What Is a Herniated Disc?

A herniated disc occurs when the soft, gel-like center of a spinal disc pushes through a tear or weakened area in its tough outer layer. Spinal discs act as cushions between the vertebrae, helping absorb shock and allowing the spine to move and bend.

A herniated disc can occur anywhere along the spine but most commonly affects the lower back (lumbar spine) or neck (cervical spine). When the displaced disc material presses against or irritates nearby nerves, it can cause pain, numbness, tingling, or weakness. Some herniated discs cause no noticeable symptoms.

What Causes a Herniated Disc?

Herniated discs often develop as a result of age-related changes in the spine. Over time, spinal discs naturally lose water content and flexibility, making them more vulnerable to damage. A sudden injury or excessive strain can also cause a disc to herniate.

Factors that may contribute to a herniated disc include:

• Age-related disc degeneration
• Repetitive bending, twisting, or heavy lifting
• Improper lifting techniques
• Sudden injuries or trauma to the spine
• Excess body weight, which places additional stress on the spinal discs
• Prolonged sitting or physically demanding activities
• Family history of disc problems

What Are the Symptoms of a Herniated Disc?

Herniated disc symptoms depend on the location of the affected disc and whether nearby nerves are compressed or irritated. Symptoms may develop gradually or appear suddenly following an injury.

Common symptoms include:

• Neck or lower back pain
• Pain that radiates into the shoulder, arm, hand, buttock, or leg
• Numbness or tingling in the affected area
• Muscle weakness in an arm or leg
• Pain that worsens with certain movements, coughing, or sneezing
• Difficulty standing, walking, or performing everyday activities

A herniated disc in the lower back may cause sciatica, which involves pain that travels along the sciatic nerve into the buttock and leg. A herniated disc in the neck may cause pain, numbness, or weakness that extends into the shoulder, arm, or hand.

How Is a Herniated Disc Diagnosed?

Your doctor will review your symptoms and medical history and perform a physical examination to evaluate your spine, muscle strength, reflexes, and sensation. Certain movements or tests may help identify nerve irritation or compression.

An MRI may be recommended to identify the location of the herniated disc and determine if it is affecting nearby nerves. X-rays may be used to evaluate the bones of the spine or rule out other conditions, while CT scans or nerve testing may be recommended in certain cases.