Why a common cold could kill 90 Day Fiance's Stephanie Matto

90 Day Fiancé: Before the 90 Days is back for its fourth season, and though the show doesn't premiere until February 23, its trailer already has fans talking. Drama is always a part of the 90 Day Fiancé formula, of course, but one particularly intriguing bit of information comes from the storyline of the franchise's first same-sex couple: Stephanie "Stepanka" Matto, a YouTube star, and her girlfriend, Erika Owens, a photographer (via TV Insider).

Viewers can see from the TLC trailer that Matto's mother warns her daughter that she doesn't think it's safe for her to visit Erika in Australia due to her health. Matto explains to the camera, "With my health condition, a common cold can kill me." Her mother wonders, "It's such a risk, why are you doing this?" (via Cheat Sheet). But what exactly is Matto's health condition?

Stephanie Matto has aplastic anemia

In 2016, Stephanie was diagnosed with aplastic anemia, a rare bone marrow disorder that can be fatal (via Starcasm). This means Matto's body doesn't produce enough new blood cells and can lead to fatigue, infections, and uncontrollable bleeding (via Mayo Clinic). Matto began to have blood transfusions every other day and also began the experimental process of injecting horse proteins. She has, unfortunately, yet to find a bone marrow transplant match in the registry (via The Daily Mail).

Since Matto's therapy has suppressed her immune system, she can get sick very easily, obviously making traveling a risky situation. In fact, she needs to have a doctor's clearance to travel and many medications to ensure that she's safe.

Matto's first symptoms of her disorder were heavy bruising which occurred from the slightest touch. She told the Daily Mail, "Every single time my body would brush against anything or even carrying my bag would result in a bruise. Someone could put their hand on my arm and within an hour I'd have a bruise in the shape of fingerprints."

Will she risk it all for love? 90 Day Fiancé fans will have to tune in to see just how far Matto will go for the one she loves.