Arthritis in the back is joint damage or inflammation in the spine, most often affecting the small facet joints that connect each vertebra. The most common form is osteoarthritis, a wear-and-tear condition where the cartilage cushioning those joints gradually breaks down. But several other types of arthritis can also target the spine, each with different causes and patterns of pain.
Types of Spinal Arthritis
Three broad categories account for most back arthritis. They differ in what drives the damage and who they tend to affect.
Osteoarthritis is by far the most common. It develops as cartilage between the facet joints wears away over time, leading to bone-on-bone friction, inflammation, and pain. As the discs between vertebrae thin with age, more load shifts to the facet joints, accelerating the damage. It usually affects the lower back first.
Spondyloarthritis is an inflammatory, autoimmune form of spinal arthritis. Rather than wear and tear, your immune system drives chronic inflammation in the spinal joints and in the connective tissues where ligaments and tendons attach to bone. Ankylosing spondylitis is the most common subtype, and it can eventually cause vertebrae to fuse together. Other forms include psoriatic arthritis (linked to the skin condition psoriasis), reactive arthritis (triggered by an infection elsewhere in the body), and enteropathic arthritis (tied to inflammatory bowel disease).
Rheumatoid arthritis can also reach the spine, particularly the cervical vertebrae in the neck. It’s another autoimmune condition, but instead of targeting the entheses (where tendons meet bone), it attacks the synovium, the tissue lining the inside of the joint capsule.
How Spinal Joints Break Down
The facet joints sit in pairs along the back of every vertebra. Each one is coated with smooth cartilage that lets the bones glide against each other when you bend or twist. In osteoarthritis, that cartilage gradually thins and roughens. Without adequate cushioning, the bones rub together, and the body responds by growing bone spurs (small bony projections) around the joint. Fluid-filled cysts can also form.
Clinicians grade facet joint damage on a four-point scale. Grade 1 means the joint looks normal. Grade 2 shows small but visible changes. By grade 3, there’s noticeable wear, joint thickening, and possible bone spurs. Grade 4 means severe cartilage loss with prominent bone spurs. Many people have grade 2 or 3 changes on imaging without realizing it, because the damage doesn’t always produce symptoms right away.
When bone spurs or swollen tissues grow large enough, they can narrow the spinal canal or the openings where nerve roots exit the spine. That narrowing, called spinal stenosis, is one of the main reasons back arthritis starts causing problems beyond simple joint pain.
What It Feels Like
The hallmark symptom is stiffness and aching in the lower back or neck that worsens with activity in osteoarthritis, or with rest and inactivity in inflammatory types. That distinction matters. If your back is stiffest first thing in the morning and loosens up once you start moving, the cause may be inflammatory rather than mechanical.
Osteoarthritis pain typically flares after prolonged standing, bending, or lifting. It tends to feel localized to the spine itself, often on one side more than the other. Inflammatory spinal arthritis, by contrast, often starts before age 35, comes on gradually, and produces deep stiffness that’s worst after long periods of stillness, especially overnight.
When bone spurs or disc changes compress a nerve root, symptoms can radiate. You might feel numbness, tingling, or weakness traveling down a leg (if the lower back is affected) or into an arm (if it’s the neck). Some people notice their legs feel heavy or clumsy during walking. In rare, serious cases, nerve compression can affect bladder or bowel control, which signals the need for urgent evaluation.
Inflammatory vs. Mechanical Back Pain
Because back pain is so common, one of the most useful things you can do is figure out which pattern yours follows. Three features point toward an inflammatory cause: the pain started before age 35 and came on gradually, it gets worse with immobility (particularly at night and in the early morning), and it improves with physical activity rather than rest. Mechanical back pain from muscle strain or disc problems typically behaves the opposite way. It’s triggered by specific movements, feels better with rest, and doesn’t produce prolonged morning stiffness.
This distinction shapes treatment. Inflammatory spinal arthritis often responds to medications that calm the immune system, while osteoarthritis management centers on joint protection, movement, and pain relief.
Exercise and Physical Therapy
Structured exercise is one of the most effective tools for managing spinal arthritis of any type. A 2024 clinical trial published in Rheumatology tested a year-long supervised exercise program for people with inflammatory spinal arthritis who had significant functional limitations. The program included aerobic training, muscle strengthening, flexibility work, and education on staying active between sessions. Participants started at two supervised sessions per week for the first 12 weeks, then shifted to once weekly.
After one year, the exercise group showed meaningful improvements in physical function, walking endurance (gaining about 30 meters on a six-minute walk test), and daily activity scores compared to those receiving usual care alone. The effect sizes were moderate, roughly equivalent to what you’d expect from adding a medication. For a condition that tends to worsen over time, holding ground or gaining function over 12 months is a significant result.
The types of exercise that help most combine four elements: aerobic activity (walking, swimming, cycling), strength training for the muscles that support the spine, flexibility and range-of-motion exercises, and functional movements that mimic daily tasks. You don’t need to do all four in every session, but a weekly routine that touches each category produces the best outcomes.
Sleep Positions That Reduce Pain
Nighttime pain and morning stiffness are among the most frustrating aspects of back arthritis. How you position yourself in bed can make a real difference.
If you sleep on your side, draw your knees up slightly toward your chest and place a pillow between your legs. This keeps your spine, pelvis, and hips aligned and takes pressure off the facet joints. A full-length body pillow works well if you tend to shift positions.
If you sleep on your back, place a pillow under your knees to maintain the natural curve of your lower spine and relax the surrounding muscles. A small rolled towel under your waist adds extra support. Make sure your head pillow keeps your neck aligned with your chest and back rather than pushing it forward.
Stomach sleeping puts the most strain on the spine, but if it’s the only comfortable option, placing a pillow under your hips and lower abdomen can reduce the arch in your lower back.
When Surgery Becomes Part of the Conversation
Most people with spinal arthritis never need surgery. It enters the picture when nerve compression causes progressive weakness, numbness, or loss of coordination that doesn’t respond to other treatments, or when spinal stenosis becomes severe enough to interfere with walking or daily function. Loss of bladder or bowel control is a red flag that requires prompt surgical evaluation.
The severity of symptoms, not the severity of imaging findings, drives the decision. Some people with dramatic bone spurs on an X-ray have little pain, while others with modest imaging changes have disabling symptoms. Surgery aims to relieve pressure on compressed nerves and stabilize the spine if joints have become unstable. Recovery timelines vary widely depending on the specific procedure, overall health, and how long nerve compression has been present.