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Learn about your forearm bruise, including causes and common questions. Or get a personalized analysis of your forearm bruise 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.

Forearm Bruise Checker

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Your Forearm Bruise May Also be Known as:
Arm bruising
Arm is bruised
Bruise on arm
Bruise on forearm
Bruised arm
Bruised forearm
Forearm bruising
Forearm is bruised

Top 10 Forearm Bruise Causes

  1. 1.Mononucleosis Infection

    EBV Mononucleosis is a clinical syndrome characterized by fever, sore throat, and swollen lymph nodes.

    You should visit your primary care physician within the next 24 hours. Diagnosis is confirmed by looking for antibodies against EBV. Treatment involves supportive care (hydration, antipyretics, and analgesics, such as acetaminophen and ibuprofen). Aspirin should not be given to children because of the possibility of Reye syndrome. It is also recommended that you do not do any strenuous physical activity and contact sports in the initial 3 to 4 weeks of illness due to the potential for splenic rupture.

    Rarity:
    Rare
    Top Symptoms:
    fatigue, headache, loss of appetite, abdominal pain (stomach ache), cough
    Symptoms that never occur with mononucleosis infection:
    rectal bleeding
    Urgency:
    Primary care doctor
  2. 2.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.

    Early diagnosis and treatment are important to prevent permanent nerve damage. Your doctor will diagnose carpal tunnel syndrome with a physical exam and special nerve tests. Treatment includes resting your hand, splints, pain and anti-inflammatory medicines. If symptoms do not improve with these less invasive treatments, your physician may recommend surgery.

    Rarity:
    Common
    Top Symptoms:
    spontaneous shoulder pain, hand weakness, wrist pain, pain in one hand, weakness in one hand
    Urgency:
    Primary care doctor
  3. 3.Cellulitis

    Cellulitis is an infection of the skin and tissues underneath it. It is most commonly caused by Group A strep and typically enters the body through a break in the skin.

    You should go to your primary care doctor tomorrow. There, he or she will inspect your skin and determine if antibiotics are necessary.

    Rarity:
    Uncommon
    Top Symptoms:
    fever, forearm redness, forearm pain, painful forearm swelling, forearm injury
    Symptoms that always occur with cellulitis:
    forearm redness
    Urgency:
    Primary care doctor
  4. 4.Repetitive Strain Injury of the Hand

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

    You do not need treatment, just rest from your overuse. Wearing a brace and physical therapy might be helpful.

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

    Influenza, or Flu, is an infection of the airway caused by the flu virus, which passes through the air and enters the body through the nose or mouth. The symptoms are similar to those of a cold, but the flu is usually more serious.

    If your flu-like symptoms are existing for less than 48 hours, it might be helpful to seek care by telephone or in a walk-in-clinic to get a course of oseltamivir (Tamiflu). Most people will get better on their own by drinking lots of fluids and taking an over-the-counter medication such as acetominophen (Tylenol) to help with aches or fever.

    Rarity:
    Common
    Top Symptoms:
    fatigue, headache, loss of appetite, cough, muscle aches
    Symptoms that never occur with influenza:
    headache resulting from a head injury
    Urgency:
    Phone call or in-person visit

    Forearm Bruise Checker

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  6. 6.Forearm Wart

    Warts are non-serious skin growths caused by a virus that infects the top layer of the skin. They are contagious.

    You can try several over-the-counter treatments, including salicylic acid and cryotherapy (freezing). Most warts go away on their own, but less so in adults.

    Rarity:
    Common
    Top Symptoms:
    skin-colored forearm bump, painless forearm lump, small forearm lump, scaly forearm bump
    Urgency:
    Self-treatment
  7. 7.Acute Necrotizing Ulcerative Gingivitis (Anug)

    Acute necrotizing ulcerative gingivitis (ANUG) is a relatively rare infection of the gums. It's also known as "trench mouth", as it was discovered in a large number of soldiers in WWI that were stuck in trenches. The pain caused by ANUG is what makes it different from chronic periodontitis, and it requires treatment by professionals.

    You should go to the nearest dentist as soon as possible, or to an urgent care if one is not open at this hour. There, you will be given antibiotics and mouth wash to relieve the pain. You should definitely see a dentist if you go to an urgent care first. The dentist will remove any dead gum tissue to promote healing and help reduce pain.

    Rarity:
    Rare
    Top Symptoms:
    bleeding gums, chronically bad breath, gum pain, severe mouth pain, gum redness
    Urgency:
    In-person visit
  8. 8.Non - Specific Forearm Pain

    Forearm pain can be caused by a host of things, but is often idiopathic (without cause).

    Your forearm pain is normal and unlikely to be caused by a serious illness. You can try over the counter pain medication like Tylenol. If the pain becomes severe, see a physician.

    Rarity:
    Uncommon
    Top Symptoms:
    pain in one forearm, spontaneous forearm pain
    Symptoms that always occur with non-specific forearm pain:
    spontaneous forearm pain, pain in one forearm
    Urgency:
    Self-treatment
  9. 9.Buckle Fracture of Distal Radius

    A buckle fracture of the wrist, also known as a torus fracture, is a condition that are most common in children aged 5-10 years due to the elasticity of their bones. This fracture occurs when force is applied to the radius (one of the two bones of the forearm), causing the bone to split along the growth plate.

    You should visit your primary care physician within the next 24 hours. The treatment for this kind of fracture is immobilization in a cast.

    Rarity:
    Common
    Top Symptoms:
    constant forearm pain, pain in one forearm, forearm pain from an injury, wrist injury, swollen forearm
    Symptoms that always occur with buckle fracture of distal radius:
    forearm pain from an injury, constant forearm pain
    Urgency:
    Primary care doctor
  10. 10.Skin Cyst

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

    You do not need treatment for this condition because it is completely benign; however, if the lesion changes at all, a doctor should be consulted. If you would like it removed, a doctor can cut out the cyst.

    Rarity:
    Common
    Top Symptoms:
    skin-colored forearm bump, marble sized forearm lump, small forearm lump
    Symptoms that always occur with skin cyst:
    skin-colored forearm bump
    Urgency:
    Wait and watch

Questions Your Doctor May Ask About Forearm Bruise

  • Q.Is the bruising on your forearm constant or come-and-go?
  • Q.About your [forearm], do you notice:
  • Q.Any fever today or during the last week?
  • Q.How would you explain your forearm pain?

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

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Forearm Bruise Symptom Checker Statistics

  • People who have experienced forearm bruise have also experienced:

    • 16% Forearm Pain
    • 8% Knee Bruise
    • 8% Fatigue
  • People who have experienced forearm bruise had symptoms persist for:

    • 31% Less Than a Week
    • 18% One to Two Weeks
    • 18% Over a Month
  • People who have experienced forearm bruise were most often matched with:

    • 11% Mononucleosis Infection
    • 11% Carpal Tunnel Syndrome
    • 11% Cellulitis
  • Source: Aggregated and anonymized results from visits to the Buoy AI health assistant (check it out by clicking on “Take Quiz”).

Forearm Bruise Checker

Take a quiz to find out why you’re having forearm bruise.

Take a quiz