Christina Applegate's 13-year old daughter receives her own health diagnosis following mom's battle with MS

Christina Applegate's daughter is sharing how she is able to relate to her mom's illness.

The "Married…with Children" star's daughter Sadie, 13, was this week's guest on her mom's podcast, "MeSsy," which she hosts with fellow actress, Jamie-Lynn Sigler. While on the podcast, Sadie revealed she's been diagnosed with postural orthostatic tachycardia syndrome (POTS). Applegate has been diagnosed with multiple sclerosis.

"When my mom's like, 'I'm in pain right now. I'm having tremors.' If I didn't have [POTS]...