Fellow members of the indie band, which had just finished a US tour, were said to be "absolutely devastated". Cumbria police are not considering the death suspicious.
Acland, 30, was thought to have been considering his future with the band, which has had three hit singles in the alternative charts. They had just completed a difficult tour of the US to promote their latest album, Lovelife, and were planning a European tour.
A spokesman for Lush's record company, 4AD, said Acland had left London to visit his parents in Cumbria after the tour. Acland had been depressed, he said, but the reason had not been clear.
"The US tour had not gone as well as they expected it to. They have been very busy with the record as well and I think it may have taken its toll.
"They were all very tired but we never expected this. Chris was always so happy but obviously down in there somewhere was something else going on which no one had seen," he added.
It was unclear whether the band would stay together. The spokesman said: "They are absolutely devastated about what has happened and are just keeping to themselves today."
Jarvis Cocker, the star of the leading band Pulp, was a friend of Chris Acland and was also described as "very upset" last night. He has sent his deepest sympathies to Acland's parents.
Lush have a chequered history. Released in March, Lovelife was the band's fourth album and sold a relatively modest 50,000 copies.
Lush were dogged with problems after the release of the album Split in June 1994. Two singles from the album were released on the same day and it sold badly.
Acland, who was always realistic about the band, recently told NME magazine: "Even though we're on 4AD [a small independent label] we're still expected to compete with Blur and Pulp. We can't go on selling no records forever."Reuse content