Christina Applegate ‘sad’ about 13-year-old daughter Sadie’s POTS diagnosis but strongly believes she’s ‘going to be OK’

LOS ANGELES, CALIFORNIA: Actress Christina Applegate's daughter Sadie has been diagnosed with POTS or postural orthostatic tachycardia syndrome.

The 13-year-old daughter of the 'Married... With Children' star discussed her diagnosis on Tuesday, June 25, on Applegate's podcast 'MeSsy.'

Sadie Grace LeNoble said she now more effectively understands her mother's struggle with multiple sclerosis.

Christina Applegate's daughter Sadie reveals POTS diagnosis

On Tuesday, Sadie, 13, revealed on the 'MeSsy' podcast, "I have something called POTS. I have no clue what it actually is, but it’s something to do with the autonomic nervous system and it affects my heart."

"When I stand up, I get really, really dizzy and my legs get really weak and I feel like I’m going to pass out," she added, per Page Six.

Sadie said in the show that she had been experiencing her symptoms for a very long time but had frequently ignored them.

Sadie—who Applegate shares with her spouse Martyn LeNoble—said she "always felt like [she] was going to pass out" and that she has "multiple times a day" visited the nurse following her sixth-grade classes.

"In class, if I were to stand up then, I would be like, ‘I have to go to the nurse. I can’t do this.’ Or I’ll be in PE, and I’ll be like, ‘I have to go to the nurse,'" she exclaimed.

"They were like, ‘You’re doing this to get out of class. It’s probably just anxiety. Go back to class.’ They wouldn’t do anything for it."

She added, "Them not doing anything about it definitely hurt me physically and emotionally."

"Because I was just like, ‘This is rude and I feel sick and you’re telling me to go to PE and run laps around the football field. I can’t do that,’" Sadie said.

“I hate it for you my darling. I really hate it for you,” Applegate said to her daughter.

“I’m sad. But I love you and I know you’re going to be OK. And I’m here for you and I believe you. And thank you for bringing this to light and awareness.”

According to Johns Hopkins Medicine, postural orthostatic tachycardia syndrome, or POTS, is a chronic illness that impairs blood circulation and the autonomic nervous system.

Standing up quickly from sitting or lying down causes the heart rate of people with POTS to spike. Other symptoms include headaches, blurred vision, cognitive fog, exhaustion, headaches, palpitations, tremors, and nausea. They may also faint as well.

Sadie stated that her diagnosis has made it easier "to understand what my mom’s going through," despite the incapacitating symptoms.

Fans sympathize with Sadie fighting health battle amid mom’s MS diagnosis

Social media users took to Instagram to express their concerns over Sadie's health battle as one wrote, "Bless her heart. I have both MS and POTS so I feel for them both."

Another wrote, "Just medication and prayer. Praying that this help help get some new studies going sadly. Too young, for her. Sorry."

"She just can’t catch a break. God bless her and her family," remarked one.

Another wrote, "Thanks for sharing this. Too many people don’t understand the true pain and and being incapable."

"This poor family has had enough health issues. So very sorry for them," exclaimed another.

This article contains remarks made on the Internet by individual people and organizations. MEAWW cannot confirm them independently and does not support claims or opinions being made online.