Understanding What Causes Lower Back Pain

How the Lumbar Spine Contributes to Lower Back Pain

The spine is made up of several sections:

• The cervical spine, or the neck, is made up of 7 vertebrae (C1–C7).
• The thoracic spine, is made up of 12 vertebrae (T1–T12).
• The lumbar spine, or lower back, is made up of 5 vertebrae (L1–L5).

The lumbar spine, or lower back, plays a crucial role by:

• Supporting the weight of your upper body
• Allowing you to bend, twist, and lift
• Helping you stay balanced when standing and walking

This region is most commonly affected by pain because it carries a significant portion of the body’s weight and is mobile, allowing for a wide range of movements. This makes it more vulnerable to strain and injury. The lowest lumbar vertebrae, especially L4 and L5, absorb the most stress during daily activities like lifting or twisting. 

Additionally, the low back vertebrae L5-S1 are the most affected by disc herniation.^[1]This occurs when the intervertebral disc located between vertebrae begins to protrude and press on nearby spinal nerves, causing pain.

Today, low back pain is widespread and remains the leading cause of years lived with disability worldwide. Currently, over 619 million people worldwide are affected each year, and the number is expected to keep rising.^[2]

Symptoms Commonly Associated With Lower Back Pain

Lower back pain can vary in nature, location, and intensity, depending on what’s causing it. Some people experience mild discomfort, while others may have more intense symptoms that interfere with their everyday life.

The symptoms you notice are often linked to how the structures in your lower back are affected:

• Tenderness: Tenderness is pain when touching an area, often due to injury or inflammation. Read more about Tenderness.
• Increased Discomfort With Prolonged Sitting, Standing, Or Lifting: Maintaining a position for long periods or lifting adds pressure to the spine’s structures, further compressing nerves and leading to increased pain. Prolonged pressure also makes it harder for tissues to recover.
• Muscle Stiffness: Your lower back might feel tight or hard to move, especially after resting or first thing in the morning. Stiffness often results from swelling or inflammation of tissues that support your spine, such as ligaments and tendons.
• Limited Range Of Motion: Limited range of motion is reduced joint movement, often caused by stiffness or injury. Read more about Limited Range Of Motion.
• Muscle Spasm: A muscle spasm refers to involuntary tightening, often caused by fatigue or nerve irritation.
• Radiating Pain: Radiating pain refers to discomfort that spreads from one area to another, often along a nerve path. Read more about Radiating Pain.
• Numbness: Numbness refers to a loss of sensation, usually caused by nerve compression or damage.
• Leg Weakness: Leg weakness is reduced strength, commonly resulting from nerve issues or muscle atrophy.

When To Seek Medical Attention For Lower Back Discomfort

Mild or temporary lower back discomfort is normal. It can happen due to poor posture or position while sleeping, or after intense exercise. However, some symptoms may indicate a more serious problem:

• Persistent pain lasting more than a few weeks
• Pain that gets worse or does not improve with rest
• Significant loss of movement or flexibility
• Numbness, tingling, or weakness in your legs or feet
• Pain that interferes with your daily activities
• Difficulty controlling your bladder or bowels

These symptoms can indicate injury to spinal nerves, which can lead to severe neurological conditions if unaddressed.

If your lower back discomfort does not improve, or if it worsens over time, seek a medical evaluation. Early attention can help prevent further issues and support better recovery.

Possible Causes Behind The Concern

Back pain can have many causes and risk factors. Common ones include:

• Repetitive Stress Or Overuse From Daily Activities: Actions like frequent bending, lifting, or twisting can strain the muscles and joints in your lower back. This repeated stress may cause inflammation and pain. Ongoing stress may also speed up the degeneration of intervertebral discs, which is a main contributor to low back pain.^[3]
• Reduced Flexibility Or Strength In Supporting Muscle Groups: When your core or hip muscles are weak or tight, your lower back has to work harder to support your body. This undue and ongoing stress can increase the risk of strains or injury.
• Compression Of Nearby Nerves: Swollen or slipped intervertebral discs, bone spurs, or tight muscles can press on nerves in your lower back. This pressure can cause pain, tingling, or numbness that sometimes radiates to the legs or feet.
• Spinal Misalignment From Reduced Disc Cushioning: Over time, the discs between the bones in your spine can lose moisture or height. This loss of cushioning may cause your spine to become misaligned, leading to stiffness or pain.
• Imbalanced Posture: Poor sitting or standing habits put uneven pressure on the lower back. Over time, this imbalanced posture can strain muscles and ligaments and contribute to faster disc degeneration, contributing to chronic back pain.
• Prolonged Inactivity: Long periods of sitting or lying down can weaken the muscles that support the spine.
• Past Injuries: A previous strain, sprain, or accident can make your lower back more prone to new injuries. Additionally, improper healing and scar tissue formation can press on spinal nerves, causing back pain symptoms.

Underlying Medical Conditions

Some medical conditions could be at the root of your back pain. While the cause of your symptoms is not always obvious, it is critical to get an accurate diagnosis. This will guide treatment decisions to address underlying conditions and reduce the risk of complications and surgery.

• Slipped Disc: Slipped disc is a common term for a spinal disc that bulges or shifts out of place. It may press on nearby nerves and contribute to discomfort or weakness. Read more about Slipped Disc.
• Spinal Stenosis: Spinal stenosis is a condition involving narrowing of the spinal canal, which may lead to nerve compression and symptoms such as leg discomfort or weakness. Read more about Spinal Stenosis.
• Thoracic Radiculopathy: Thoracic radiculopathy is a condition involving nerve irritation in the mid-back region that may result in symptoms such as tingling, numbness, or discomfort around the ribs or chest. Read more about Thoracic Radiculopathy.
• Torn Discs: Torn discs refer to spinal discs with internal damage that may bulge or leak, potentially affecting nearby nerves and contributing to discomfort. Read more about Torn Discs.
• Facet Joint Irritation: Facet joint irritation is inflammation of the small joints between vertebrae, leading to localized back pain and stiffness.
• Sacroiliac joint dysfunction: Sacroiliac joint dysfunction occurs when the joint between the sacrum and pelvis moves abnormally, causing lower back or buttock pain.
• Degenerative Disc Disease: Degenerative disc disease is the wear and tear of the spinal disc with aging, often causing neck and back pain.
• Piriformis Syndrome: Piriformis syndrome is when the piriformis muscle irritates the sciatic nerve, causing pain or tingling in the buttock and leg.

How Physicians Identify The Source Of Discomfort

Identifying the cause of back pain isn’t always straightforward, as your symptoms can be caused by previous injuries, lifestyle factors, and medical conditions. That is why a comprehensive diagnostic approach is necessary to pinpoint the causes of your symptoms. Common diagnostic tests include:

• Blood Tests Or Urine Tests: These tests help rule out infections and active inflammation. They also help identify medical conditions like Rheumatoid arthritis.
• Imaging Studies: These provide the physician with accurate images of the internal aspects of your spine. Different tests are used to visualize different tissues:
  • X-ray to visualize bone abnormalities, such as fractures or arthritis.
  • CT scan to visualize both bones and soft tissues.
  • MRI to visualize soft tissues like discs, nerves, and ligaments. It helps identify herniated discs or nerve compression.
• Electromyography (EMG): This test measures how well your nerves and muscles are working. It can identify nerve irritation or injury as causing numbness, tingling, or weakness.

Proactive Steps To Support Spine Health

Taking steps early can help keep your spine healthy and lower your risk of pain in the future. Best practices include:

• Practice Neutral Posture: Try to keep your ears, shoulders, and hips in a straight line, whether sitting or standing. Good posture helps the body better distribute weight, which reduces strain on your lower back.
• Stretch Daily: Gentle stretching helps keep muscles flexible and supports the joints’ range of motion. Focus on your back, hips, and legs to reduce stiffness and support healthy movement.
• Strengthen Core Muscles: Your core includes the muscles in your abdomen and lower back. Strong core muscles support your spine and help protect it during movement.
• Set Up Ergonomic Workspaces: Invest in ergonomic furniture or arrange your desk, chair, and computer so that your back stays straight and your feet rest flat on the floor. This helps reduce the risk of slouching or twisting, which can strain your spine.
• Lift With Proper Technique: When lifting objects, bend your knees, keep the item close to your body, and use your legs—not your back—to push upward. This protects your lower back from sudden pressure and strain.