On Tuesday, stock-market investors were treated to a session of price swings that would have ranked with the worst of the preceding two years — but in 2018 doesn’t crack the top 20.

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None of the narratives floating around the market makes any sense. Bond yields are too high, or too low. Politics don’t matter, then they do. There’s excessive inflation, or not enough.

But one message the market keeps sending: Don’t get comfortable. Around the corner is pain. Investors are queasy in a year when the average down day is 24 percent bigger than the average up one, the biggest gap since 1948.

It played out again Tuesday as investors were treated to a session of price swings that would have ranked with the worst of the preceding two years — but in 2018 doesn’t crack the top 20. Phrased differently: The biggest decline in the S&P 500 last year, a 1.8 percent drop on May 17, would rank as the eighth largest since January. And it’s only May.

“What you don’t want to do as an investor is become too comfortable: It can be expensive,” said Donald Selkin, New York-based chief market strategist at Newbridge Securities. “The optimism about coordinated global growth was the main mantra of market bulls just a few weeks ago. Where are they now?”

Only one thing has been constant in 2018: that every few weeks equities get hammered. U.S. companies are in the midst of one of the biggest earnings expansions ever, everything from buybacks to capital spending is surging and forward valuations are cheap. But it’s proving little barrier to intermittent wipe-outs.

It often seems as if good news is on the verge of drowning out the bad. S&P 500 earnings rose 24 percent in the first quarter, analysts pushed up forecasts for this year and next, and the economy expanded at a rate that’s seen as unlikely to quicken the Federal Reserve’s pace of tightening.

Moods in the market brightened. The VIX market volatility index eased. Data from Investors Intelligence’s weekly survey showed newsletter writers classified as bulls reached the highest in almost two months. Statistics from Ned Davis Research reflected a similar trend. Everyone’s favorite stocks, the Faang block of top tech stocks (Facebook, Apple, Amazon, Netflix, Google) vaulted to records just last week.

Then political uncertainty in Italy flared up, sending ripples across Europe. And the S&P 500, which had swung an average of 0.3 percent the previous 10 sessions, fell four times that on Tuesday, closing down 1.2 percent. The Cboe Volatility Index spiked 29 percent, the most since March, to 17.02.

Ten-year yields dropped by the most since at least November 2016 to 2.78 percent. Half a month ago, when yields were at 3.1 percent, such a decline would probably have sparked an equity rally. Not Tuesday. A one-day dent to sentiment amid political uncertainty in Italy is nothing to lose sleep over, according to John Stoltzfus, chief investment strategist at Oppenheimer.

“For all the talk about increased market volatility, it’s worth noting that a read of the VIX” showed “a level of 13.22 at last Friday’s close,” Stoltzfus said in a note. “That’s a drop of over 64 percent from when it spiked in February to a level of 37.3. Investors are now less worried about near-term prospects for the market than they were in late January and early February.”

Despite that, “Markets like to fret over the worst-case scenarios which, unsurprisingly, almost never happens,” said Michael Antonelli, an institutional equity sales trader and managing director at Robert W. Baird & Co.

“Honestly, we’ve all had our hand too close to the flame (2011 European crisis) so when something there flares up we all recoil in horror.”