With just one victory since Christmas, the Hammers are in dire form - and it didn't get any better as Arsenal swept them aside at the Emirates Stadium.
West Ham held firm until the stroke of half time, when Olivier Giroud crashed home a superb shot following beautiful link-up play between Mesut Ozil and Aaron Ramsey.
Ramsey then made it 2-0 to Arsenal after a period of West Ham pressure, before Mathieu Flamini added gloss to the win with the third goal to send the Hammers back to East London empty handed again.
The focus after the defeat has unsurprisingly been surrounding the future of manager Sam Allardyce, with many fans taking to Twitter to demand his sacking.
Allardyce is out of contract at the end of this season and the expectation is that West Ham will let him leave Upton Park after a torrid run of form.
That can't come soon enough for many West Ham fans, who tweeted their disappointment with the result as well as Allardyce's tactics - though some felt it was harsh to criticise him after a defeat to such a good Arsenal side.
Here are some of the reactions from West Ham fans as Allardyce comes under increasing pressure...
Apologies in advance for having an opinion, but our current run is relegation form. He simply has to go. #AllardyceOut— The Don (@donsimon78) March 14, 2015
If we don't beat Sunderland next week allardyce should be fired before leaving the field. Dreadful tactics and poor subbing each game.— Ryan Dube (@ryan_dube8) March 14, 2015
Club cannot move forward until Allardyce is gone. Bloke's done a good job but time to move on now. Give someone fresh a chance. #WHUFC— Tom Goodman (@tomwgoodman) March 14, 2015
Can't remember ever seeing Allardyce teams give up on games as easily as our last ten games! #WHUFC— Miller ✌️ (@NicholasDMiller) March 14, 2015
Big Sam doesn't adjust to the situation, is too late to make changes and too often leaves his striker isolated. Not good enough. #WHUFC— J. Daniel Ford (@jdanielford) March 14, 2015
Are people really slagging Big Sam off because we got beat at Arsenal away. Have a look at yourselves. #WHUFC— Glenn White (@glennwhu) March 14, 2015