Why does the pain run down your leg?

Why would a back problem show up in my leg?

It is confusing. Your back feels more or less fine, but there is an ache, a tingle or a numb patch running down your leg. So you stretch the leg. You roll it out. You wonder if you pulled something.

The nerves that supply your leg do not start in your leg. They leave the spinal canal through small openings between the bones of your lower spine, then join up and travel through the buttock and down the back of the leg. When one of those nerve roots is crowded or irritated at the spine, your brain reads the signal as coming from wherever that nerve goes. Your leg is where you feel it. Your back is where it is happening.

What does nerve-related leg pain feel like?

It tends to feel different from a pulled muscle:

A strained muscle is usually sore in one spot, tender when you press on it, tied to something you did, and steadily better over several days.

• Burning, electric or shooting, more than sore
• Tingling, pins and needles, or a patch of numbness
• Usually one leg, often in a line down the back or side
• It can reach below the knee, into the calf or foot
• Often worse with long sitting, bending forward, coughing or sneezing

What crowds the nerve in the first place?

Several things can narrow the space a nerve root has to pass through:

Which one is involved matters, because they are not managed the same way. That is what an exam is for.

• A disc that bulges or herniates toward the nerve
• A disc that has lost height, which brings the bones closer together
• Joint changes that narrow the opening over time
• Less often, a tight muscle deep in the hip pressing on the nerve further down

Why doesn't stretching my leg fix it?

Because the leg is where the symptom is, not where it starts. Stretching and rolling the leg can feel good for an hour, and then the ache is back.

It can also backfire. An irritated nerve does not like being pulled on, and hard hamstring stretching puts tension on the same nerve that is already unhappy. If stretching makes the tingling sharper or sends it further down the leg, stop and have it looked at.

When should leg symptoms be checked?

Have it examined if the symptoms have lasted more than a week or two, are moving further down the leg, include numbness, or keep coming back. Nerve irritation that goes unaddressed tends to spread its symptoms further along the limb, so earlier is easier than later.

It also helps to notice what changes it. Symptoms that ease when you walk and build when you sit, or the reverse, are useful clues, and so is whether a cough or sneeze sets them off. Bring those details to your visit.

What can I do in the meantime?

While you wait to be seen, favor the positions that ease the symptoms and limit the ones that bring them on. For many people that means shorter periods of sitting, walking in short bouts through the day, and avoiding heavy lifting and deep forward bending for now.

Skip aggressive stretching, and do not push through tingling or numbness to finish a workout. Gentle, regular movement usually serves an irritated nerve better than either bed rest or hard exercise.

How does a chiropractor approach leg pain that starts in the back?

The first visit is a conversation and an exam. Your chiropractor checks reflexes, strength and sensation in the leg, and uses movement tests to see which positions bring the symptoms on or ease them. X-rays or other imaging are ordered only when the findings call for it.

If care is appropriate, the aim is to take pressure and irritation off the nerve where it starts and restore movement in the lower back. That can include chiropractic adjustments, hands-on mobility work and specific exercises. If the exam points to something that needs a medical specialist, you are told that and referred.