* Trump says U.S. doing well in trade talks with China
* Dollar General jumps after Q1 profit beat
* Dow down 0.11%, S&P 500 down 0.08%, Nasdaq down 0.12% (Updates to mid-afternoon, changes byline)
By Chuck Mikolajczak
NEW YORK, May 30 (Reuters) - U.S. stocks lost ground again on Thursday, as conflicting comments on trade talks from President Donald Trump and Beijing reinforced investor nervousness that a lengthy battle could be in the offing and harm global growth.
Trump said talks with China were going well but those comments were countered by a senior Chinese diplomat who said provoking trade disputes is "naked economic terrorism."
The lack of clarity around the trade battle has rattled investors of late, after the S&P 500 had risen more than 17% through the first four months of the year on optimism a trade deal between the two countries could be reached.
That optimism has faded, however, as the escalating dispute between the two countries has weighed heavily on Wall Street in May, with each of the three main indexes declining at least 5% for the month. The benchmark S&P 500 is nearly 6% lower from its closing high on April 30.
"The market is coming to that realization that we are not getting really clean or clear information and it is going to be a lot of noise and just prepare for that," said Ben Phillips, chief investment officer at Eventshares in Newport Beach, California.
"It is a difficult market right now. There are a lot of macro signals that are starting to roll over and the question is the trade dispute causing that or is it other factors."
A government report on Thursday showed U.S. inflation was much weaker than initially thought in the first quarter on a sharp slowdown in domestic demand, while growth was also slightly lower than estimated in April.
The Dow Jones Industrial Average fell 27.59 points, or 0.11%, to 25,098.82, the S&P 500 lost 2.11 points, or 0.08%, to 2,780.91 and the Nasdaq Composite dropped 9.19 points, or 0.12%, to 7,538.12.
The trade jitters helped sustain demand for safe haven debt, as U.S. Treasury yields held near 20-month lows. The yield curve between three-month bills and 10-year notes remained inverted, the inversion the widest in nearly 12 years.
That, in turn, weighed on interest-rate sensitive bank stocks, which dropped 1.5% and were on track for a third straight day of declines, while the broader financial sector declined 0.8%.
The energy sector fell 1.3%, as oil prices continued their slump in part due to a smaller-than-expected decline in U.S. crude inventories. The sector has fallen more than 10% this month.
Among stocks, Dollar General Corp jumped 7.2% after the discount retailer's same-store sales and profit topped expectations.
Viacom Inc climbed 3.6% after report that CBS Corp is preparing for merger talks with the media company. CBS rose 2.5%.
PVH Corp plunged 14.2% as the worst performer on the S&P 500, after the Calvin Klein owner cut its annual profit forecast as it grapples with tariffs and slowing retail growth.
Declining issues outnumbered advancing ones on the NYSE by a 1.11-to-1 ratio; on the Nasdaq, a 1.38-to-1 ratio favored decliners.
The S&P 500 had 1 new 52-week high and 25 new lows; the Nasdaq Composite 25 new highs and 119 new lows. (Reporting by Chuck Mikolajczak; Editing by Steve Orlofsky)