A while ago, I started studying RSI more in-depth, and honestly, understanding how this indicator works changed my way of analyzing charts quite a bit. It’s not that it’s the solution to everything, but when you combine it with other concepts, it really gives you an advantage.

RSI, or Relative Strength Index, is basically an oscillator that measures momentum by comparing bullish closes against bearish closes over a certain period. Most traders use it with 14 periods by default, although you can obviously adjust it according to your style. The interesting thing is that it always oscillates between 0 and 100, which makes interpretation quite straightforward.

When RSI rises above 70, we’re talking about overbought conditions. But here’s the important part: it doesn’t mean the price will automatically fall. I’ve seen assets stay in overbought territory for months if buyers remain willing to pay more. What is true is that when it finally exits that zone, it’s often just a correction within a larger bullish trend. On the other hand, below 30 we have oversold conditions, which suggest a potential rebound, but again, weak fundamentals can keep an asset bearish for quite some time.

Now, what really fascinates me is when you observe RSI and price divergence. That’s a powerful signal. Imagine the price making higher highs, but RSI making lower highs. That’s a bearish divergence, and it usually anticipates a trend reversal. The opposite also works: if the price drops but RSI starts making higher lows, we’re seeing a bullish divergence that can precede a strong rebound.

Let’s take Tesla between 2019 and 2022 as an example. In May 2019, RSI was in oversold territory, and when it exited that zone, the price started developing a clear bullish trend. Then, between June and December 2020, RSI hit overbought multiple times but never approached the mid-zone during its pullbacks. That indicated the trend remained strong. But in October 2021, something different happened: RSI failed to return to overbought like before, while the price started making lower highs. It was RSI and price divergence telling you something was changing. Indeed, in December, the uptrend was broken.

Another concept many ignore is the middle level of RSI, that point at 50. When the indicator oscillates between 50 and 70, the price tends to go up. When it oscillates between 50 and 30, it tends to go down. It’s a simple but effective way to validate if a trend is still in place. Meta Platforms is a good example: after hitting oversold in March 2020, RSI remained fluctuating between overbought and that middle level for months, confirming an upward consolidation. When it finally crossed below 50 in 2022, it was a sign that the trend had shifted.

For buy signals, you need three things: first, RSI reaching oversold; second, it returning to the normal band; and third, breaking a previous downtrend line. Taiwan Semiconductor in September-October 2022 was a classic example. RSI was in oversold, then recovered, and when the price broke the downtrend, it was time to go long.

Sell signals work the opposite way. You wait for overbought, then the indicator retraces, and finally, the breakout of the previous uptrend. Applied Materials showed this well between 2020 and January 2022. RSI was in overbought for months, but when the bearish breakout finally occurred, the price declined steadily.

Divergence trading with RSI is probably the most powerful tool you have. Broadcom at its lows showed a clear bullish divergence: the price made lower lows but RSI made higher lows. That anticipated a reversal. With Walt Disney, the opposite happened: higher highs in price but lower highs in RSI, indicating a bearish move that lasted over a year.

Now, if you want to make your analysis more robust, combine RSI with MACD. When RSI hits an extreme zone and then MACD crosses its midline in the opposite direction of the trend, you get a stronger confirmation. Block Inc between 2021 and 2022 demonstrated this: overbought RSI, then MACD crossed bearish, confirming the short position that remained open for months.

The key is to remember that no indicator works alone. RSI is an advanced tool that gives you a necessary condition, but you need to validate with price itself, with trends, supports, and resistances. RSI and price divergence is especially valuable because it shows when momentum is diverging from what the price is doing, and that often precedes significant changes. If you incorporate this into your analysis process, it will definitely improve your decision-making in the markets.