Why Are My Hands and Feet Numb & How to Know If It’s Serious

A hand or foot going numb after sitting in one position may not seem concerning. But what if the tingling keeps returning, your fingers feel unusually dull, or both feet start to feel numb?

Numbness in hands and feet can have many causes. Sometimes it is temporary pressure on a nerve. At other times, it can be linked to diabetes, vitamin deficiencies, nerve compression or other neurological conditions. Knowing when the symptom needs medical attention can help you avoid unnecessary worry while also preventing important problems from being overlooked.

What does numbness in the hands and feet mean?

Numbness means reduced or altered sensation in part of the body. You may feel as though your hand or foot has "fallen asleep", or notice tingling, burning, pins and needles or reduced sensitivity.

These symptoms occur when nerves are compressed, irritated or damaged. Peripheral neuropathy, for example, commonly affects the feet and legs and can also involve the hands and arms.

The pattern matters. Numbness affecting both feet gradually, for example, may suggest a different cause from sudden numbness affecting one side of the body.

Common causes of numbness in hands and feet

Not every episode of numbness indicates a serious disease. Some common causes include:

1. Pressure on a nerve: Sitting with your legs crossed for a long time or sleeping with your arm in an awkward position can temporarily compress a nerve. The sensation usually improves once the pressure is relieved.

Nerve compression can also happen repeatedly. For example, carpal tunnel syndrome can cause tingling or numbness in the hand and fingers because of compression of the median nerve at the wrist.

2. Diabetes and nerve damage: Diabetes is an important cause of peripheral neuropathy. Persistently high blood glucose can damage nerves over time, often beginning in the feet and sometimes affecting the hands.

You may notice:

• Tingling or burning in the feet
• Numbness in the toes or fingers
• Reduced ability to feel temperature or pain
• Pain or sensitivity to touch
• Balance problems

People with diabetes should pay particular attention to changes in sensation because reduced feeling in the feet can make it easier to miss cuts, blisters or other injuries.

3. Vitamin B12 deficiency: Vitamin B12 is important for normal nerve function. A deficiency can cause neurological symptoms, including tingling, numbness and weakness. If numbness has no obvious explanation, a doctor may consider blood tests to check for nutritional deficiencies and other possible causes.

4. Nerve compression in the neck or back: Problems involving the spine can irritate or compress nerves travelling to the arms or legs. A nerve affected in the neck may cause symptoms in one arm or hand, sometimes together with neck pain. Similarly, nerve irritation in the lower back can cause symptoms extending into the leg or foot.

5. Other medical conditions: Nerve symptoms can also occur with thyroid disorders, certain infections, alcohol-related nerve damage, some medicines and autoimmune or other neurological conditions. You can't determine the exact cause from numbness alone. A medical review is particularly useful if symptoms persist, keep returning, or gradually worsen.

When is numbness in the hands serious?

Occasional numbness that disappears quickly after changing position is usually less concerning. However, persistent or recurrent numbness should not simply be ignored, particularly if it is accompanied by weakness, pain, balance problems or loss of sensation.

Seek urgent medical attention if numbness develops suddenly, especially when it affects one side of the body.

Sudden numbness with stroke symptoms

Sudden numbness of the face, arm or leg, particularly on one side, can be a sign of stroke. Other warning signs include:

• Facial drooping
• Sudden weakness in an arm or leg
• Difficulty speaking or understanding speech
• Sudden vision problems
• Loss of balance or coordination
• A sudden severe headache

The WHO stroke fact sheet recommends treating suspected stroke as a medical emergency because rapid assessment and treatment are important. Do not wait for these symptoms to settle on their own. Seek emergency medical care immediately.

What about left hand numbness?

Left hand numbness can have several explanations, including nerve compression, cervical spine problems, carpal tunnel syndrome or other nerve conditions. The location alone does not tell you the cause.

However, if numbness in the left hand occurs together with chest discomfort or pain, shortness of breath, sweating, nausea, dizziness or discomfort spreading to the arm, shoulder, jaw or back, seek emergency medical care.

The WHO information on cardiovascular disease describes arm or shoulder discomfort among possible symptoms of a heart attack and notes that symptoms can also include breathing difficulty, nausea, light-headedness and cold sweating.

What can cause tingling in hands?

Tingling in hands can be caused by temporary pressure on a nerve, but repeated symptoms deserve attention.

The pattern can provide useful clues:

• Thumb, index and middle fingers: may occur with median nerve compression, such as carpal tunnel syndrome.
• Little finger and ring finger: may be associated with ulnar nerve irritation.
• Hand and arm with neck pain: may suggest a nerve problem originating in the neck.
• Both hands and feet: may occur with peripheral neuropathy or certain metabolic or nutritional problems.

These patterns are clues, not a diagnosis. A doctor needs to consider your symptoms, medical history and examination before deciding what tests are appropriate.

How is numbness diagnosed?

A doctor may first ask:

• When did the numbness begin?
• Is it constant or does it come and go?
• Is one side or both sides affected?
• Which fingers, toes, hands or feet are involved?
• Do you have pain, weakness or balance problems?
• Do you have diabetes or another long-term condition?
• Are you taking any medicines or supplements?

A neurological examination can assess sensation, muscle strength, reflexes and coordination. Depending on the symptoms, doctors may recommend blood tests, nerve conduction studies, electromyography or imaging. Common initial investigations may include blood glucose, vitamin B12 and thyroid testing when appropriate.

How is numbness treated?

Treatment depends on the underlying cause. For example, management may involve:

• Improving blood glucose control when diabetes is contributing to nerve damage
• Treating a vitamin deficiency
• Addressing nerve compression
• Managing an underlying thyroid or other medical condition
• Using medicines for nerve-related pain when prescribed
• Physiotherapy or other rehabilitation when appropriate

When should you see a neurologist?

Consider consulting a neurologist if numbness:

• Persists or repeatedly returns
• Is gradually spreading
• Is associated with muscle weakness
• Causes difficulty walking or maintaining balance
• Is accompanied by unexplained burning or nerve pain
• Has no obvious cause
• Is affecting your daily activities

A neuro hospital or neurology hospital may provide access to neurological evaluation and investigations when specialist assessment is needed.

How PB Health can support you

At PB Health Hospital, IFFCO Chowk, Gurugram, a doctor can assess your symptoms, medical history and examination findings to understand what may be causing the numbness. If a neurological problem is suspected, you may be guided towards appropriate specialist evaluation and investigations.

The aim is not just to manage the tingling or numbness, but to identify the underlying cause and address it appropriately.

Key takeaway

Numbness in the hands or feet can be temporary, but persistent or unexplained symptoms deserve attention. Diabetes, nerve compression, vitamin deficiencies and other medical conditions can all affect sensation.

Sudden numbness, especially on one side of the body or together with weakness, speech difficulty, facial drooping, chest discomfort or breathing difficulty, requires urgent medical attention.