Appellant Genband US LLC sued Metaswitch Networks Corp. and Metaswitch Networks Ltd. (together, Metaswitch) for patent infringement. After a jury found that Metaswitch infringed various claims of several of Genband’s patents, and that the claims at issue had not been proven invalid, Genband sought a permanent injunction. The district court denied the request, concluding that Genband had not established irreparable harm from the infringing activities. That conclusion, however, may have relied on too stringent an interpretation of the requirement, for an injunction, that the allegedly irreparable harm is being caused by the infringement. Based on the district court’s opinion and the briefing in this court, moreover, we cannot be confident of the answer to the causation question under the standard properly governing the inquiry or whether there is any independent ground for finding no irreparable harm or otherwise denying an injunction. Accordingly, we vacate the denial of the injunction and remand for reconsideration.