The 30-year-old actress, however, was released after a series of tests, reported PageSix.
As of now, no further details are known about Dunham's health issue. While, both Dunham and her representative have not released any official statement regarding the incident, the source said the actress is now doing well.
Meanwhile, Dunham has long been open about suffering from endometriosis. She has also become a foremost advocate for awareness of the illness.
Last month, the actress underwent her fifth surgery for the painful ordeal.