Is it credible that the positive line covers the negative line but the MACD histogram shortens?

A bullish MACD crossover with a shortening histogram may signal weakening momentum, suggesting caution even in seemingly positive price action.

Jun 28, 2025 at 12:14 pm

Understanding the MACD Indicator in Cryptocurrency Trading

The Moving Average Convergence Divergence (MACD) is one of the most widely used technical indicators in cryptocurrency trading. It helps traders identify potential trend reversals, momentum shifts, and entry or exit points. The MACD consists of three main components: the MACD line, the signal line, and the MACD histogram. When analyzing price charts, a situation may arise where the positive line (MACD line) covers the negative line (signal line), but at the same time, the MACD histogram shortens. This phenomenon raises questions about its reliability and what it signals for traders.

What Does It Mean When the Positive Line Covers the Negative Line?

In MACD analysis, the positive line covering the negative line typically refers to a bullish crossover. This occurs when the MACD line crosses above the signal line, indicating that upward momentum might be increasing. Traders often interpret this as a buy signal, especially if it aligns with other indicators or chart patterns.

However, in some cases, even though the MACD line has crossed above the signal line, the MACD histogram starts to shorten. The histogram represents the difference between the MACD line and the signal line. A lengthening histogram suggests strengthening momentum, while a shortening histogram indicates weakening momentum.

This divergence can confuse traders. Despite a bullish crossover occurring, the shortening histogram may suggest that the momentum behind the move is not strong enough to sustain the uptrend.

Why Does the MACD Histogram Shorten After a Bullish Crossover?

The shortening of the MACD histogram after a bullish crossover is an important observation in technical analysis. It implies that although the MACD line has moved above the signal line, the rate at which momentum is building is declining. This could mean:

• The price rally lacks conviction from buyers.
• There may be profit-taking or resistance ahead, causing the momentum to slow down.
• It might be a false breakout or fakeout, where the initial move appears bullish but fails to continue.

For example, during a sharp upward movement in a cryptocurrency like Bitcoin or Ethereum, the MACD line might cross above the signal line due to sudden buying pressure. However, if the histogram begins to shrink immediately afterward, it could indicate that the buying momentum is fading and the price may consolidate or reverse.

How to Interpret This Signal in Real-Time Trading

When you observe the MACD line crossing above the signal line but the histogram shrinking, it's crucial to look beyond just the MACD indicator. Here are some steps to take:

• Check volume levels: If the bullish crossover coincides with low volume, it may not be a strong signal.
• Analyze price action: Is the price forming higher highs and higher lows? Or is it showing signs of rejection?
• Look at support/resistance levels: If the price is approaching a key resistance level, the shortening histogram might suggest failure to break through.
• Combine with other indicators: Using RSI or Stochastic can help confirm whether the asset is overbought or oversold.

Traders should also pay attention to timeframe consistency. A signal on the 1-hour chart may not carry the same weight as one on the daily chart. In volatile crypto markets, false signals are common, so context matters significantly.

Practical Example: Analyzing a Real Scenario

Let’s consider a real-world scenario involving Ethereum (ETH). Suppose ETH experiences a sudden pump due to positive news, pushing the MACD line above the signal line—a classic bullish signal. However, the MACD histogram bars start getting smaller, indicating that each successive bar shows less momentum than the previous one.

Here’s how a trader might react:

• They notice the crossover occurred near a known resistance zone.
• Volume during the move was below average, suggesting lackluster participation.
• The RSI indicator is near 70, hinting at overbought conditions.
• Price forms a shooting star candlestick, signaling possible reversal.

Putting these together, the trader may decide to avoid entering a long position despite the bullish MACD crossover, due to the weakening histogram and conflicting signals from other tools.

Common Misinterpretations and Pitfalls

Many novice traders fall into the trap of treating the MACD crossover as an absolute buy or sell signal without considering the broader context. The shortening histogram is often overlooked, leading to premature entries or missed exits.

Another pitfall is relying solely on the MACD in highly volatile crypto markets. Cryptocurrencies are prone to rapid price swings, which can generate misleading crossovers and histogram changes. It’s essential to use multiple confirmation methods before making decisions based solely on MACD behavior.

Additionally, some traders misinterpret the histogram shrinking as a reversal signal, when in fact it might just indicate a pause or consolidation phase. Timing trades based on this alone can lead to whipsaws and losses.

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Frequently Asked Questions (FAQ)

Can the MACD histogram shortening predict a bearish reversal?

While a shortening histogram after a bullish crossover may suggest weakening momentum, it does not guarantee a bearish reversal. It simply indicates that the current bullish push is losing strength. Traders should combine this observation with other tools such as support/resistance levels, volume, and price patterns to make informed decisions.

Is the MACD reliable for intraday trading in cryptocurrencies?

The MACD can be useful for intraday trading, but its effectiveness depends on market conditions. In fast-moving crypto markets, the MACD may lag behind price movements or produce false signals. To enhance reliability, traders should use it alongside volume indicators, moving averages, or order flow analysis.

Should I close my position if the MACD histogram starts shrinking after a bullish crossover?

Not necessarily. A shrinking histogram only signals a decrease in momentum—not an immediate reversal. Depending on your strategy, you might choose to tighten stop-loss levels, take partial profits, or wait for further confirmation before exiting. Always assess the broader context before making decisions.

How can I differentiate between a healthy pullback and a failed bullish crossover?

A healthy pullback usually maintains structure in price action—such as holding above a key moving average or showing bullish candlestick patterns. Conversely, a failed bullish crossover often comes with bearish engulfing candles, increasing selling volume, or breaking below critical support levels. Monitoring both price behavior and volume helps distinguish between the two.