Read below about swelling of one arm, including causes and common questions. Or get a personalized analysis of your swelling of 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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4 Potential Swelling of One Arm Causes

Disclaimer: The article does not replace an evaluation by a physician. Information on this page is provided as an information resource only, and is not to be used or relied on for any diagnostic or treatment purposes.

  1. 1.Bicep Bruise

    A bruise is the damage of the blood vessels that return blood to the heart (the capillaries and veins), which causes pooling of the blood. This explains the blue/purple color of most bruises. Bruises of the bicep are common due to minor injuries.

    Bruises tend to begin healing within one week.

    Rarity:
    Rare
    Top Symptoms:
    constant upper arm pain, recent bicep injury, pain in one bicep, swelling of one arm, upper arm bruise
    Symptoms that always occur with bicep bruise:
    recent bicep injury, constant upper arm pain
    Urgency:
    Self-treatment
  2. 2.Bruised Tricep

    A bruise is the damage of the blood vessels that return blood to the heart (the capillaries and veins), which causes pooling of the blood. This explains the blue/purple color of most bruises. Bruises of the tricep are common, often due to minor injury.

    Bruises tend to begin healing within one week.

    Rarity:
    Rare
    Top Symptoms:
    constant upper arm pain, tricep injury, pain in one tricep, swelling of one arm, upper arm bruise
    Symptoms that always occur with bruised tricep:
    tricep injury, constant upper arm pain
    Urgency:
    Self-treatment

    Swelling of One Arm Checker

    Take a quiz to find out why you’re having swelling of one arm.

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  3. 3.Compartment Syndrome

    Compartment syndrome is a serious condition that involves increased pressure in a muscle compartment. It can lead to muscle and nerve damage and problems with blood flow.

    Prognosis is highly variable after surgery and depends on how rapidly you are treated.

    Rarity:
    Rare
    Top Symptoms:
    arm numbness, hand numbness, foot numbness, pain in one leg, thigh numbness
    Urgency:
    Hospital emergency room
  4. 4.Benign Bony Growth (Osteochondroma)

    An osteochondroma is a non-cancerous growth that usually develops during childhood or adolescence. It is a benign tumor that forms on the surface of a bone near the growth plate.

    Will remain for life if not treated with surgery, but is benign and is not expected to affect life expectancy.

    Rarity:
    Rare
    Top Symptoms:
    lower leg bump, upper leg bump, numbness in one thigh, painful thigh lump, hip bump
    Urgency:
    Primary care doctor

Questions Your Doctor May Ask About Swelling of One Arm

  • Q.About your [upper arm], do you notice:
  • Q.Any fever today or during the last week?
  • Q.About your [forearm], do you notice:
  • Q.About your [shoulder], do you notice any of the following?

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

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Swelling of One Arm Symptom Checker Statistics

  • People who have experienced swelling of one arm have also experienced:

    • 12% Pain in One Arm
    • 7% Pain in the Upper Arm
    • 6% Pain in One Shoulder
  • People who have experienced swelling of one arm had symptoms persist for:

    • 32% Less Than a Week
    • 26% Over a Month
    • 25% Less Than a Day
  • People who have experienced swelling of one arm were most often matched with:

    • 20% Compartment Syndrome
    • 1% Bicep Bruise
  • 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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