Sitting with crossed legs is not forbidden, but if overused, the body will silently endure pressure—from the spine and pelvis to blood circulation. Maintaining flexible posture, combined with regular movement and self-care, can help you avoid unnecessary health consequences.

Cross-legged sitting is a familiar posture for many people, whether eating, chatting, or relaxing on a chair. This position may feel comfortable, yet experts warn that if maintained for too long, it can cause various health issues.

A study published in BMC Sports Science, Medicine and Rehabilitation found that people who often sit cross-legged have a poorer ability to perceive the posture of their lower back compared to those who sit upright. This means they are more likely to hold incorrect posture without realizing it.

Meanwhile, other medical analyses have pointed out that sitting too long in this position causes the pelvis to tilt and the spine to lose its natural curvature, thereby creating uneven pressure on muscles and intervertebral discs.

Six noticeable harms of sitting cross-legged for long periods:

1. Reduced balance ability
Cross-legged sitting weakens proprioception (the body’s ability to sense its position) in the lower back. Those who sit like this for long often cannot tell whether their back is straight or curved, which increases the risk of poor posture and, over time, spinal problems.

2. Pelvic tilt and uneven muscle pressure
When body weight shifts to one side, the pelvis becomes unbalanced. This unevenly stresses the gluteal muscles, gradually leading to a habit of leaning posture—especially risky for those with existing lower back pain.

3. Alteration of spinal curvature
Cross-legged sitting flattens the lumbar spine more than normal. Once its natural curvature is lost, discs and ligaments take on extra strain, increasing the risk of pain or even chronic conditions.

4. Hip and pelvic muscle strain
Muscles around the hips, particularly the piriformis, become overstretched, while the joint between the spine and pelvis bears high compression. This may cause hip pain, lower back pain, and even affect walking posture.

5. Impact on abdominal muscles and chest
The effects are not limited to the lower body—cross-legged sitting can also reduce chest mobility and weaken the activity of certain abdominal muscle groups. Over time, weaker core muscles make it harder to maintain body stability.

6. Restricted blood circulation in the legs
Prolonged sitting in this posture can cause leg numbness due to compressed blood vessels and nerves. One study found that after just 30 minutes, arterial blood pressure in the thigh rose significantly. In the long run, people with vascular conditions face higher risks.

How to minimize the damage?

• Avoid sitting too long: Cross your legs only briefly, then switch posture.

• Change position regularly: Alternate sides or return to an upright posture every 15–20 minutes.

• Support your back: Use a chair with back support or a small cushion to help maintain proper spinal alignment.

• Stretching exercises: Hip-opening stretches and abdominal strengthening can correct imbalances.

• Get up and move: After each hour of work, walk for a few minutes to stimulate circulation.