Selma Blair has revealed she was "told to make plans for dying" in a forthcoming documentary about life after her multiple sclerosis diagnosis.

The Cruel Intentions star publicly shared her MS diagnosis in October 2018 and, now, close to three years later, she is giving us an insight into how the autoimmune disease has affected her everyday life.

MS is a lifelong - currently incurable - condition that causes damage to nerves in the body and causes significant difficulty where everyday activities are concerned - these include walking, talking, and eating.

As shown in the trailer for the Discovery+ documentary titled Introducing, Selma Blair, the film follows the 49-year-old actress in her bid to undergo a potentially risky stem cell transplant in the hope of treating the condition and alleviating some of her more severe symptoms.

Check out the trailer for the upcoming Discovery+ documentary Introducing, Selma Blair:

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At one point in the very poignant trailer, Blair declares: "I was told to make plans for dying, not because I have MS, 'cause I’m fighting MS."

Blair underwent the procedure in 2019, which also entailed undergoing chemotherapy in order to reset her immune system. She was made to isolate at the hospital for some weeks after the stem cell procedure, it was revealed.

The emotional project was filmed by director and producer Rachel Fleit, who told Vanity Fair that watching the procedure as she captured it on her cellphone was "one of the five most extraordinary moments in my life".

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The film also includes personal moments for the actress including a scene of her nine-year-old son Arthur Saint Bleick helping her shave her head and of the duo spending quality time with one another.

In an interview with Vanity Fair about the project, the actress said: "I had the conviction of thinking I had something to share. You keep opening windows or closing doors and finding tools.

"I hope my little life gives someone who needs it some hope or a laugh or more awareness of ourselves. I hope the film shows that MS varies. That people’s strengths and weaknesses vary. All the emotions of life make healing variable too. For all of us."

Featured image credit: Ovidiu Hrubaru / Alamy

Selma Blair says she was told to 'make plans for dying' amid MS battle