It's official: All three of the major U.S. stock indexes are in correction territory, if rounded to the closest whole number. Traditionally, a stock market correction is defined as a drop from a recent high of 10%, or more.

Since hitting their all-time highs, the Dow Jones Industrial Average (DJINDICES:^DJI), Nasdaq Composite (NASDAQINDEX:^IXIC), and broad-based S&P 500 (SNPINDEX:^GSPC) have all fallen 10%. The bulk of these losses have occurred since the previous Friday, with the Dow Jones dropping 666 points, 1,175 points, and 1,033 points in three of the past five sessions.

A frustrated stock trader grabbing his head and looking at losses on his computer screen.

Image source: Getty Images.

What's riled the markets, you ask? Part of the problem is the expectation that the U.S. economy is heating up. Preliminary forecasts from the Atlanta Federal Reserve suggest that the U.S. economy could grow by 5.4% during the first quarter. Such strong growth could push inflation figures higher and coerce the Federal Reserve to get more aggressive with hiking lending rates.

We've also been witnessing a move higher in Treasury yields. As T-bond yields increase in value, the lure becomes greater for investors to move out of volatile stocks and into bonds for a safer, near-guaranteed return.

The blame can also rest with subpar operating results or guidance from key tech companies. Apple's guidance left a lot to be desired, while Alphabet's quarterly profit missed Wall Street's consensus.

What you need to know about stock market corrections

Though the speed by which the major indexes have fallen over the past week might have ruffled investors' feathers, there are a few things you should know about stock market corrections.

A green chart plunging into the red, with digital quotes in the background.

Image source: Getty Images.

1. They're more common than you realize

The first thing you'll want to know is that stock market corrections happen quite often. Including the current correction, the S&P 500 has undergone 36 corrections of 10% or more, when rounded to the nearest whole number, since 1950. That's pretty much one every two years. Though the stock market doesn't necessarily adhere to averages, the point is that declines every now and then are both healthy and common for stocks.

2. Correction are often short-lived, relative to bull-market rallies

Another interesting tidbit is that stock market corrections are actually short-lived. Historically, moves lower in the Dow, Nasdaq, and S&P 500 tend to be swift. The S&P 500's previous 35 corrections lasted a grand total of 6,587 trading days, implying an average decline of fewer than 200 days per correction. By comparison, the S&P 500 has been in a bull market for more than 18,000 days since 1950. In other words, the stock market tends to trend higher far more often than it's declining. 

Largest Daily Point Losses      Largest Daily Percentage Losses 
Date Net Change % Change   Date Net Change % Change 
2/5/2018 -1,175.21 -4.60%   10/19/1987 -508 -22.61%
2/8/2018 -1,032.89 -4.15%   10/28/1929 -38.33 -12.82%
9/29/2008 -777.68 -6.98%   12/18/1899 -7.94 -11.99%
10/15/2008 -733.08 -7.87%   10/29/1929 -30.57 -11.73%
9/17/2001 -684.81 -7.13%   11/6/1929 -25.55 -9.92%
12/1/2008 -679.95 -7.70%   8/12/1932 -5.79 -8.40%
10/9/2008 -678.91 -7.33%   3/14/1907 -6.89 -8.29%
2/2/2018 -665.75 -2.54%   10/26/1987 -156.83 -8.04%
8/8/2011 -634.76 -5.55%   10/15/2008 -733.08 -7.87%
4/14/2000 -617.77 -5.66%   7/21/1933 -7.55 -7.84%
6/24/2016 -610.32 -3.39%   10/18/1937 -10.57 -7.75%
8/24/2015 -588.4 -3.57%   12/1/2008 -679.95 -7.70%
10/27/1997 -554.26 -7.18%   10/9/2008 -678.91 -7.33%
8/21/2015 -530.94 -3.12%   2/1/1917 -6.91 -7.24%
8/10/2011 -519.83 -4.62%   10/27/1997 -554.26 -7.18%
10/22/2008 -514.45 -5.69%   10/5/1932 -5.09 -7.15%
8/4/2011 -512.76 -4.31%   9/17/2001 -684.81 -7.13%
8/31/1998 -512.62 -6.37%   9/24/1931 -8.2 -7.07%
10/7/2008 -508.39 -5.11%   7/20/1933 -7.32 -7.07%
10/19/1987 -508 -22.61%   9/29/2008 -777.68 -6.98%

Data source: Wikipedia, The Wall Street Journal, Dow Jones. Table by author. 

3. Everything is relative -- no two corrections are the same

It's also important for investors to recognize that no two stock market corrections are the same, and everything is relative.

For example, the magnitude of the point decline in the Dow in three of the past five trading sessions has investors on edge. Seeing the words "historic plunge" in headlines is enough to poke at the nerves of any investor. However, those "historic plunges" in the Dow have only erased a combined 10% in value, returning the index back to its November 2017 levels, and hardly putting a dent in long-term investors' profits. On a percentage basis, neither of the Dow's 1,000-plus-point drops were anywhere close to its 20-worst single-day percentage declines of all time.

4. It's a great time to review your holdings

Fourth, stock market corrections provide the perfect opportunity for investors to review their investment portfolios -- albeit anytime is a good time to do so. If your investment thesis -- i.e., the reason(s) you bought into a business in the first place -- is still intact following a 10% decline in all three major indexes, then there's no reason to panic and sell stock.

Planting hundred dollar bills in the ground.

Image source: Getty Images.

5. You'll probably regret not buying stock during a correction

Finally, don't be afraid to pull the trigger and buy more stock during a correction. Since 1950, bull-market rallies in the S&P 500 have completely erased all 35 stock market corrections, often within a matter of weeks or months. While there are no guarantees in the stock market, buying index funds during a correction is about as close as you'll get to one.

It's also a great time to consider buying dividend-paying stocks. Dividend stocks are often profitable and have time-tested business models, making them the perfect choice to help hedge your downside and build wealth through reinvestment.

Suzanne Frey, an executive at Alphabet, is a member of The Motley Fool's board of directors. Sean Williams has no position in any of the stocks mentioned. The Motley Fool owns shares of and recommends Alphabet (A shares), Alphabet (C shares), and Apple. The Motley Fool has the following options: long January 2020 $150 calls on Apple and short January 2020 $155 calls on Apple. The Motley Fool has a disclosure policy.