SymptomBrain & nerves
Hand Weakness
Hand weakness is reduced strength in the hand, often noticed as a weaker grip, dropping things or trouble with buttons, jars and keys. The most common causes are nerve compression at the wrist or elbow (carpal and cubital tunnel syndrome), a pinched nerve in the neck and arthritis. Sudden weakness of one hand, especially with face or speech changes, can be a stroke and needs an emergency call.
Also called: Weak hand, loss of grip strength, weakness of the hand, reduced hand strength
At a glance
- What it is
- Loss of strength in the hand or grip, sometimes with numbness, clumsiness or muscle wasting.
- Common causes
- Carpal tunnel syndrome, ulnar nerve compression at the elbow, pinched neck nerve, arthritis, tendon problems.
- Serious causes
- Stroke, spinal cord compression, ALS, multiple sclerosis, Guillain-Barre syndrome.
- Key clue
- Which fingers are numb and which movements are weak point to the nerve involved.
- Diagnosis
- Exam, nerve conduction studies and EMG, and imaging of the neck or brain if needed.
- Treatment
- Splints, therapy, steroid injections, surgery for nerve release, or treating the underlying disease.
When to get help
Call 911 or go to the ER
- Sudden weakness or numbness in one hand or arm, especially with face drooping, slurred speech, confusion or vision loss (call 911 or your local emergency number)
- Weakness in both hands after a neck injury, or with leg weakness or loss of bladder control
- Hand weakness spreading quickly up the arms or into the legs over hours to days, or with breathing difficulty
See a doctor within a day or two
- New hand weakness with neck pain shooting down the arm
- Weakness after a cut to the wrist, forearm or fingers
- Inability to straighten the wrist (wrist drop) after sleeping with the arm over a chair or after an arm fracture
- A hand that is weak, cold, pale or blue
Book a routine appointment
- Gradually weakening grip over weeks or months, dropping things, or trouble with fine tasks
- Wasting of the muscle at the base of the thumb or between the thumb and index finger
- Numbness or tingling in the fingers that wakes you at night
- Painful, swollen finger joints with morning stiffness
Usually safe to manage at home
- Mild tiredness of the hand after repetitive use that recovers with rest, without numbness or wasting
What hand weakness feels like
People describe it in different ways:
- A weak grip: struggling to open jars, turn keys or hold a cup
- Dropping things without meaning to
- Clumsiness with buttons, zips, writing or typing
- Fingers that will not spread apart or close fully
- A wrist that flops down and cannot be lifted (wrist drop)
True weakness means the muscles cannot produce normal force. It is different from pain that stops you gripping, and from stiffness. Doctors separate these because the causes are very different.
Common causes of hand weakness
Carpal tunnel syndrome
The most common cause. The median nerve is squeezed at the wrist. You get numbness and tingling in the thumb, index, middle and half of the ring finger, often worse at night, with weakness of the thumb and later wasting at the base of the thumb. See carpal tunnel syndrome.
Ulnar nerve compression
The ulnar nerve is squeezed at the elbow (cubital tunnel syndrome) or less often at the wrist. Numbness affects the little finger and half the ring finger. Weakness shows in spreading the fingers and pinching, and the hand can look bony between the thumb and index finger.
Pinched nerve in the neck
Cervical radiculopathy from a disc bulge or arthritis causes neck pain that radiates down the arm with weakness in a pattern that depends on the nerve root. C8 and T1 root problems weaken the small hand muscles.
Arthritis and tendon problems
Rheumatoid arthritis and osteoarthritis reduce grip by causing pain, swelling and joint deformity. Tendon conditions such as de Quervain's tenosynovitis and trigger finger cause pain and catching rather than true weakness.
Radial nerve palsy
Pressure on the upper arm, for example sleeping with the arm over a chair back ("Saturday night palsy"), or a fracture of the upper arm bone can cause wrist drop.
Other common causes
- Peripheral neuropathy from diabetes, vitamin B12 deficiency or alcohol, usually starting in the feet before the hands
- Thoracic outlet syndrome, compression of nerves or vessels between the collarbone and first rib
- Overuse and aging, which gradually reduce grip strength
Serious causes
| Cause | Clues |
|---|---|
| Stroke or TIA | Sudden onset, often with face or leg weakness, speech or vision problems |
| Spinal cord compression in the neck | Weak, clumsy hands on both sides, unsteady walking, bladder changes |
| Amyotrophic lateral sclerosis (ALS) | Painless, progressive weakness and wasting, often one hand first, with muscle twitching |
| Multiple sclerosis | Episodes of weakness or numbness with vision or balance problems |
| Guillain-Barre syndrome | Rapidly rising weakness and tingling over days, often after an infection |
| Myasthenia gravis | Weakness that worsens with use and improves with rest, often with drooping eyelids or double vision |
| Hereditary neuropathy with liability to pressure palsies | Repeated nerve palsies after minor pressure |
Weakness patterns and what they suggest
| Pattern | Likely source |
|---|---|
| Thumb weakness, numb thumb to ring finger, night symptoms | Median nerve at the wrist |
| Weak finger spreading, numb little finger | Ulnar nerve at the elbow or wrist |
| Wrist drop, numb back of hand | Radial nerve |
| Weakness with neck pain radiating down arm | Nerve root in the neck |
| Both hands, gradually worse, with leg stiffness | Spinal cord in the neck |
| One side of the body, sudden | Brain (stroke) |
| No numbness, wasting and twitching | Motor nerve disease such as ALS |
How doctors find the cause
A doctor will ask when the weakness started, whether it was sudden or gradual, which fingers are numb, and about neck pain, injuries, diabetes, alcohol and family history. The exam tests each hand muscle, reflexes, sensation and signs such as Tinel's sign (tapping over a nerve causes tingling).
Tests may include:
- Nerve conduction studies and electromyography (EMG): measure how well nerves carry signals and whether muscles are receiving them. These are the key tests for carpal tunnel, ulnar neuropathy, radiculopathy and ALS.
- MRI of the neck or brain for suspected nerve root, spinal cord or brain causes.
- Ultrasound of nerves at the wrist or elbow.
- Blood tests: glucose, HbA1c, vitamin B12, thyroid function, inflammatory markers and rheumatoid factor.
- Grip dynamometer: measures grip strength to track change.
Treatment and home care
Treatment depends on the cause:
- Wrist splints at night for carpal tunnel. Avoid leaning on the elbow and keep the elbow straighter at night for cubital tunnel.
- Hand therapy: strengthening, nerve-gliding exercises and adaptive tools such as jar openers and thick-handled pens.
- Steroid injections for carpal tunnel and inflamed tendons.
- Surgery to release a trapped nerve when there is persistent numbness, weakness or wasting. Earlier surgery gives better recovery of strength.
- Treating the disease: blood sugar control, B12 replacement, arthritis medicines, or specialist care for neurological conditions.
- Over-the-counter pain relief for arthritis pain, following the label dose.
Muscle wasting is a sign the nerve has been compressed for a long time, so do not wait for it before getting help.
Frequently asked questions
What causes sudden weakness in one hand?
Sudden weakness in one hand can be a stroke or transient ischemic attack, especially with face, speech or leg symptoms, so call 911 or your local emergency number. Other sudden causes include radial nerve compression after sleeping on the arm, an injury, or a disc pressing on a neck nerve.
Why am I losing grip strength in my hand?
Gradual loss of grip strength is most often due to carpal tunnel syndrome, ulnar nerve compression, a pinched neck nerve or arthritis. Less common causes include peripheral neuropathy and motor neuron disease. Numbness, night symptoms and muscle wasting help a doctor narrow it down.
Can anxiety cause hand weakness?
Anxiety can cause tingling, shakiness and a feeling of weakness, especially during panic with fast breathing. It does not cause measurable weakness or muscle wasting. New weakness should be examined before assuming anxiety is the cause.
Is hand weakness a sign of MS?
It can be. Multiple sclerosis can cause weakness, numbness or clumsiness in a hand, typically developing over days and often with other symptoms such as blurred vision or balance problems. Most hand weakness has other causes, but an MRI can check if MS is suspected.
Which doctor should I see for hand weakness?
Start with your primary care doctor, who can examine you and order nerve tests. You may be referred to a neurologist for nerve or brain causes, a hand surgeon or orthopedic surgeon for nerve compression, or a rheumatologist for arthritis.
Sources
This guide was written from current patient and clinical guidance, including:
- American Stroke Association: Stroke warning signs (BE FAST)
- National Institute of Neurological Disorders and Stroke: Carpal tunnel syndrome
- American Academy of Orthopaedic Surgeons: Cubital tunnel syndrome
- MedlinePlus: Weakness
- NHS: Carpal tunnel syndrome
- American Society for Surgery of the Hand: Nerve compression