Thompson goal secured the three points for the Blues at chilly Roots Hall.
Adam Thompson's first ever Southend United goal was enough for the Blues to earn the three points at home to Blackpool in Sky Bet League 1 at a chilly Roots Hall.
Thompson – who made his first league start for the Blues last week – headed home from inside the box late into the second half, as Blues got back to winning ways in the league.
Boss Phil Brown kept the same starting XI as the one that picked up a point last week against Sheffield United at Bramall Lane.
However, there was disappointment for Brown, who had to make do without Michael Timlin in his squad after the midfielder picked up a knock.
Straight from the off, Blackpool had the first chance when loanee Andy Little fired over the bar from long range after just 20 seconds.
For Blues, Kevan Hurst – keeping his place in the side for a second week in succession – saw his volley from inside the box bounce through and into the grateful gloves of goalkeeper Dean Lyness.
Hurst went close again moments later, but saw his effort deflect off Clark Robertson and narrowly fly past the post after a shot from 15 yards.
Hurst was in the mood and after 17 minutes saw his powerful strike go narrowly wide of the target after cutting in from the left flank.
The majority of the opening 25 minutes belonged to the Blues in truth, but the visitors from Lancashire had the closest opening or the early stages.
A rare corner for Neil McDonald's side led to Tom Aldred heading back across goal, Little rising and heading for goal, but the attempt cannoned off the bar and bounced down before being cleared by a covering Blues defender.
Little was forced off five minutes before half time due to injury, with Kwame Thomas replacing him, and Thomas didn't take long to get himself into the game.
Moments after coming on, the Derby County loanee saw his cut back on the left find Mark Cullen, but the striker slashed wide when well placed.
After the break, Ryan Leonard – a man in fine form – worked Lyness from long range, with the Blackpool stopper diving down to his right to hold.
Ten minutes later and Ben Coker forced Lyness into a smart save at his near post after a wicked free kick from the edge of the box.
Soon after and Leonard saw a placed attempt from outside the box whistle just over the upright as Blues pressed for an opener.
On the hour, the visitors had another glorious chance to take the lead, with Aldred again involved.
Skipper David Ferguson's corner was taken down brilliantly in the box by the central defender, who turned but could only hit tamely at Dan Bentley, who held.
At the other end, Aldred did brilliantly to clear the danger after John White's cross almost found David Mooney six yards out.
Brown rolled the dice for the first time with 20 minutes to go as Joe Pigott entered the action in place of Hurst.
Blues kept knocking on the door and got their reward with 15 minutes remaining of the game.
Thompson rose highest to nod a deep ball in from Worrall down and past the despairing dive of Lyness to score his first goal for the club.
Lyness was called into action again with a few minutes remaining when he turned Jack Payne's effort round his left-hand post for a corner, before Payne was again denied in injury time, but that was to be the last action of the game as Blues gained another vital three points.
Blues: Bentley; White (c), Thompson, Barrett, Coker; Worrall, Leonard, Atkinson, Hurst (Pigott, 70); Payne; Mooney (Rea, 88)
Unused: T. Smith, Prosser, Bolger, O'Neill, Williams