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

Your Weakness in One Forearm May Also be Known as:
Can't move my left forearm
Can't move my one forearm
Can't move my right forearm
Hard to move left forearm
Hard to move one forearm
Hard to move right forearm
Inability to move left forearm
Inability to move one forearm
Inability to move right forearm
Left forearm weakness

Top 3 Weakness in One Forearm Causes

  1. 1.Rotator Cuff Tendonitis

    Impingement syndrome is a common shoulder condition seen in aging adults. The tendons of rotator cuff muscles, whose action is to rotate the arm such such as during a tennis swing, pass in a narrow space between two bones in the shoulder. When the space becomes too narrow, which can happen as a result of an overuse injury, pain may develop as the tendons rub against the bones.

    You should visit your primary care physician who will coordinate care with a muscle and bone specialist (orthopedic surgeon). Treatments for impingement syndrome involve rest, over-the-counter pain medication, steroid injections, physical therapy, and surgery in rare, serious cases.

    Rarity:
    Common
    Top Symptoms:
    pain in one shoulder, dull, achy shoulder pain, shoulder pain that gets worse at night, difficulty moving the shoulder, shoulder pain from overuse
    Symptoms that always occur with rotator cuff tendonitis:
    pain in one shoulder
    Urgency:
    Primary care doctor

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  2. 2.Tennis Elbow (Lateral Epicondylitis)

    Lateral epicondylitis (tennis elbow) is soreness or pain on the outside of the upper arm near the elbow.

    You can safely treat this condition on your own by resting your arm for 2-3 weeks and avoid the activity that causes your symptoms. You may also put ice on the outside of your elbow 2-3 times a day and take a pain reliever, such as ibuprofen (Advil), naproxen (Aleve) or aspirin, as needed. Contact your physician if home treatment does not relieve the pain.

    Rarity:
    Common
    Top Symptoms:
    elbow pain, pain in one elbow, hand weakness, pain in the thumb side of the elbow, elbow pain from overuse
    Symptoms that always occur with tennis elbow (lateral epicondylitis):
    elbow pain
    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.

    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

Questions Your Doctor May Ask About Weakness in One Forearm

  • Q.How long has your forearm weakness been going on?
  • Q.Is your forearm weakness constant or come-and-go?
  • Q.Did you just suffer from a high impact injury (e.g., a fall or car accident)?
  • Q.About your [forearm], do you notice:

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

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Weakness in One Forearm Symptom Checker Statistics

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

    • 24% Pain in One Shoulder
    • 10% Pain in One Arm
    • 8% Weakness in One Hand
  • People who have experienced weakness in one forearm had symptoms persist for:

    • 49% Over a Month
    • 24% Less Than a Day
    • 11% Less Than a Week
  • People who have experienced weakness in one forearm were most often matched with:

    • 17% Ulnar Nerve Entrapment of Elbow
    • 8% Rotator Cuff Tendonitis
    • 8% Tennis Elbow (Lateral Epicondylitis)

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