What is Paraesthesia?
Paraesthesia refers to a burning or prickling sensation that is usually felt in the hands, arms, legs, or feet, but can also occur in other parts of the body. The sensation, which happens without warning, is usually painless and described as tingling or numbness, skin crawling, or itching.
Most people have experienced temporary paraesthesia -- a feeling of "pins and needles" -- at some time in their lives when they have sat with legs crossed for too long, or fallen asleep with an arm crooked under their head. It happens when sustained pressure is placed on a nerve. The feeling quickly goes away once the pressure is relieved.
Chronic paraesthesia is often a symptom of an underlying neurological disease or traumatic nerve damage. Paraesthesia can be caused by disorders affecting the central nervous system, such as stroke and transient ischaemic attacks (mini-strokes), multiple sclerosis, transverse myelitis, and encephalitis. A tumour or vascular lesion pressed up against the brain or spinal cord can also cause paraesthesia. Nerve entrapment syndromes, such as carpal tunnel syndrome, can damage peripheral nerves and cause paraesthesia accompanied by pain. Diagnostic evaluation is based on determining the underlying condition causing the paraesthetic sensations. An individual's medical history, physical examination, and laboratory tests are essential for the diagnosis. Physicians may order additional tests depending on the suspected cause of the paraesthesia.