(Aging Untold) - Lupus can bring pain, exhaustion and unpredictability that aren't always visible from the outside.

Gerontologist "Sam" Cradduck shared her personal experience living with lupus after a viewer wrote in asking about the disease, offering a rare, candid look at what it's really like to live with an autoimmune condition that others often can't see.

'Living with uncertainty is tough' Cradduck said the hardest part of lupus isn't just physical - it's not knowing what each day will bring.