Difficulty Moving Arm

Overview

Difficulty moving the arm means it is hard to raise, lift, rotate, or control the arm normally. The limitation may be due to pain that blocks movement, stiffness in the joint, weakness of the muscles, or a problem with the nerves that signal the muscles. The trouble can affect the whole arm or just part of it, such as reaching overhead or behind the back.

Smooth arm movement depends on a healthy shoulder joint, intact muscles and tendons, and working nerves running from the neck down the arm. A problem at any of these points can limit motion. Because some causes are minor while others, such as a stroke, are emergencies, the way the difficulty begins and what comes with it are important clues.

Common Causes

Trouble moving the arm can come from the joint, the muscles and tendons, or the nerves. Common causes include:

• Frozen shoulder: Frozen shoulder causes stiffness and a marked loss of shoulder motion that builds up over weeks.
• Rotator cuff problems: A rotator cuff tear or tendinitis makes lifting and rotating painful and weak.
• Joint conditions: Arthritis or bursitis in the shoulder can limit and stiffen movement.
• Injury: A fall, dislocation, or fracture can suddenly prevent arm movement.
• Nerve problems: A pinched nerve in the neck or injury to the nerves of the arm can cause weakness and limited control.
• Stroke: A stroke can cause sudden one-sided arm weakness and is a medical emergency.

Pain anywhere along the arm can also cause a person to limit movement to avoid discomfort.

Associated Symptoms

Symptoms accompanying difficulty moving the arm help suggest the cause:

• Shoulder pain or arm pain, especially with lifting or reaching
• Stiffness that is worst in the morning or after rest
• Arm weakness or a heavy, dead feeling in the limb
• Numbness or tingling running down the arm with nerve causes
• Swelling, bruising, or visible deformity after an injury

Sudden weakness on one side of the body, drooping of the face, or trouble speaking points to a stroke and requires emergency action.

Diagnosis & Evaluation

A clinician will ask how the difficulty started, whether there was an injury, and what makes it better or worse. The exam tests how far the arm moves, its strength, and the sensation and reflexes. Tests may include:

• X-rays to look for fractures, dislocation, or arthritis
• Ultrasound or MRI to assess tendons, the rotator cuff, or soft tissues
• Nerve studies if a pinched or injured nerve is suspected
• Urgent brain imaging if a stroke is a concern

The history and exam usually narrow the cause quickly, separating joint and tendon problems from nerve or central causes.

Treatment & Management

Treatment depends on the cause and ranges from simple self-care to specialist care.

• Rest and gentle movement: For strains and mild tendinitis, short rest followed by gradual, guided movement helps recovery.
• Physical therapy: Stretching and strengthening exercises are central to frozen shoulder, rotator cuff problems, and arthritis.
• Pain control: Ice, heat, and over-the-counter pain relievers can ease discomfort that limits movement.
• Injections or surgery: Steroid injections or, in some cases, surgery may be considered for stubborn or structural problems such as a significant tear.
• Treat nerve or stroke causes: These require specific medical treatment and rehabilitation.

Most joint and tendon causes improve steadily with the right exercises and time, though full recovery from frozen shoulder can take many months.

When to See a Doctor

See a doctor if arm movement is limited for more than a couple of weeks, follows an injury, or comes with significant pain or weakness. Call emergency services immediately if difficulty moving the arm comes on suddenly with any of these stroke warning signs:

• Weakness or drooping on one side of the face or body
• Sudden numbness of the arm, especially with leg or face involvement
• Trouble speaking, confusion, or difficulty understanding others
• Sudden severe headache, loss of balance, or vision changes

Also seek urgent care for a visibly deformed, severely painful, or numb arm after trauma, which may indicate a fracture or dislocation.

Related Topics

Frequently Asked Questions

References

1. Mayo Clinic. Frozen shoulder — Symptoms and causes.
2. MedlinePlus, U.S. National Library of Medicine. Shoulder pain.
3. American Academy of Orthopaedic Surgeons (OrthoInfo). Rotator Cuff Tears.
4. American Stroke Association. Stroke Warning Signs and Symptoms.