A herniated disk refers to a problem with one of the rubbery cushions (disks) between the individual bones (vertebrae) that stack up to make your spine. A spinal disk has a softer center encased within a tougher exterior. A herniated disk occurs when some of the softer center pushes out through a tear in the tougher exterior. A herniated disk can irritate nearby nerves and result in pain, numbness or weakness in an arm or leg.
Disk herniated is most often the result of a gradual, aging-related wear and tear called disk degeneration. As you age, your spinal disks lose some of their water content. That makes them less flexible and more prone to tearing or rupturing with even a minor strain or twist. Most people can’t pinpoint the exact cause of their herniated disk. Sometimes, using your back muscles instead of your leg and thigh muscles to lift large, heavy objects can lead to a herniated disk, as can twisting and turning while lifting.
Herniated Disk, Mayo Clinic (Mar. 6, 2018), https://www.mayoclinic.org/diseases-conditions/herniated-disk/symptoms-causes/syc-20354095