Some surgeons believe – though there is no consensus – that there is a difference between capsular contractures developing in the initial months following surgery and one that occurs a year or more later. The early contracture is thought to be due to factors present around the time of surgery, eg bacteria, blood, and the body’s healing response. Late contracture is thought to occur as a result of some breakdown of the immune system, secondary "seeding" of the implant by bacteria, or even inflammation caused by a microscopic "bleed" of silicone from within the implant shell. Some patients will give a history of their breasts becoming painful and swollen following a tooth cleaning, a severe bout of diarrhea, or after an infection elsewhere in their body. Some surgeons feel that early contracture is a more intense process and harder to treat.