Why does my lower back hurt when sitting but not when standing?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Sitting can cause lower back pain because it places up to 40% more pressure on your spinal discs compared to standing. When you sit, your hip flexors tighten, core muscles disengage, and poor posture often compresses the lumbar spine — all of which can trigger or worsen back pain.

Common contributors include:

Prolonged sitting without breaks
Slouching or hunching forward
Lack of lumbar support
Weak core and glute muscles
Underlying conditions like herniated discs or sciatica

Because lower back pain has many possible causes — some minor, some serious — it's important to identify what's actually driving your symptoms before deciding on next steps. A free, instant, online symptom check can help you narrow down potential causes based on your specific symptoms and guide you toward the right care, whether that's simple posture adjustments or seeing a doctor. It takes just a few minutes and could save you weeks of guesswork.

Reviewed for medical accuracy: 07/15/2026

Important Next Steps

Discover why sitting hurts your lower back Learn if your back pain needs care today See what could be causing lower back pain Find OTC relief for lower back pain Find a doctor for back pain evaluation Discover home remedies for lower back pain Find out if your pain needs diagnosis

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Explanation

Lower back pain that occurs when sitting but not standing can be due to how sitting affects your spine and muscles. Sitting can increase pressure on the lower back, especially if you have poor posture or sit for long periods.

Pressure on the Spine: When you sit, especially with a slouched posture, your spine can flex more, which may lead to discomfort. This is because sitting changes the way your back is aligned and increases the load on certain parts of the spine.
Muscle Strain: Sitting for too long can also cause your back muscles to become tired and strained, leading to pain. Standing up can relieve this strain, as it allows your spine to return to a more natural position and your muscles to relax.
Posture: Good posture can help reduce this pain. If you sit with your back straight and your feet flat on the floor, it can lessen the pressure on your back.

Understanding these factors can help you find ways to manage or reduce your lower back pain when sitting. Consider making adjustments to your sitting posture or taking regular breaks to stand and stretch. If your back pain persists or worsens, try our free AI symptom checker to better understand what might be causing your discomfort and when you should seek medical attention.

(References)

Maigne JY, Lapeyre E, Morvan G, & Chatellier G. (2003). Pain immediately upon sitting down and relieved by .... Spine, 12811279.
O'Sullivan PB, Mitchell T, Bulich P, Waller R, & Holte J. (2006). The relationship beween posture and back muscle .... Manual therapy, 15953751.
O'Keeffe M, Dankaerts W, O'Sullivan P, O'Sullivan L, & O'Sullivan K. (2013). Specific flexion-related low back pain and sitting. Ergonomics, 23438303.

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