Rock trio Sleater-Kinney is postponing its European tour while guitarist Carrie Brownstein undergoes tests to explain two severe allergic reactions that have required emergency room visits.

Rock trio Sleater-Kinney is postponing its European tour while guitarist Carrie Brownstein undergoes tests to explain two severe allergic reactions that have required emergency room visits. The trek was to begin Nov. 8 in Brighton, England, and run through Nov. 20 in Madrid.

"[Brownstein's] doctor has advised that she not travel/tour for prolonged periods of time until the condition stabilizes and further tests are conducted," reads a statement from Sleater-Kinney. "The band apologizes to all the people that this cancellation affects."

The affected dates may be made up in May to coincide with the All Tomorrow's Parties festival, which will be held May 12-14 and May 19-21 in Camber Sands, England. As previously reported, Sleater-Kinney will curate a day's worth of performances during the second weekend.

The group was touring in support of its Sub Pop debut, "The Woods," which debuted at No. 2 on Billboard's Top Independent Albums chart and has sold 59,000 copies in the United States, according to Nielsen SoundScan.