Left-Sided Weakness and Pain: Possible Causes and Solutions

Numbness and weakness in the left arm and from the calf to the knee?

Hello, doctor.
I am a 19-year-old student.
Recently, I've been experiencing some issues on the left side of my body, and I would like to consult you.
I've noticed weakness and a tingling sensation in my left arm.
When I try to lift or grip things, I feel a lack of strength, and sometimes my left fingers also feel weak.
Due to my sleeping position, I often sleep on my left side and look at things while lying down, which sometimes puts pressure on my ear and arm, causing pain, but I would only change my position when it becomes uncomfortable.
Initially, it didn't seem to affect me much, but recently I've been experiencing that weakness and tingling in my left arm.
As for my left knee, I experienced pain in a specific area behind my left knee after standing for too long during a recent outing with friends.
I thought it would go away after a while, but I've recently felt that area still has a dull ache, and when I straighten my legs, the pain extends to my thigh, and I even feel weakness there.
In addition to these issues with my left arm and leg, I also have soreness in my left upper back.
I feel tightness and pain when I move my arm, and even when sitting at the computer, my left back becomes sore.
I would like to ask you if these problems are caused by poor posture or if there might be other reasons.
Additionally, what can I do to improve these issues? Thank you for taking the time to read my explanation.

Wendy, 10~19 year old female. Ask Date: 2020/02/10

Dr. Chen Shunsheng reply Rare Disease

Please seek medical attention at a neurology center as soon as possible.
This should not be related to posture, and it is important to rule out any potential lesions in the right hemisphere of the brain or cervical spinal cord.
Please make an appointment promptly.
The association with knee issues will be noted during the consultation.

Reply Date: 2020/02/10

More Info

Understanding left-sided weakness and pain can be quite complex, especially for a 19-year-old student like yourself. Your symptoms, which include weakness and numbness in your left arm, fingers, and knee, as well as discomfort in your left back, could indeed be related to poor posture, but they may also indicate other underlying issues that should not be overlooked.

Possible Causes
1. Nerve Compression: Given your description of symptoms like numbness and weakness, one potential cause could be nerve compression. This can occur due to prolonged pressure on certain areas of your body, especially if you tend to sleep on your left side or maintain a poor posture while using your computer. The ulnar nerve, for example, can be compressed at the elbow (cubital tunnel syndrome) or wrist (carpal tunnel syndrome), leading to weakness and numbness in the hand and fingers.

2. Muscle Strain: The discomfort in your back and arm could also be a result of muscle strain. If you have been engaging in activities that require repetitive motions or if you have been standing for long periods, the muscles in your back and arms may become fatigued and lead to pain and weakness.

3. Postural Issues: Poor posture, especially while sitting or sleeping, can lead to musculoskeletal problems. If you consistently sleep on your left side or lean in a certain way while using your computer, this can lead to muscle imbalances and strain, causing pain and discomfort in your left side.

4. Injury: You mentioned experiencing pain in your left knee after standing for a long time. This could indicate an overuse injury or strain in the knee joint or surrounding muscles. If the pain persists, it may be worth investigating further.

5. Circulatory Issues: Although less common in young individuals, circulatory problems can also lead to symptoms of weakness and numbness. If blood flow is restricted to certain areas, it can cause these sensations.

Recommendations for Improvement
1. Posture Correction: Focus on maintaining good posture while sitting and sleeping. When using your computer, ensure that your chair and desk are at the right height to avoid straining your neck and back. Consider using a chair that provides good lumbar support.

2. Regular Breaks: If you are studying or using the computer for extended periods, take regular breaks to stretch and change positions. This can help alleviate muscle tension and improve circulation.

3. Strengthening Exercises: Incorporate exercises that strengthen the muscles in your back, shoulders, and arms. This can help improve your overall posture and reduce the risk of injury. Consult with a physical therapist for a tailored exercise program.

4. Stretching: Regular stretching can help relieve muscle tightness and improve flexibility. Focus on stretches that target the neck, shoulders, and back.

5. Ergonomic Adjustments: If you spend a lot of time at a desk, consider investing in ergonomic furniture or accessories, such as a supportive chair, a standing desk, or wrist supports.

6. Consult a Healthcare Professional: If your symptoms persist or worsen, it is crucial to consult a healthcare professional, such as a neurologist or orthopedic specialist. They can conduct a thorough examination and may recommend imaging studies or nerve conduction tests to rule out any serious conditions.

Conclusion
While your symptoms may be related to poor posture and muscle strain, it is essential to monitor them closely. If you experience any sudden changes, such as increased weakness, loss of coordination, or additional symptoms like headaches or dizziness, seek medical attention immediately. Early intervention can help prevent further complications and ensure that you maintain a healthy and active lifestyle.

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