11/19/2025
All About the Sciatic Nerve
Did you know that the sciatic nerve is the largest nerve in your body? It begins in your lower back, travels through your buttocks, and runs down the back of each leg. It then branches into smaller nerves that reach your lower legs and feet. This nerve plays a big role in how you move and feel.
What Does the Sciatic Nerve Do?
The sciatic nerve helps control many of the muscles that let you bend your knee, move your lower leg, and move your foot and toes. These muscles are important for everyday activities like standing, walking, and running.
The sciatic nerve also carries sensation from much of the lower leg and foot. This includes feeling things like touch, pressure, or temperature. Other nerves, like the femoral nerve, help with sensation in the front and inner parts of the leg—so the sciatic nerve doesn’t do it all, but it does a lot.
What Happens When the Sciatic Nerve Gets Hurt?
Sometimes the sciatic nerve can get irritated or squeezed. This is called sciatica. It most often happens because of a herniated disc or narrowing of the spine, but injuries can cause it too.
When the sciatic nerve is affected, you might feel pain that starts in your lower back and travels down your leg. People often describe the pain as sharp, burning, or like an electric shock. You may also feel tingling, numbness, or weakness in your leg or foot, which can make walking or sitting uncomfortable.
Recognizing Symptoms of Sciatica
•Pain in the lower back that travels down the back of the leg
•Numbness or weakness in one leg
•Tingling in the leg or foot
•Trouble moving the leg or foot
•If these symptoms show up, it’s important to get medical advice. Early care can help manage symptoms and prevent longer-term issues.
Here are some ways to support your back and the nerves that run through it:
•Stay active: Gentle movement like walking, swimming, or cycling helps keep muscles strong and flexible.
•Stretch often: Stretching your lower back and hamstrings can reduce tension.
•Lift safely: Bend your knees, not your back, when picking up heavy objects.
•Use good posture: Sitting and standing with a straight, supported spine can prevent strain.
When to See a Doctor
•If you have ongoing pain, discomfort, or weakness in your legs, talk to a doctor. They can help find the cause and suggest treatments such as physical therapy or other options.
•Understanding and caring for your sciatic nerve can support your overall mobility and comfort.
Graphic shared by Dr. Abdullah Terkawi. Watch his full lecture here:
https://bit.ly/3JIYZfR