Los Angeles , California ( CNN ) -- Disney star Demi Lovato had an `` altercation '' with a dancer on her concert tour before dropping out of the show to seek help with what her publicist called `` emotional and physical issues , '' a source close to Lovato 's camp said Tuesday . Lovato left the world tour with the Jonas Brothers and checked into an inpatient treatment center last weekend , a statement released by her publicist said Monday . The altercation with the dancer , which the source did not describe , may have led to Lovato 's decision to leave , the source said . The same source denied media reports that Lovato fought with actress Ashley Greene , the current girlfriend of Joe Jonas . Lovato recently suffered a public end to a short romance with Jonas , one of the three brothers she had been traveling the world with . `` Demi Lovato left her tour early this weekend in order to seek medical treatment for emotional and physical issues she has dealt with for some time , '' the publicist 's statement said . The publicist cautioned against describing the treatment as `` rehab . '' `` Demi has decided to take personal responsibility for her actions and seek help , '' the statement said . `` She is doing just that . '' The entourage was scheduled to perform in Chile , Brazil and Argentina over the next two weeks . `` She regrets not being able to finish her tour , but is looking forward to getting back to work in the near future , '' the statement said . No act will be added to replace Lovato on the tour , which has only six shows remaining , a source close to the Jonas Brothers said . The 18-year-old singer-actress has talked extensively about being bullied while in middle school . `` People say sticks and stones may break your bones , but names can never hurt you , but that 's not true , '' Lovato wrote on a anti-bullying website last month . `` Words can hurt . They hurt me . Things were said to me that I still have n't forgotten . '' Along with her solo music career , Lovato co-starred in Disney 's `` Camp Rock '' movies . She also has the lead role in Disney 's TV series `` Sonny With a Chance . '' CNN 's Denise Quan contributed to this report .
NEW : An `` altercation '' with a tour dancer preceded Lovato 's decision , source says . NEW : Source denies Lovato fought with Ashley Greene . Jonas Brothers will not replace Lovato on their tour . Lovato checks into an inpatient facility for treatment .