Being obese or overweight puts you at an increased risk of back pain. Excess weight also tends to prolong the recovery period after experiencing back pain. Studies have shown that 33% of overweight people are more likely to experience low back pain, whereas 43% are more likely to have chronic low back pain.
Increased pressure on the spine
Every extra kg of weight can add strain to the muscles in the back. This causes the lumbar spine to become tilted and stressed. With a weight around the abdomen, the pelvis pulls forward leading to worsened lower back pain. The excess weight can increase the pressure on the joints in the spine, which can cause cushiony discs between spinal bones to thin or bulge which can cause pinched nerves.
Poor Posture
A bad posture can worsen back pain even in healthy weight and at unhealthy weight the spine cannot support the extra bulk. Excess weight, especially around the abdomen, can cause gravity to shift the center of the spine to move forward which leads to poor posture. Over time this posture can strain the muscles and ligaments causing discomfort and pain.
Inflammation
Obesity can be linked to chronic inflammation which can affect joints and exacerbate conditions like osteoarthritis and joint pain.
Other health conditions
A higher body weight increases the chance of developing serious health implications such as type 2 diabetes, high blood pressure, and others affecting the spine. Herniated discs are more likely to occur due to the extra pressure on the back. High amounts of weight can strain the joints in the spine which can lead to osteoarthritis.