1. Economic fluctuation: This is the root cause of the stock decline. From macro to micro, the economy is always in fluctuation.

2. Liquidity tightening: When liquidity tightens, the stock market generally falls.

3. The performance is lower than expected: when the performance exceeds the estimated range, the stock price will definitely rise. When the performance is lower than the forecast range, the stock price mostly falls.

4. Negative event news: Many times, negative news does not really affect the company's performance, but it has a huge psychological impact on investors, so it will also cause the stock market to fall.

Extended data:

When the index or stock price rises to a certain extent, the plunge caused by capital outflow will often be larger on the one hand, and the adjustment period may be longer on the other hand.

When the index or stock price rises to a certain extent, the plunge caused by capital outflow will often be larger on the one hand, and the adjustment period may be longer on the other hand. As investors, what we have to do is to be prepared to stop loss and take profit, protect the profits we have earned as much as possible, cash in the profits, and settle down safely. If you make mistakes in operation, you must apologize to the market in time and correct the mistakes.