Sciatica is a common condition that causes pain in the lower back, buttocks, and down the leg. It happens when the sciatic nerve—one of the largest nerves in the body—gets irritated, compressed, or injured. This nerve runs from your lower spine all the way down to your feet, so problems with it can lead to a wide range of symptoms, including pain, numbness, tingling, or weakness in the leg.

While sciatica can happen suddenly, certain factors make it more likely. Understanding these risk factors can help you take steps to protect your back and avoid long-term discomfort.

Here are eight things that can increase your chances of developing sciatica:

1. Previous Back Injuries

If you've had a back injury in the past, you're more likely to deal with sciatica later on. Injuries that aren't properly treated can weaken your spine and the surrounding muscles and ligaments. Over time, this makes your back more vulnerable to issues like herniated discs, which can press on the sciatic nerve. It's important to treat back injuries early and follow your doctor’s advice to avoid complications down the line.

2. Aging

As you get older, your risk of sciatica increases. The body naturally changes with age—muscles lose strength, joints wear down, and spinal discs become less flexible. These changes can put pressure on the sciatic nerve. Degenerative conditions like spinal stenosis or disc degeneration become more common with age, and both can lead to sciatic nerve pain. Regular physical activity and good posture can help keep your spine healthy as you age.

3. Excess Body Weight

Carrying extra weight puts added stress on your spine. This extra pressure can compress the spinal discs and irritate the sciatic nerve. Obesity is also linked to higher levels of inflammation in the body, which can make nerve pain worse. If you're overweight, losing even a small amount of weight can ease pressure on your back and reduce the chances of sciatica developing or returning.

4. Weak Core or Back Muscles

Your core muscles—including the muscles in your lower back—support your spine. When these muscles are weak, your spine has to do more work to keep your body stable. This added stress can cause wear and tear that eventually affects the sciatic nerve. Strengthening your core with regular exercise can help protect your spine and lower the risk of nerve compression.

5. Poor Sleep Habits

Not getting enough quality sleep can lead to inflammation, which affects the entire body, including your nerves. When inflammation levels are high, your chances of developing nerve pain—including sciatica—go up. Sleep problems can also lead to fatigue, poor posture, and unhealthy food choices, all of which can increase your risk. Prioritizing good sleep hygiene and managing stress are important steps to support your overall health.

6. Smoking

Smokers have a higher risk of developing different back problems, including sciatica. Along with smoke, you inhale chemicals that can cause overall body inflammation and poor blood flow to all body parts. This decreases your body’s ability to function properly and recover from injuries, thereby increasing your risk of sciatica. Quitting smoking can help you prevent sciatica or enhance the effect of sciatica treatment. 

7. Osteoarthritis

Osteoarthritis is a joint condition that breaks down the cartilage protecting your bones. When it affects the spine, it can damage the structures around the sciatic nerve. This includes narrowing of the spinal canal or the formation of bone spurs, both of which can press on the nerve and lead to sciatica symptoms. Managing arthritis with proper treatment, diet, and physical therapy may help prevent these complications.

8. Poor Posture

Your posture plays a big role in spinal health. Sitting or standing incorrectly for long periods can strain the lower back and misalign the spine. This can lead to compression of the sciatic nerve, especially if you spend most of the day sitting at a desk or driving. Practicing good posture, using supportive furniture, and taking regular breaks to move around can help reduce your risk.