Have you ever felt numbness in the back of your leg, especially in the groin area, ankle or heel, or just a feeling of numbness, sometimes like a crawling sensation? Most of the time, we don't pay much attention to these things. We think, "Maybe we've been sitting still for a while" and forget about it. However, behind these symptoms, there may be a problem with a very important nerve in our body, but one that we don't talk about much. That nerve is called the sural nerve . Today, we will talk about this very nerve in this article.
Simply put, what is the sural nerve?
The sural nerve is a sensory nerve located under the skin on the back of our leg, below the knee. To be precise, it is a cutaneous nerve that carries sensation to the skin. This nerve starts in our sural area, runs down the outside of our leg, passes through our ankle, and ends at the little toe.
There's an interesting story behind the name. "sura" is Latin for "calf." So the name is a fitting reference to the location of this nerve.
Interestingly, the sural nerve is the most commonly used nerve graft in nerve repair surgery (nerve grafting) if a nerve is damaged elsewhere in the body. This is because it can be easily removed from the body and does not have a significant impact.
What is the benefit of this nerve to our body?
The main function of the sural nerve is to provide sensation. That is, it provides sensation to the skin on the back and outside of our legs, ankles, heels, and the outside of the foot. This 'sensation' includes several things.
- Touch: The feeling of something touching your leg.
- Temperature: Feeling hot or cold.
- Pain: Feeling pain even if there is no injury or bruise.
- Vibration: Feeling a vibration.
In addition to these, the sural nerve is also very important in maintaining the balance of our body. Imagine that you are walking in the dark. Even though you cannot see the ground clearly, you have some idea of where your foot is and whether the ground is flat or not, right? In this way, this nerve silently helps to maintain the balance of the body by sending information to the brain about the position of your foot.
How do you know if you have a problem with your sural nerve?
If there is any damage or pressure on the sural nerve, you may experience a variety of symptoms. It is very important to recognize these.
| Symptom | How does it feel? (How it feels) |
|---|---|
| Numbness | The back of the leg, ankle, or outside of the foot feels "dead." A feeling of numbness, as if you're under anesthesia. |
| Tingling or Burning | A tingling sensation (pins and needles) or a burning sensation like a swarm of ants. |
| Sharp or Throbbing Pain | A sharp pain, like a knife stabbing, or a throbbing pain, like a vein throbbing. |
| Sensitivity to Touch | Even a light touch that is normally painless, such as a bed sheet rubbing against the body, can feel unbearable pain. |
If you continue to have these symptoms, especially if the pain is severe, don't ignore them. It could be a sign of a serious condition, so be sure to see your doctor for advice.
What are the conditions that affect the sural nerve?
Okay, now let's see what are the main causes of damage to this nerve.
1. Nerve damage caused by diabetes (Diabetic Neuropathy)
Diabetes is very common among us in Sri Lanka. If diabetes is not properly controlled, the body's delicate nerves begin to be damaged due to prolonged high blood sugar levels. We call this diabetic neuropathy . This condition mostly affects the nerves in the legs and arms. The sural nerve is one of the main nerves that can be damaged in this way.
2. Sports Injuries
This is also a very common reason.
- Ankle sprain : Imagine you are playing a sport like cricket, netball, or volleyball and suddenly twist your leg. We call this an 'ankle sprain'. At that time, the ligaments around the ankle are stretched or torn. In this event, the sural nerve that runs nearby can also be pulled, crushed, or even seriously damaged.
- Fractures: This nerve can also be damaged if a bone in the leg (especially the fibula) breaks.
- Hard blows: A hard blow directly to the scalp can also crush the nerve.
3. Tight shoes or clothes
Some people wear very tight shoes, especially boots that go up the leg. Wearing these shoes for a long time, as well as tight straps on sports equipment like skis, can cause long-term pressure on the nerve and damage it.
How do we keep this nerve healthy?
Fortunately, there are several things we can do to keep the sural nerve, including other nerves in our body, healthy.
- Control your diabetes: If you have diabetes, the best way to protect your nerves is to keep your blood sugar levels within the right range. Follow your doctor's instructions carefully.
- Avoid smoking: Smoking is like a poison to the nervous system. When you smoke, your blood vessels become narrow, which reduces the supply of oxygen and nutrients to your nerves. Therefore, it is very important to quit smoking completely.
- Wear shoes that fit well: Especially if you play sports, wear shoes that fit your feet well and provide protection. Shoes become less protective as they age. So if you exercise regularly, it's a good idea to change your shoes at least every few months.
- Healthy diet: Certain nutrients are essential for healthy nerves. Vitamin B12 and vitamin D are two of the most important of these. Vitamin B12 helps keep the myelin sheath of nerves healthy. Vitamin B has also been shown to help reduce nerve pain. Animal foods like fish, meat, milk, and eggs are rich in vitamin B12.
Take-Home Message
- The sural nerve is an important nerve that provides sensation to the back of our legs and feet.
- Symptoms such as numbness, burning, pain, or loss of sensation in the leg can be caused by a problem with this nerve.
- Diabetes (especially uncontrolled) and accidents such as ankle sprains are the main causes of damage to this nerve.
- Controlling blood sugar levels, avoiding smoking, wearing the right footwear, and eating a diet rich in vitamin B12 can help keep nerves healthy.
- If your leg pain or numbness persists, don't ignore it. Be sure to seek medical advice.
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