Selma Blair believed she was in the last days of her life, during the shooting of a documentary to be aired in October, after her battle with multiple sclerosis. The actress, known for her roles in movies like "Cruel Intentions" and "Legally Blonde", was diagnosed with this condition in 2018.

"Introducing, Selma Blair" explores Blair's journey of acceptance and recovery as her condition progresses.

The 2-minute trailer, released Thursday, begins with the actress walking carefully up the stairs to her home, as she says:

"I always thought I was on a reality show."

"Like I was in a documentary, but only God would see it and not approve," she added as she reached the bottom of the stairs and took a pose in the mirror.

There are moments when the actress leaves room for quiet reflection, while sharing moments shot in the hospital while undergoing chemotherapy.

"I was told to make death plans," Blair was quoted as saying in the trailer. "Not because I have MS, because I'm fighting MS."

When Blair first discovered her diagnosis in 2018, she said she had experienced symptoms for years, leading her to believe she may have had the disease for more than a decade.

According to the Mayo Clinic, multiple sclerosis is a lifelong condition that affects the brain and spinal cord and causes the immune system to attack the protective sheath that covers the nerve fibers. This can lead to problems with vision, arm or leg movement, sensation or balance.

Source: CNN