NEW YORK ( TheStreet) -- Arena Pharmaceuticals (Nasdaq: ARNA) is trading at unusually high volume Thursday with 31 million shares changing hands. It is currently at 13.5 times its average daily volume and trading down 4 cents (-2.2%) at $1.77 as of 3:55 p.m. ET. Arena has a market cap of $232.2 million and is part of the health care sector and drugs industry. Shares are down 3.2% year to date as of the close of trading on Wednesday. Arena Pharmaceuticals, Inc., a clinical-stage biopharmaceutical company, engages in discovering, developing, and commercializing oral drugs in the therapeutic areas of cardiovascular, central nervous system, inflammatory, and metabolic diseases. TheStreet Ratings rates Arena as a sell. The company's weaknesses can be seen in multiple areas, such as its disappointing return on equity, weak operating cash flow and generally weak debt management. You can view the full Arena Ratings Report. See all heavy volume stocks in our stocks moving on unusual volume list or get investment ideas from our investment research center. Interested in other stocks that are falling on unusually high volume? Get free SMS text alerts sent to you when the action happens by texting HVDOWN to 95370 or select from multiple alert options.