While slipped disc is the most common cause of sciatica, which accounts for more than 90% of cases, both can interfere with daily movement, disrupt sleep, and significantly impact quality of life.

Brittne Largent put off going to the doctor initially until her pain became unbearable. She thought she had Sciatica, but a trip to her physician led to a diagnosis of leukemia.

As the weeks went on, her pain grew worse and worse. "At nighttime, when I was trying to get ready for bed, it was excruciating pain going down from my lower back on my right side, and I couldn't ...

"A few weeks after, I started having sciatica pain, and it started progressively getting worse," the 30-year-old tells PEOPLE exclusively.