RSI: overbought and oversold are not what they sound like

Many traders treat RSI above 70 as a sell signal and below 30 as a buy signal. In reality, RSI does not measure whether a market is expensive or cheap. It measures momentum. Understanding that difference can completely change how the indicator is used.

The Relative Strength Index, or RSI for short, is one of the most widely used indicators in technical analysis. Hardly any tool is as well known, hardly any is used as frequently—and hardly any is as misunderstood at the same time. In many explanations, the RSI is reduced to two levels: above 70, a value is considered overbought; below 30, oversold. What follows seems obvious: sell at the top, buy at the bottom.

This logic is intuitive. It is easy to explain. And in this form, it is useless.  

Fig. 1: During the prolonged gold rally, the RSI regularly entered its overbought zone. Corrections mostly brought the RSI back only into the neutral range before the rally resumed. It was not until March 2026 that the RSI again appeared in the overbought zone. The gold price then continued to rise. Gold futures on the daily chart with the RSI in its standard setting. Source: tradingview.com  

The RSI was not developed to predict turning points. It is a momentum indicator. It does not measure whether a market is “too expensive” or “too cheap,” but how strong and consistent a recent movement has been. If you fail to distinguish this, you turn a tool for classification into a supposed signal—and expect something the indicator was never meant to deliver.  

Technically speaking, the RSI compares the strength of upward and downward movements over a defined period, typically 14 periods. The result is a value between 0 and 100. The higher the value, the more dominant the upward movements during that period; the lower the value, the more dominant the downward movements.  

What matters here is this: the RSI does not measure future direction. It describes a relationship in the past. It does not say what must happen next—only how the market has behaved recently.  

And this is exactly where the misunderstanding begins. A high RSI does not mean that the market has “gone too far.” It simply means that recent upward movements have been stronger than downward movements. Nothing more.  

One of the most common mistakes when using the RSI is applying the same logic in all market phases. In sideways markets, a fluctuating RSI can indeed help identify extreme zones. In trends, however, this way of thinking does not work.  

In a stable uptrend, the RSI can remain above 70 for a long time without the market making any meaningful correction. This is not a warning signal—it is a sign of strength. Conversely, in a downtrend, the RSI can stay at low levels for extended periods without any sustainable recovery.  

The RSI does not “ignore” the trend—it reflects it. The problem only arises when you derive expectations from it that do not fit the market environment.  

The RSI becomes useful when it is not read as a threshold indicator, but as a description of momentum. What matters is not where the RSI is, but how it behaves.  

If the market continues to rise while the RSI no longer makes new highs, something is changing. If the market continues to fall while the RSI starts forming higher lows, the same applies. In both cases, the movement is losing internal momentum—even if the price has not yet clearly reflected this.  

This is not a statement about direction. It is a statement about the quality of the movement. 

As with the stochastic oscillator, divergences play a central role in the RSI. A divergence occurs when price and RSI no longer show the same picture: new highs in price are not confirmed by new highs in the RSI, or new lows in price are not confirmed by the RSI.

Fig. 2: For example, the RSI tracked the upward movement in gold until around 10:03 a.m. on April 6, 2026. The continued rise in prices was no longer reflected in the RSI. This bearish divergence already hinted at the subsequent downward movement. Gold futures on the 3-minute chart with the RSI in its standard setting. Source: tradingview.com.

Such constellations indicate that the movement is still ongoing—but no longer with the same conviction. Buyers or sellers are still active, but less determined than before. Whether this leads to a correction, a sideways phase, or an actual trend reversal remains open. The RSI does not provide a trigger—it provides an indication of change.  

The usefulness of the RSI depends heavily on the market environment. In sideways phases, it can help identify zones of tension and classify movements. In trending phases, it is more useful for assessing strength or weakness within the trend—not for predicting its end.  

Anyone who tries to force turning points using the RSI is acting against what the indicator actually measures. Those who use it to observe momentum and recognize changes early are using it in line with its construction.  

The content in this article is provided for educational purposes only. It does not constitute investment advice, financial recommendations or promotional material.