By Corrie Driebusch And Saumya Vaishampayan 

U.S. stocks fell on Friday as the dollar continued to strengthen, sparking worries about corporate earnings.

The Dow Jones Industrial Average declined 236 points, or 1.3%, to 17658. The S&P 500 index fell 18 points, or 0.9%, to 2048 and the Nasdaq Composite shed 32 points, or 0.7%, to 4861.

Traders said in recent sessions the strengthening dollar has been the main driver for stock-market performance.

"The dollar has been one of the biggest surprises in terms of how it continues to strengthen," said David Lefkowitz, senior equity strategist at UBS Wealth Management Research.

There is a risk of a stronger dollar crimping U.S. earnings and slowing down the U.S. economy, he said. Even though he believes it won't have a big impact on earnings, he said the fear has been pressuring stocks.

As the dollar gains against foreign currencies, it raises investor concerns about multinational companies' earnings potential. A stronger dollar hurts profits overseas, both by dampening demand as U.S. exports become more expensive and reducing the value of profits earned in other countries.

On Friday the euro fell 1% to $1.0517, following a slight rebound on Thursday that coincided with stock-market gains. Month-to-date the euro is down 5% versus the dollar through Thursday, and it's off roughly 24% from its high against the dollar hit last March.

Some traders said the focus on the dollar can be seen in the better performance of small-cap stocks, which tend to be more U.S.-focused, compared with their large-cap counterparts. With Friday's stock-market declines, the Dow industrials and the S&P 500 are in negative territory for the year, while the small-cap Russell 2000 index, although down 0.7% Friday, is still up 1.9% year to date.

Action has been choppy in the last week as investors look for clues on the timing and pace of the Federal Reserve's rate increases, as well as the implications for stocks. That has heightened the emphasis on economic data, which the Fed has said it would closely watch in making its decision.

The Labor Department said Friday producer prices fell 0.5% in February from January. Economists surveyed by The Wall Street Journal expected prices would rise 0.3%. The producer-price index declined 0.6% in February from a year ago.

Also on Friday the University of Michigan's preliminary March sentiment index declined from a final February reading, suggesting consumers have scaled back their enthusiasm about the U.S. economy even as energy costs have remained low. The data followed last week's robust employment report for February which led to a 1.5% drop in the Dow, while Thursday's weak retail sales report boosted the blue-chip index by 1.5%.

"We're running in place," said Jim Dunigan, chief investment officer at PNC Wealth Management. "I wouldn't suggest the average investor make decisions on what the Fed is going to do," he said. The average investor should "make decisions based on is the economy improving, and is that improving the prospects for companies to generate profits," he added.

European stocks rose slightly, with both France's CAC 40 and Germany's DAX rising 0.1%.

In commodity markets, gold futures slipped 0.1% to $1150.80 an ounce.

Crude-oil futures declined 4% to $45.15 a barrel. The yield on the 10-year Treasury was down 0.8% at 2.102%. Yields fall as prices rise.

Ann Inc. posted a surprise profit in its holiday quarter on stronger-than-expected sales growth, as the company also outlined an effort to deliver an additional $35 million in cost savings by 2016. Shares of the retailer climbed 7.9%.

Intel Corp. on Thursday cut its revenue outlook for the first quarter by nearly a billion dollars, a sign that demand for personal computers is weakening amid sharp currency fluctuations and other factors. Shares dipped 1.1%.

Write to Corrie Driebusch at corrie.driebusch@wsj.com and Saumya Vaishampayan at saumya.vaishampayan@wsj.com

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