when patients with Raynaud's disease rewarm after a cold episode. Reactive hyperaemia, which occurs when blood flow is restored after a period of ischemia, may be accompanied by paresthesia, e.g. Most pressure-induced paraesthesia results from awkward posture, such as engaging in cross-legged sitting for prolonged periods of time. Removing the pressure typically results in gradual relief of these paresthesias. Other common examples occur when sustained pressure has been applied over a nerve, inhibiting or stimulating its function. The varicella zoster virus ( shingles) also notably may cause recurring pain and tingling in skin or tissue along the distribution path of that nerve (most commonly in the skin, along a dermatome pattern, but sometimes feeling like a headache, chest or abdominal pain, or pelvic pain). A cold sore outside the mouth (not a canker sore inside the mouth) can be preceded by tingling due to activity of the causative herpes simplex virus. Other causes include conditions such as hyperventilation syndrome and panic attacks. The most common everyday cause is temporary restriction of nerve impulses to an area of nerves, commonly caused by leaning or resting on parts of the body such as the legs (often followed by a pins and needles tingling sensation). In the older age group, spinal column irregularities may tweak the spinal cord briefly when the head or back is turned, flexed, or extended into brief uncommon positions ( Lhermitte's sign). a pinched neck nerve may cause a brief shock-like paresthesia toward the scalp). Similar brief shocks can be experienced when any other nerve is tweaked (e.g. The briefest electric shock type of paresthesia can be caused by tweaking the ulnar nerve near the elbow this phenomenon is colloquially known as bumping one's "funny bone". Paresthesias of the hands, feet, legs, and arms are common transient symptoms. A less well-known and uncommon paresthesia is formication, the sensation of insects crawling on the skin. The most familiar kind of paresthesia is the sensation known as " pins and needles" after having a limb "fall asleep". Paresthesias are usually painless and can occur anywhere on the body, but most commonly occur in the arms and legs. Paresthesia may be transient or chronic, and may have many possible underlying causes. Paresthesia is an abnormal sensation of the skin (tingling, pricking, chilling, burning, numbness) with no apparent physical cause.
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