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Understanding Left Arm Numbness : Causes, Symptoms, and Treatment Options

Exploring Left Arm Numbness

Left arm numbness can arise from various factors, ranging from sleeping positions or minor injuries to potential indicators of severe health issues like heart attacks or strokes, demanding immediate medical attention.(1)

The sensation of numbness in the left arm, similar to its occurrence in the right arm, can be due to many potential causes, ranging from benign origins like sleeping postures to critical health conditions such as heart attacks or strokes. Exploring the root cause behind the numbness is essential for proper evaluation and necessary intervention.

Left Arm Numbness Due to Vascular Issues

Numbness in your left arm can usually be attributed to poor circulation, a condition that disrupts the blood flow to the arms due to various vascular disorders that affect the arteries and veins.(2) These disorders are more prevalent in individuals with certain health conditions such as diabetes, high blood pressure, and kidney failure.

The presence of numbness in your left arm might accompany many other discomforting symptoms. Alongside the loss of sensation, you may also experience some tingling sensations, pain, swelling, abnormal coloring of the fingertips, and a persistent feeling of coldness in the fingers and hands.

Treatment for left arm numbness is contingent on its underlying cause identified through diagnostic assessments. The approach may include various strategies, including using pressure wraps to help boost circulation or more invasive interventions like surgical procedures that try to repair or address the affected blood vessels.(3) Remember that seeking prompt medical evaluation and diagnosis is important to determine the precise cause and allow appropriate treatment for the management of numb arms due to vascular issues.

Left Arm Numbness Due to Peripheral Neuropathy

Peripheral neuropathy, another condition that is sometimes characterized by arm numbness, signifies potential damage within the peripheral nervous system. The condition is accompanied by various other symptoms apart from the sensory disruptions in the arms.(4)

Some of the symptoms of peripheral neuropathy include:(5)

  • Numbness in Arms: Arm numbness serves as a prominent symptom of this condition, often accompanied by tingling or burning sensations and muscle weakness.(6)
  • Abnormal Reactions to Touch: People may experience abnormal responses to touch, indicating compromised nerve function.
  • Severe Symptoms: In more severe cases, symptoms might escalate to muscle wasting, paralysis in the affected area, or dysfunction of internal organs.

It is important to keep in mind that peripheral neuropathy can be caused by a host of different factors such as infections, diabetes, deficiencies in hormones or vitamins, or exposure to toxins, which all ultimately contribute to nerve damage.

Peripheral neuropathy can be treatment in the following ways:

  • Addressing the Underlying Causes: Tailoring treatment based on the identified cause plays a pivotal role in managing peripheral neuropathy and its associated arm numbness. Resolving the underlying condition can often alleviate the symptoms.
  • Natural Remedies: Some natural remedies, while not universally applicable, may aid in managing symptoms. These include supplement intake, applying warmth, or considering alternative therapies like acupuncture.

Understanding the underlying cause of peripheral neuropathy is fundamental in devising an effective treatment plan. Targeted interventions that address the root cause, along with effective symptom management strategies, are essential in alleviating the effects of nerve damage and restoring nerve function. Seeking professional medical advice for accurate diagnosis and personalized treatment recommendations is important for those who are experiencing arm numbness due to peripheral neuropathy.

Left Arm Numbness Due to Cervical Spinal Stenosis

Cervical spinal stenosis, a condition characterized by the narrowing of the spinal canal in the neck region, is often associated with cervical spondylotic myelopathy, potentially leading to various symptoms impacting arm function and beyond.(7)

The narrowing of the spinal canal can result in numbness, tingling sensations, and weakness in the arms. Additionally, it may affect other areas like the feet, urinary bladder, and bowel, leading to dysfunction in these regions.

Treatment of cervical spinal stenosis may involve medications aimed at managing symptoms such as pain or inflammation associated with cervical spinal stenosis.(8)

In severe cases or when conservative treatments fail to provide relief, surgery might be considered to alleviate pressure on the spinal cord and nerves. This surgical procedure aims to widen the spinal canal and relieve compression on the affected nerves.(9)

The treatment plan for cervical spinal stenosis depends on the severity of symptoms and your specific condition. Seeking medical evaluation and professional guidance is important to determine the most suitable treatment strategy for cervical spinal stenosis-associated arm numbness and any other related symptoms.

Left Arm Numbness Due to a Heart Attack

Arm numbness can also serve as a critical symptom that signals a potential heart attack in some people. This is often accompanied by some other distinctive signs that require immediate attention.

Some of the major symptoms of heart attack include:(10)

  • Numbness in the arm: Numbness in the arm can be a noteworthy indicator of a heart attack, especially when experienced alongside other symptoms.
  • Chest Pain and Pressure: Chest pain or a sensation of pressure is a hallmark sign of a heart attack, often described as tightness, squeezing, or discomfort in the chest.
  • Pain in Jaw, Back, or Arms: Pain radiating to the jaw, back, or either arm is a prevalent symptom, commonly associated with a heart attack.
  • Shortness of Breath: Difficulty breathing or shortness of breath, often accompanying chest discomfort, is another significant warning sign.
  • Dizziness, Nausea, or Vomiting: Feelings of dizziness, along with nausea or vomiting, might also occur in conjunction with other heart attack symptoms.

A heart attack is a life-threatening emergency that requires immediate medical attention. If experiencing symptoms indicative of a heart attack, it is crucial to promptly call 911 or seek emergency medical services without delay.

Left Arm Numbness Due to a Stroke

A stroke happens due to a disruption in the blood supply to a part of the brain, leading to the rapid death of brain cells. Identifying specific symptoms is important in seeking urgent medical assistance for proper intervention.

Symptoms of stroke include:

  • One-Sided Body Symptoms: Stroke symptoms commonly affect one side of the body and may manifest as numbness in an arm, leg, or the lower face.(11)
  • Additional Symptoms: Apart from limb numbness, symptoms of a stroke can include speech problems, confusion, sudden headache, vomiting, dizziness, and difficulties with balance and coordination.

Recognizing the signs of a stroke and seeking immediate medical care is crucial. A stroke is a medical emergency that demands urgent treatment to minimize brain damage and prevent complications.

Left Arm Numbness Due to Herniated Disc in the Neck

A herniated disc in the neck can produce various symptoms that affect arm sensation and beyond.

Symptoms of a neck herniated disc include:

Arm Numbness, Weakness, and Tingling: Individuals may experience numbness, weakness, and a tingling sensation in one arm due to the herniated disc’s impact on nerve function.

Radiating Pain: The condition may cause radiating pain, affecting the arm, neck, or shoulders, stemming from the affected area in the neck.

Treatment options include:

  • Rest: Initially, resting the affected area can alleviate discomfort associated with a herniated disc and facilitate the body’s natural healing process.
  • Applying Hot and Cold Compresses: Applying hot and cold compresses alternately can help alleviate pain and inflammation in the affected region.
  • Over-the-Counter (OTC) Pain Relievers: Non-prescription pain relievers might assist in managing mild to moderate discomfort associated with the herniated disc.

A doctor may suggest prescription medications or, in severe cases where conservative measures are ineffective, even recommend surgical interventions to address the herniated disc.


While numbness in the left arm shares many causes that can equally affect the right arm, it is important to recognize that persistent or severe numbness, accompanied by potential pain and tingling, warrants attention. While the numbness itself might not pose an immediate threat, it could signify an underlying serious condition.

Seeking medical advice for persistent or severe numbness is crucial. A doctor can help identify the potential causes and also recommend suitable solutions to address the issue. Moreover, it is important to remember that left arm numbness, especially when accompanied by facial changes, could signify a heart attack or stroke, both requiring immediate medical attention.

Recognizing the significance of arm numbness, understanding its potential underlying causes, and promptly seeking medical evaluation when concerning symptoms arise are key steps in ensuring timely intervention and appropriate care.


  1. Zamir, M.A. and Raoof, J., 2019. Tingling and numbness in the arm. BMJ: British Medical Journal (Online), 366.
  2. www.assh.org. (n.d.). Vascular Disease: Symptoms & Treatment | The Hand Society. [online] Available at: https://www.assh.org/handcare/condition/vascular-disease.
  3. Chang, A., Behrend, C. and Vaccaro, A.R., 2016. Arm Pain, Weakness and Numbness. Differential Diagnosis in Spine Surgery, p.33.
  4. Martyn, C.N. and Hughes, R., 1997. Epidemiology of peripheral neuropathy. Journal of neurology, neurosurgery, and psychiatry, 62(4), p.310.
  5. McLeod, J.G., 1995. Investigation of peripheral neuropathy. Journal of neurology, neurosurgery, and psychiatry, 58(3), p.274.
  6. Latov, N., 2006. Peripheral Neuropathy: When the Numbness, Weakness and Pain Won’t Stop. Demos Medical Publishing.
  7. Raja, A., Hoang, S., Patel, P. and Mesfin, F.B., 2017. Spinal stenosis.
  8. Meyer, F., Börm, W. and Thomé, C., 2008. Degenerative cervical spinal stenosis: current strategies in diagnosis and treatment. Deutsches Ärzteblatt International, 105(20), p.366.
  9. Melancia, J.L., Francisco, A.F. and Antunes, J.L., 2014. Spinal stenosis. Handbook of clinical neurology, 119, pp.541-549.
  10. Shugan, A., 2021. A Case Study on Differential Diagnosis of Episodic Left Arm Numbness. The Neurodiagnostic Journal, 61(4), pp.196-202.
  11. Fisher, C.M., 1965. Pure sensory stroke involving face, arm, and leg. Neurology, 15(1), pp.76-76.
Pramod Kerkar, M.D., FFARCSI, DA
Pramod Kerkar, M.D., FFARCSI, DA
Written, Edited or Reviewed By: Pramod Kerkar, M.D., FFARCSI, DA Pain Assist Inc. This article does not provide medical advice. See disclaimer
Last Modified On:December 28, 2023

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