Celine Dion admits she feels like she's 'being strangled' when she tries to sing

Celine Dion is opening up about her battle with Stiff Person Syndrome, a rare neurological disorder that causes debilitating muscle spasms.

The Grammy-winning singer, 56, told Hoda Kotb of NBC's Today show that singing has become extremely difficult.

"It's like someone pushing your larynx this way," Dion said, gesturing at her throat.

"It's like you're talking like that. And you cannot go higher and lower. It gets into a spasm."

Dion demonstrated how the spasms cause her fingers to cramp up "where you cannot unlock them."

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Kotb noted that Dion broke a rib "as the result of one of those spasms."

The Canadian superstar, who has sold over 200 million albums worldwide, was diagnosed with stiff person syndrome last year.

The rare disorder attacks the nervous system and causes muscles to stiffen uncontrollably.

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In a trailer for an upcoming documentary, "I Am: Celine Dion," the "My Heart Will Go On" singer discussed her health struggles from inside her $5 million Las Vegas home, where she continues physiotherapy.

Recently in a trailer for her upcoming documentary I Am: Celine Dion, the Grammy-winning singer revealed she has been diagnosed with stiff person syndrome.

"I have been diagnosed with a very rare neurological disorder and I wasn't ready to say anything before," Dion, 54, says in the clip. "But I'm ready now."

The documentary chronicling Dion's health journey is set for release later this year.