Nerves in the hand and wrist

Anatomy: Nerve supply to the hand and wrist

The movements and sensation of the hand are controlled by three main nerves: median nerve, ulnar nerve and radial nerve. Each of these nerves runs through narrowly defined anatomical tunnels and boxes. In these narrow areas, nerves can become irritated or compressed - sometimes with characteristic symptoms.

• Median nerve: runs through the carpal tunnel in the carpus; ensures, among other things, for feeling in the thumb, index and middle fingers as well as the ball of the thumb.
• Ulnar nerve: passes behind the elbow (cubital tunnel) and at the carpus through Guyon's box; supplies the ring and little fingers as well as parts of the hand muscles.
• Radial nerve: divides on the forearm; its superficial branch (ramus superficialis) conveys feeling to the back of the hand, the deep branch (posterior interosseous nerve) controls parts of the extensor muscles.

Typical narrow areas are the carpal tunnel (medianus), Guyon's box (ulnaris) and the radial tunnel (radialis). In addition, superficial nerve branches can become irritated, for example when wearing tight bracelets or by pressure on the forearm (cheiralgia paresthetica).

Typical symptoms and warning signs

Nerve problems can begin gradually or occur suddenly. There are often nighttime complaints that can be significantly improved with splints. Look out for the following signs:

• Tingling, numbness or “falling asleep” of fingers (with carpal tunnel usually thumb–middle finger; with ulnar nerve more ring and little finger).
• Burning pain, electrifying abnormal sensations, sometimes radiating into the forearm.
• Reduced strength, clumsiness, tendency to drop small objects, tiring grip.
• Nocturnal pain, relieved by shaking out the hands.
• Muscle loss (atrophy) on the ball of the thumb or in the muscles between the fingers over a long period of time.
• Hypersensitivity of the skin, changes in temperature or color (possible in complex pain syndromes).

Warning signs that should be clarified promptly by a doctor: sudden new onset of paralysis, persistent complete numbness of individual fingers, increased pain despite rest, significant paleness/coldness of the hand or severe swelling after an injury.

Causes and risk factors

There is usually a combination of mechanical tightness, tissue swelling and individual stress. Systemic factors can also make the nerves more sensitive.

• Mechanical constrictions: swelling of the tendon sheaths, ergonomically unfavorable hand position, ganglia or scar tissue.
• Repetitive strain: long periods of computer work, vibration activity, crafts, sports with a firm grip (cycling, climbing).
• Anatomical variants: narrow boxes, additional tendons, connective tissue.
• Consequences of fractures or dislocations of the wrist or forearm.
• Concomitant diseases: diabetes mellitus, hypothyroidism, rheumatic diseases, kidney diseases.
• Hormonal changes (e.g. pregnancy), fluid retention.
• Lifestyle and diet: alcohol abuse, vitamin B12 deficiency.
• After operations or injuries: nerve irritation, neuroma formation.

Frequent nerve problems in the hand and wrist

The following clinical pictures occur particularly often. The links provide you with in-depth information on symptoms, diagnostics and therapy.

• Carpal tunnel syndrome: narrowing of the median nerve in the carpal tunnel; Nocturnal tingling of thumb and middle finger, later weakness of the ball of the thumb.
• Cubital tunnel syndrome: ulnar nerve compression at the elbow; Tingling ring/little finger, grip weakness, Froment sign.
• Guyon-Logen syndrome: ulnar artery constriction at the carpus; often when cycling or pressure on the palm of the hand.
• Radial tunnel syndrome: Pain and possible extension weakness due to radial nerve compression on the proximal forearm.
• Cheiralgia paresthetica: irritation of the superficial radial branch; burning pain/sensitivity on the back of the hand.
• Polyneuropathies: diffuse, mostly symmetrical nerve disorders (e.g. in diabetes); not primarily local.
• Complex regional pain syndrome (CRPS): persistent pain, sensory disorders, vegetative changes after trauma/surgery.
• Sensory disorders without a structural cause: functional or central modulation of pain; structured diagnostics are important.

Diagnostics in our practice in Hamburg

Accurate diagnostics are crucial in order to distinguish nerve blockages from blood circulation or joint problems and to choose the appropriate therapy. We combine anamnesis, functional examination and modern imaging – taking into account your everyday life and workload.

• Detailed anamnesis: course, nighttime complaints, triggering activities, previous illnesses.
• Clinical tests: Phalen, Durkan and Tinel signs, 2-point discrimination, force and forceps grip, Froment and Wartenberg signs, radial tunnel provocation tests.
• High-resolution ultrasound (neurosonography): representation of nerve cross-section, sliding behavior, constrictions, ganglia; If necessary, Doppler to differentiate circulatory disorders.
• X-ray/MRI if bony constrictions, masses or complex accompanying findings are suspected.
• ENG/EMG (in cooperation with neurology): Measurement of nerve conduction velocity and muscle activity to objectify the damage.
• Laboratory if systemic causes are suspected (e.g. diabetes, thyroid, vitamin deficiency).

Diagnostics and treatment decisions are evidence-based and individual – with a focus on conservative options as the first choice.

Conservative therapy: exhaust it first

Most nerve constrictions can initially be treated without surgery. The aim is to relieve pressure, calm inflammation and improve the gliding behavior of the nerves.

• Education and ergonomics: neutral position of the wrist, break management, gentle grip techniques.
• Night splints: particularly effective for carpal tunnel; individually adapted and for a limited period of time.
• Physio/occupational therapy: nerve mobilization (neurodynamics) in doses, tendon and soft tissue technique, strengthening and coordination, desensitization in case of hypersensitivity.
• Medication options: short-term non-steroidal anti-inflammatory drugs for pain/inflammation; In the case of neuropathic pain, if necessary, specific analgesics according to the guidelines.
• Targeted injection therapy: in selected cases, cortisone-containing infiltrations (e.g. in carpal tunnel) under ultrasound control; Benefit-risk assessment and information are a prerequisite.
• Treatment of comorbidities: blood sugar control, thyroid and vitamin status (e.g. B12 if deficiency is proven).
• Aids/taping: padding pads, bar ends when cycling, adapted computer mouse/keyboard.

Conservative measures are usually consistently implemented over a few weeks. The follow-up check decides on adjustments - and whether further diagnostics or a different approach is necessary.

Regenerative and complementary procedures – with a sense of proportion

Regenerative therapies such as PRP (platelet-rich plasma) or perineural injections are discussed. Evidence for peripheral nerve congestion is currently limited. If necessary, a supplementary measure can be considered in individual cases - always with transparent information about the benefits, risks and off-label aspects.

• Neuromodulatory procedures (e.g. TENS) can have a supportive effect on neuropathic pain.
• Acupuncture and manual therapy techniques can relieve symptoms, but do not replace cause-directed therapy.
• Vitamin administration only if deficiency is proven; “Prophylactic” high-dose supplementation is not recommended.

When surgery may make sense

Decompression surgery can be considered if conservative measures have been exhausted or relevant functional failures have already occurred. The decision is made individually and based on guidelines.

The operating principles are nerve-sparing decompression (e.g. open or endoscopic carpal tunnel release, ulnar nerve relief), if necessary neurolysis in the event of adhesions or removal of masses. Follow-up treatment with early functional mobilization and gradual increase in load is important. An individual course varies; Blanket promises of healing are not serious.

Self-help and prevention in everyday life

• Place your wrists in a neutral position at night, if necessary with a splint.
• Regular micro-breaks when working on the computer; gentle stretching and relaxation breaks for the forearm and shoulders.
• Ergonomic adjustments: low-height keyboard, vertical mouse, padded palm rest.
• Handlebar grip and sitting position vary when cycling; Pad pressure points.
• keep hands warm; Cold can increase symptoms.
• Keep a stress diary: What improves/worsens symptoms?
• Address risk factors: quitting smoking, balanced diet, stable blood sugar levels.

Adapt work, everyday life and sport sensibly

The goal is to stay active and avoid overexertion. Small changes often have a big impact.

• Use tools with larger handle diameters and non-slip surfaces.
• Carry loads with both hands, limit the amount of time you use the pincer and pointed grip.
• In climbing: choose a route with a lower crimp load; in cycling: handlebar grips/gloves with gel padding.
• Occupational: rotation principle for repetitive tasks, training on hand and body position.
• Return to work: gradual, symptom-driven; Early communication with the employer/company doctor can help.

Special situations: pregnancy, diabetes, after injury

• Pregnancy: Water retention can narrow the carpal tunnel. A temporary splint is often sufficient; This often improves after birth.
• Diabetes/polyneuropathy: increased risk and partially reduced symptoms. Structured diagnostics (including ENG/EMG) make sense.
• After fractures/surgery: Scars and soft tissue swelling can irritate nerves. Early function and occupational therapy support gliding behavior.

Nerve problems vs. blood circulation or spinal problems

Not every tingling sensation is a nerve problem in the hand. A feeling of cold, white discoloration or stress-related pain are more likely to indicate circulatory problems. Radiations from the neck/cervical spine can also be perceived close to hand. The clinical examination helps to separate the causes – and initiate the appropriate treatment.

Your orthopedic contact point in Hamburg-Winterhude

In our practice at Dorotheenstrasse 48, 22301 Hamburg, we offer a structured assessment and predominantly conservative treatment of nerve problems in the hand and wrist - with modern ultrasound diagnostics, everyday therapy planning and close coordination with neurology and hand therapy.

Make an appointment conveniently online via Doctolib or contact us by email. We advise you individually, transparently and evidence-based - without hasty surgical recommendations.

Other areas of hand health

Hand problems often affect several structures at the same time. You will find in-depth overviews of muscles/tendons/ligaments, joints and cartilage, bones, blood circulation, trauma as well as functional and chronic pain diagnoses.