Left Leg Numbness: Causes and When to Seek Help

Numbness in the left big toe?

Hello, doctor.
In recent months, I have been experiencing frequent pain in my left lower back, as well as occasional pain in my left pelvis and numbness in my left calf.
Sometimes the pain is so severe that I cannot stand up straight.
I would like to know if this is related to my sitting posture or if it could be associated with taking oral contraceptives.
Which specialty should I consult for further examination?

Ms. Zheng, 20~29 year old female. Ask Date: 2021/06/26

Dr. Jiang Junyi reply Neurology

Hello Ms.
Cheng,
The symptoms you mentioned may be related to nerve compression caused by posture.
A herniated disc can lead to localized inflammatory responses resulting in lower back pain, which may extend to one or both sides of the buttocks or hips.
If the herniated disc compresses a nerve root, it can result in neuropathic pain (sciatica), with symptoms often manifesting in the posterior thigh, lateral calf, heel, and even the dorsum of the foot and toes.
Herniated discs can also occur due to sudden injuries, such as twisting the waist, bending to lift heavy objects, or experiencing sudden excessive force.
In addition to pain relief medications, it is advisable to strengthen the core muscle groups (including the multifidus and erector spinae in the back, transverse abdominis, internal and external obliques, and pelvic floor muscles).
Please be aware that the use of certain medications, such as hormonal contraceptives, may increase the risk of thrombosis, which could lead to symptoms similar to venous embolism (such as swelling in the lower limbs).
I recommend consulting with a neurologist or a rehabilitation physician for further evaluation and treatment.
Please ensure to practice self-protection, maintain cleanliness and disinfection, and adhere to new preventive measures before and after seeking medical care.
Thank you for your inquiry.
If you have any related questions, feel free to discuss further!
Wishing you good health and peace,
Dr.
Jiang Junyi, Taoyuan Medical Center

Reply Date: 2021/06/26

More Info

Left leg numbness, along with pain in the left lower back and pelvis, can be indicative of several underlying issues. Given your symptoms, it is essential to consider both musculoskeletal and neurological causes.

Possible Causes
1. Nerve Compression or Irritation: One of the most common causes of numbness and pain in the leg is nerve compression, often due to a herniated disc in the lumbar spine. If a disc bulges or herniates, it can press on the spinal nerves that exit the spine and travel down the leg, leading to symptoms such as pain, numbness, or tingling.

2. Sciatica: This condition is characterized by pain that radiates along the path of the sciatic nerve, which runs from your lower back through your hips and buttocks and down each leg. Sciatica can result from a herniated disc, spinal stenosis, or other conditions that compress the sciatic nerve.

3. Muscle Strain or Ligament Injury: If your job involves repetitive bending or lifting, you may have strained muscles or ligaments in your lower back or pelvis, which can lead to referred pain and numbness in the leg.

4. Poor Posture: Prolonged sitting or poor posture can lead to muscle imbalances and nerve compression, particularly if you are sitting for extended periods without proper support.

5. Pelvic Issues: Conditions affecting the pelvis, such as sacroiliac joint dysfunction or pelvic floor dysfunction, can also lead to pain in the lower back and leg.

6. Circulatory Issues: Although less common, issues with blood circulation, such as deep vein thrombosis (DVT), can cause leg pain and numbness. This is particularly concerning if you have risk factors such as prolonged immobility or a history of clotting disorders.

7. Hormonal Factors: While hormonal changes from birth control pills can lead to various side effects, they are less likely to directly cause localized pain and numbness in the leg. However, if you have recently started or changed your contraceptive method, it may be worth discussing with your healthcare provider.

When to Seek Help
You should seek medical attention if:
- The numbness persists or worsens.

- You experience significant weakness in your leg.

- You have difficulty controlling your bladder or bowels.

- You notice changes in your gait or balance.

- The pain is severe and not relieved by over-the-counter pain medications.

Recommended Specialists
For your symptoms, it would be advisable to start with a visit to a primary care physician or a neurologist. They can perform a thorough evaluation, including a physical examination and possibly imaging studies such as X-rays or MRI, to determine the underlying cause of your symptoms. If necessary, they may refer you to a physiatrist (rehabilitation specialist) or an orthopedic surgeon for further evaluation and treatment.

Conclusion
In summary, left leg numbness accompanied by lower back and pelvic pain can stem from various causes, primarily related to nerve compression, muscle strain, or poor posture. It is crucial to monitor your symptoms and seek medical advice to receive an accurate diagnosis and appropriate treatment. Early intervention can help prevent further complications and improve your quality of life.

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