Read below about pain in one arm, including causes and common questions. Or get a personalized analysis of your pain in one arm 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.

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A.I. Health Assistant Causes for Pain in One Arm

The list below shows results from the use of our A.I. Health Assistant by Buoy users who experienced pain in one arm. This list does not constitute medical advice.

  1. 1.Brachial Plexopathy (Shoulder Nerve Issue)

    The brachial plexus is a complex nerve network located in the upper chest and shoulder region. Nerves can be explained as 'electric wires' of the body, passing through signals from the brain to the spinal cord and from the spinal cord to the muscles. The brachial plexus is a bundle of nerves that lies deep to the collar bone, which supplies the shoulder, arm, forearm, and hand. When this bundle of nerves is (partially) damaged, one speaks of a 'plexopathy'. Several causes of damage can be injury or forceful trauma, inflammation or infection. A commonly known cause is sports injury in contact sports like football and rugby. Symptoms can include pain, burning, numbness and weakness in the shoulder and arm on one side, sometimes shooting through the arm to the hand. An acute (sports) injury that causes this condition is often called 'burners' or 'stingers' because of the burning and stinging type of pain. When the cause is inflammation of the nerves, it is often called the Parsonage-Turner syndrome.

    The severity of this condition is highly variable, and dependent on the amount of damage caused to the nerves. Brachial plexus injury following surgery usually has a good prognosis. Recovery times range from 2 weeks to 2 years.

    Rarity:
    Uncommon
    Top Symptoms:
    pain in one arm, shoulder pain that shoots to the arm, arm weakness, numbness in one arm, shoulder pain
    Symptoms that never occur with brachial plexopathy (shoulder nerve issue):
    pain in the front middle part of the neck
    Urgency:
    Primary care doctor
  2. 2.Forearm Strain From a Repetitive Injury

    Repetitive strain injury of the forearm is caused by constantly using the wrist.

    Resolves with rest

    Rarity:
    Uncommon
    Top Symptoms:
    forearm numbness, forearm weakness, forearm pain from overuse
    Symptoms that always occur with forearm strain from a repetitive injury:
    forearm pain from overuse
    Symptoms that never occur with forearm strain from a repetitive injury:
    severe forearm pain, forearm injury
    Urgency:
    Self-treatment
  3. 3.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.

    Mild symptoms resolve on their own, severe disease resolves with surgery

    Rarity:
    Common
    Top Symptoms:
    hand weakness, weakness in one hand, numbness in one hand, pain in one elbow, pain in one forearm
    Urgency:
    Primary care doctor
  4. 4.Repetitive Strain Injury of the Upper Arm

    Repetitive strain injury of the upper arm is caused by consistent repetitive use.

    Resolves with rest

    Rarity:
    Uncommon
    Top Symptoms:
    upper arm pain from overuse, upper arm weakness, upper arm numbness
    Symptoms that always occur with repetitive strain injury of the upper arm:
    upper arm pain from overuse
    Symptoms that never occur with repetitive strain injury of the upper arm:
    upper arm injury, severe upper arm pain
    Urgency:
    Self-treatment
  5. 5.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.

    Resolves with treatment (30% relapse)

    Rarity:
    Rare
    Top Symptoms:
    pain in one shoulder, spontaneous shoulder pain, arm weakness, arm numbness, pain in one shoulder blade
    Urgency:
    Primary care doctor

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  6. 6.Skin Abscess

    A skin abscess is an infection of the deeper skin that's typically due to bacteria seen on the skin. Recently, infections are more frequently caused by Staph. Aureus (puts the "staph" in "staph infections"), which is dangerous and requires treatment.

    Good prognosis with treatment

    Rarity:
    Common
    Top Symptoms:
    rash with bumps or blisters, red rash, red skin bump larger than 1/2 cm in diameter, pus-filled rash, rash
    Symptoms that always occur with skin abscess:
    rash with bumps or blisters
    Urgency:
    Primary care doctor
  7. 7.Skin Cyst

    An epidermoid cyst is a closed sac under the skin filled with a cheese-like or oily material. It is caused by trauma or surgery.

    Resolves with treatment

    Rarity:
    Common
    Top Symptoms:
    skin-colored armpit bump, marble sized armpit lump, small armpit lump
    Symptoms that always occur with skin cyst:
    skin-colored armpit bump
    Urgency:
    Wait and watch
  8. 8.Carpal Tunnel Syndrome

    The carpal tunnel is a narrow passageway filled with ligament and bones at the base of your hand. It contains nerve and tendons. Sometimes, thickening from irritated tendons or other swelling narrows the tunnel and causes the nerve to be compressed. Symptoms usually start gradually, and as they worsen, grasping objects can become difficult.

    Recovery time varies depending on treatment.

    Rarity:
    Common
    Top Symptoms:
    spontaneous shoulder pain, hand weakness, wrist pain, weakness in one hand, pain in both hands
    Urgency:
    Primary care doctor
  9. 9.Rheumatoid Arthritis

    Rheumatoid arthritis (RA) is a form of arthritis that causes pain, swelling, stiffness and loss of function in your joints. It can affect any joint but is common in the wrist and fingers. RA is an autoimmune disorder, meaning that it is caused by the immune system incorrectly attacking the joints when it shouldn't.

    RA is a chronic disease which requires lifelong control.

    Rarity:
    Rare
    Top Symptoms:
    fatigue, depressed mood, joint pain, muscle aches, daytime sleepiness
    Urgency:
    Primary care doctor
  10. 10.Deep Vein Thrombosis

    Deep vein thrombosis (DVT) is a blood clot that forms in a vein deep in the body. Most deep vein clots occur in the lower leg or thigh.

    Curable with medication or surgery but may recur.

    Rarity:
    Uncommon
    Top Symptoms:
    fever, thigh pain, upper leg swelling, calf pain, butt pain
    Urgency:
    Hospital emergency room

Questions Your Doctor May Ask About Pain in One Arm

  • Q.Any fever today or during the last week?
  • Q.What is your body mass?
  • Q.Are you experiencing a headache?
  • Q.Have you ever been diagnosed with diabetes?

If you've answered yes to one or more of these questions, try our pain in one arm symptom checker to find out more.

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Pain in One Arm Symptom Checker Statistics

  • People who have experienced pain in one arm have also experienced:

    • 14% Pain in One Shoulder
    • 6% Rib Pain on One Side
    • 4% Rib Pain
  • People who have experienced pain in one arm were most often matched with:

    • 42% Brachial Plexopathy (Shoulder Nerve Issue)
    • 42% Ulnar Nerve Entrapment of Elbow
    • 14% Forearm Strain From a Repetitive Injury
  • Source: Aggregated and anonymized results from visits to the Buoy AI health assistant (check it out by clicking on “Take Quiz”).

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