A lumbar support pillow is a type of pillow that is designed to help support your lower back. They are commonly used by people who suffer from pain in their lower back or neck, and can be helpful in relieving pressure on your spinal cord. Lumbar support pillows are typically made from a soft, plush material, and come with a built-in strap to keep it secure in place. Some models also have a side pocket to hold medications or other objects.