The sciatic nerve is the largest and longest nerve in the human body. It runs from the lower back down through the hips, buttocks, and each leg.
🧠 What it does
The sciatic nerve:
- Controls muscles in the back of the thigh, lower leg, and feet
- Provides sensation (touch, pain, temperature) to parts of the leg and foot
- Helps with walking, standing, and movement coordination
⚡ Sciatica (when the nerve is irritated)
When the sciatic nerve is compressed or inflamed, it can cause a condition called sciatica.
Common symptoms:
- Sharp or burning pain from lower back to leg
- Tingling or “pins and needles”
- Numbness in the leg or foot
- Pain that worsens when sitting or bending
🪑 Common causes
- Herniated (slipped) disc
- Spinal stenosis (narrowing of spine)
- Muscle tightness (especially piriformis muscle)
- Long sitting or poor posture
🧘 Simple relief methods
- Gentle stretching (hamstring and lower back stretches)
- Heat or cold therapy
- Light walking (avoid long bed rest)
- Proper posture while sitting
⚠️ When to see a doctor
- Severe or worsening pain
- Weakness in the leg or foot
- Loss of bladder or bowel control (emergency sign)
🧠 Simple idea
The sciatic nerve is like a major communication cable between your spine and legs, and irritation of it can cause pain that travels down the entire leg.
