The utility model relates to a hot compress underpants, which comprises a underpants body and an extension piece. The underpants system has a underpants mouth. The extension piece extends upward from the underpants mouth of the underpants body to form a ring, so that it can cover the abdomen and waist of the wearer. The front and back sides of the extension piece correspond to the position of the wearer's uterus, and the two heating parts can generate heat to make the wearer's Keep a certain temperature in the abdomen to relieve the pain and discomfort in the abdomen and waist caused by menstruation.一種熱敷內褲，包括一內褲本體及一延伸片，該內褲本體係具有一褲口，該延伸片係由該內褲本體的褲口處朝上一體延伸呈環狀，使可包覆住穿著者的腹部及腰部，於該延伸片的前、後側對應穿著者子宮的位置處係具有兩發熱部，該兩發熱部可產生熱能使穿著者的腹部保有一定的溫度，進而舒緩女性經期所造成之腹部及腰部的疼痛不適感。
