numbness CT scan preparation

Overview

Numbness is a loss of feeling in a part of your body. It can feel like tingling, pins and needles, or a ‘dead’ limb. A CT scan is a special type of X-ray that creates detailed cross-section images of the inside of your body. When you have numbness, a CT scan can help your doctor check for problems in your brain, spine, or nerves that might be causing it.

CT scans are common imaging tests used to help find the cause of numbness when your doctor suspects a problem in the brain or spine.

Numbness can affect people of any age, but it is more common in older adults. The need for a CT scan depends on your symptoms, medical history, and physical exam.

Symptoms

Common symptoms

• Tingling or a pins-and-needles feeling
• Loss of feeling in an arm, leg, hand, or foot
• Weakness or heaviness in a limb
• A burning, cold, or tight sensation in the affected area

Symptoms in children

• Children may say a body part feels ‘weird’ or ‘asleep’.
• They may have trouble moving the numb area or complain of clumsiness.
• Sometimes a child with numbness may be quiet and not want to play.

Symptoms in older adults

• Older adults may notice numbness with balance problems or falls.
• They might have numbness with weakness when trying to hold objects.
• Older adults may be less likely to notice gradual numbness because they attribute it to aging.

Causes

Main causes

• Poor blood flow to a part of the body
• A pinched or compressed nerve
• Diabetes or other metabolic conditions
• Multiple sclerosis or other nerve disorders
• Vitamin B12 deficiency

Risk factors

• Age over 50 years
• High blood pressure or diabetes
• Smoking
• Prolonged sitting or repetitive movements
• A history of stroke or mini-stroke

When to see a doctor

See a doctor urgently if:

• If you have sudden numbness with weakness, facial drooping, or trouble speaking, call your local emergency number right away.
• If numbness follows a recent head, neck, or back injury, seek urgent medical care.
• If numbness is accompanied by difficulty breathing, chest pain, or fainting, get emergency help.

Book a routine appointment if:

• If numbness lasts more than a few hours or comes and goes over days.
• If numbness is limited to one finger, hand, or foot and does not resolve.
• If you notice numbness affecting your daily activities like walking, writing, or using your hands.

Diagnosis

Your doctor will ask about your symptoms and do a physical exam. If they suspect a problem in the brain or spine, they may recommend a CT scan. For the scan, they will give you specific preparation instructions.

Tests that may be done

• CT scan of the head or spine
• MRI scan for more detailed images of nerves and soft tissues
• Blood tests to check vitamin levels, blood sugar, and signs of inflammation
• Nerve conduction studies or electromyography to check how well your nerves are working

What to expect at your appointment

During a CT scan, you lie still on a table that slides into a tunnel-shaped machine. The scan is painless and usually takes about 15 to 30 minutes. If contrast dye is used, you may feel a warm flush for a few seconds. Tell the technician if you feel anxious or uncomfortable.

Treatment

Treatment for numbness depends on the cause. It may involve managing an underlying condition, physical therapy, or sometimes surgery. Your doctor will create a plan that fits your situation.

Self-care at home

• Move around and change positions regularly if you sit for long periods
• Apply warm compresses to help relax muscles if your doctor says it is safe
• Follow any preparation instructions for your CT scan, such as fasting before the test
• Tell your doctor about all medications and supplements you take before the scan

Medical treatments

Medical care may include medicines to control blood sugar, blood pressure, or inflammation, as well as physical therapy to improve nerve and muscle function. In some cases, vitamin supplements may be recommended by your doctor.

When is surgery considered?

Surgery is sometimes considered if a nerve is physically trapped or a structural problem such as a herniated disc is causing the numbness.

Living with this condition

Work with your healthcare team to understand the cause of your numbness and how to manage it. Keep track of your symptoms and note any changes. Simple safety measures, like using handrails or avoiding sharp objects with a numb hand, can help prevent injuries.

Lifestyle tips

• Stay as active as your condition allows
• Avoid smoking and limit alcohol
• Manage stress through deep breathing or mindfulness
• Take breaks when doing repetitive tasks

Diet and exercise

A balanced diet and regular, gentle exercise can help keep your nerves healthy. If you have diabetes or other conditions, following your doctor's advice about diet is especially important.

Mental health and emotional wellbeing

Living with numbness can be frustrating or scary. It can affect your daily activities and mood. It is normal to feel anxious or worried while waiting for test results.

Prevention

Not all causes of numbness can be prevented, but you can reduce your risk by managing conditions like diabetes, keeping blood pressure in a healthy range, avoiding smoking, and staying active.

Complications

If left untreated

• An underlying condition, like a stroke or severe nerve compression, can lead to permanent disability if not treated in time.
• Untreated nerve compression can cause muscle weakness or loss of function.
• A delayed diagnosis can make the underlying condition harder to treat.

Long-term outlook

The outlook depends on the cause. Many causes of numbness improve with treatment and time. For serious conditions, early diagnosis and care can make a big difference.

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