 per cent and is in correction territory.
How often they happen
Corrections are far more common than most beginners expect. Historically, major US indices have experienced a correction roughly once every year or two on average, although the timing is irregular. Many corrections recover within a few months. Some turn into bear markets, and that is the uncertainty every investor faces when one begins.
What causes them
The trigger can be almost anything that shakes confidence: rising interest rates, a disappointing run of company results, a geopolitical shock, a spike in oil prices or simply valuations that have run too far ahead of earnings. Often it is a combination. In October 2026, for instance, worries about how much technology giants were spending on AI, oil above $110 a barrel and heavily one-sided hedge fund positioning all combined to drive sharp falls in the Nasdaq, as our Morning Market Brief described.
Correction or something worse?
There is no reliable way to know in advance whether a 10 per cent fall will stop there. Traders look at a few clues. Are company earnings still growing, or are forecasts being cut? Are bond yields falling to cushion valuations, or rising? Is the selling concentrated in one sector, or spreading across the market? Is the economy heading for recession? Corrections that happen while profits are rising and the economy is healthy tend to be shorter.
How traders approach them
Short-term traders often see corrections as opportunities, because volatility rises and price swings become larger. Clear support levels, such as previous lows or round numbers, become reference points. Risk management matters more than usual, because moves can be fast and gaps overnight more common.
Longer-term investors often take a different view. For someone investing regularly for decades, a correction can mean buying more shares at lower prices. The biggest mistake is usually selling everything in a panic near the low and then missing the recovery.
What not to do
Avoid making decisions purely on headlines, which tend to be loudest at the worst moment. Avoid adding leverage to try to win back losses quickly. And avoid assuming that because markets have recovered before, they will recover on your timetable.
The bottom line
A correction is a 10 per cent fall from a recent high, and it is a regular feature of investing rather than a sign the world is ending. Knowing that in advance helps you respond with a plan rather than with fear. If you want to see how well your own plan would hold up in a falling market, take the free Samuel & Co Trading Trader Assessment.
