Selena Gomez has hit back at internet trolls who have body-shamed her, resulting in her speaking about her struggles with small intestinal bacterial overgrowth.On October 29, the Only Murders in the Building star attended the debut of her new movie Emilia Perez at the DGA Theater Complex in Los Angeles.

Many people living with SIBO experience difficulty with getting a diagnosis. That's because the symptoms of SIBO closely resemble signs of other GI conditions like IBS or indigestion, according to the Cleveland Clinic. However, experts believe that IBS tends to be more pain-predominant, while SIBO is more bloating-predominant, per Yale Medicine.

Over the last few years, Selena Gomez has been pretty open about her physical and mental ... Well, the Only Murders in the Building star chimed in, sharing that she has a condition called SIBO. But what, exactly, is that? Here’s what you need to know.