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Learn about your numbness in one forearm, including causes and common questions. Or get a personalized analysis of your numbness in one forearm from our A.I. health assistant. At Buoy, we build tools that help you know what’s wrong right now and how to get the right care.

Numbness in One Forearm Checker

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Your Numbness in One Forearm May Also be Known as:
Can't feel left forearm
Can't feel one forearm
Can't feel right forearm
Left forearm is numb
Loss of sensation on left forearm
Loss of sensation on one forearm
Loss of sensation on right forearm
One forearm is numb
Right forearm is numb

Top 10 Numbness in One Forearm Causes

  1. 1.Brachial Plexopathy

    The brachial plexus is a complex nerve network located in the upper chest deep to the collar bone, which supplies the shoulder, arm, forearm, and hand. Damage to the brachial plexus is usually due to mechanical injury or trauma, and can interfere with normal nerve function causing numbness, pain, and/or weakness.

    You should visit your primary care physician to discuss these symptoms. It is likely the doctor will perform a thorough physical exam, and in many cases refer you to a specialist, physical therapist, or both. A professional evaluation is very important, as surgical treatment might be required for a brachial plexus nerve injury.

    Rarity:
    Common
    Top Symptoms:
    pain in one arm, shoulder pain that shoots to the arm, arm weakness, numbness in one arm, shoulder pain
    Urgency:
    Primary care doctor
  2. 2.Ulnar Nerve Entrapment of Elbow

    Ulnar Nerve Entrapment of Elbow is the compression of the ulnar nerve, causing numbness and/or weakness in the hands.

    You should visit your primary care physician. Diagnosis is made by looking at your symptoms and confirmed with a test of the nerves. Treatment depends on severity. If no weakness, splinting and physical therapy. If weakness, surgery to decompress the nerve.

    Rarity:
    Common
    Top Symptoms:
    hand weakness, pain in one hand, numbness in one hand, weakness in one hand, pain in one elbow
    Urgency:
    Primary care doctor
  3. 3.Thoracic Outlet Syndrome

    Thoracic Outlet Syndrome is the compression of the nerves and/or blood vessels that run through the upper chest. It can occur as a result of trauma, surgery, growths in the body, or just randomly.

    You should seek medical care soon to determine whether the compression is of the nerve or the blood vessels. You may need imaging using x-rays, CTs of the blood streams, or MRIs. Treatment depends on the extent of the injury, but usually includes physical therapy. Surgical treatment may be required if a blood vessel is compressed.

    Rarity:
    Rare
    Top Symptoms:
    pain in one shoulder, spontaneous shoulder pain, arm weakness, pain in one shoulder blade, arm numbness
    Urgency:
    Primary care doctor
  4. 4.Normal Occurence of Chest Pain

    Many people experience chest pain and it's not always indicative of a serious issue.

    You most likely have nothing to worry about, particularly if you are otherwise healthy. However, it might be good to call a health care provider to double check. If the pain becomes severe, you have trouble breathing, or have a history of serious heart disease, it would be prudent to call 911.

    Rarity:
    Common
    Top Symptoms:
    chest pain, rib pain
    Symptoms that always occur with normal occurence of chest pain:
    chest pain
    Symptoms that never occur with normal occurence of chest pain:
    being severely ill, shortness of breath, fainting, severe chest pain, crushing chest pain, excessive sweating, nausea or vomiting, fast heart rate in adults, slow heart rate
    Urgency:
    Phone call or in-person visit
  5. 5.Stroke or Tia (Transient Ischemic Attack)

    A stroke is a medical emergency. Strokes happen when blood flow to the brain is stopped.

    You needs to go to the hospital by ambulance or as soon as possible. The longer you wait, the fewer treatment options available and the worse the outcome.

    Rarity:
    Rare
    Top Symptoms:
    being severely ill, new headache, stiff neck, dizziness, vision changes
    Symptoms that never occur with stroke or tia (transient ischemic attack):
    bilateral weakness
    Urgency:
    Emergency medical service

    Numbness in One Forearm Checker

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  6. 6.Acute Costochondritis (Chest Wall Syndrome)

    Costochondritis is an inflammation of the cartilage that connects a rib to the breastbone. Pain caused by costochondritis may mimic that of a heart attack or other heart conditions.

    You can safely treat this condition on your own by taking over-the-counter pain relief medications such as acetaminophen (Tylenol) or ibuprofen (Motrin, Advil). Local heat or ice compress can also improve symptoms.

    Rarity:
    Uncommon
    Top Symptoms:
    rib pain, chest pain that is worse when breathing, chest pain, rib pain when moving, pain when pressing on the chest
    Urgency:
    Phone call or in-person visit
  7. 7.Temporomandibiular Joint (Tmj) Dysfunction Disorder

    The temporomandibular joint (TMJ) is located in front of the ear, and it connects the jaw to the side of the head. Temporomandibular disorder (TMD) is a painful condition which can be caused by excess tension in jaw mucles, faulty alignment between upper and lower teeth, arthritis in the joint, or injury of the jaw or face.

    You should visit your primary care physician. This is a complex condition to treat, because the causes are not always clear. Treatment may include resting the jaw with a soft diet, pain medications, and physical therapy.

    Rarity:
    Common
    Top Symptoms:
    dizziness, history of headaches, pain, restricted movement, and clicking sounds from jaw, pain in the back of the neck, jaw pain
    Symptoms that always occur with temporomandibiular joint (tmj) dysfunction disorder:
    pain, restricted movement, and clicking sounds from jaw
    Urgency:
    Primary care doctor
  8. 8.Brain Tumor or Mass

    A brain lesion can be cancerous or non-cancerous. Nonetheless, they are a potentially serious issue and should be discussed with a physician.

    You should seek care today, since your symptoms indicate that something serious might be going on. In order to diagnose a brain lesion, imaging must be conducted. It is likely you will be sent to a brain specialist.

    Rarity:
    Rare
    Top Symptoms:
    fatigue, headache, nausea, loss of appetite, irritability
    Symptoms that always occur with brain tumor or mass:
    hidden: any focal neuro sign
    Urgency:
    In-person visit
  9. 9.Carotid Artery Dissection

    A carotid artery dissection is the tearing of the walls of the carotid arteries, which deliver blood to the brain from the aorta. This is a medical emergency.

    Call 911 immediately. Diagnosis is done by CT or MRI, and treatment involves anti-clotting medication for at least 3-6 months. Surgery may be necessary for those who can't get this medication.

    Rarity:
    Rare
    Top Symptoms:
    new headache, headache near one temple, numbness on one side of body, steady headache, history of headaches
    Urgency:
    Emergency medical service
  10. 10.Bacterial Pneumonia

    Bacterial pneumonia is the infection of the lungs with bacteria (as opposed to a fungus or a virus).

    You should go see a doctor within the next day since this diagnosis requires a chest X-ray in addition to a doctor's assessment. Treatment with antibiotics is important to keeping the infection under control, which can become dangerous if it spreads or worsens within the lungs.

    Rarity:
    Common
    Top Symptoms:
    fatigue, cough, headache, loss of appetite, shortness of breath
    Symptoms that always occur with bacterial pneumonia:
    cough
    Urgency:
    In-person visit

Questions Your Doctor May Ask About Numbness in One Forearm

  • Q.Is your forearm numbness constant or come-and-go?
  • Q.Any fever today or during the last week?
  • Q.Turn your head toward the side of your body that is hurting. Lift your head up as someone else pushes down on your head. Does this cause greater pain in your upper body? (This is known as Spurling's test.)
  • Q.Have someone feel for your pulse (at the wrist) on the side of your body that hurts. Now, turn your head to that side. Does the pulse go away? (This is known as the Adson's test.)

If you've answered yes to one or more of these questions, check our numbness in one forearm symptom checker.

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Numbness in One Forearm Symptom Checker Statistics

  • People who have experienced numbness in one forearm have also experienced:

    • 11% Pain in One Arm
    • 5% Headache
    • 5% Rib Pain on One Side
  • People who have experienced numbness in one forearm had symptoms persist for:

    • 40% Less Than a Day
    • 22% Over a Month
    • 22% Less Than a Week
  • People who have experienced numbness in one forearm were most often matched with:

    • 26% Brachial Plexopathy
    • 13% Ulnar Nerve Entrapment of Elbow
    • 6% Thoracic Outlet Syndrome
  • Source: Aggregated and anonymized results from visits to the Buoy AI health assistant (check it out by clicking on “Take Quiz”).

Numbness in One Forearm Checker

Take a quiz to find out why you’re having numbness in one forearm.

Take a quiz