Paresthesia

paraesthesiatinglingpins and needlesnumbnessparesthesiasnumbness and tinglingabnormal sensationsparaesthesiaeparasthesiaacroparesthesia
"Tingling" and "Pins and needles" redirect here.wikipedia
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Formication

crawling sensations in the skinhallucinate ants crawling all over her bodyparanoid delusions
The most familiar kind of paresthesia is the sensation known as "pins and needles" or of a limb "falling asleep". A less well-known and uncommon but important paresthesia is formication, the sensation of bugs crawling underneath the skin.
It is one specific form of a set of sensations known as paresthesias, which also include the more common prickling, tingling sensation known as "pins and needles".

Hyperventilation syndrome

hyperventilation
Other causes include conditions such as hyperventilation syndrome and panic attacks.
HVS may present with chest pain and a tingling sensation in the fingertips and around the mouth (paresthesia) and may accompany a panic attack.

Ischemia

ischemicischaemiaischaemic
Reactive hyperaemia, which occurs when blood flow is restored after a period of ischemia, such as on rewarming after a cold episode in patients with Raynaud's disease, may be accompanied by paresthesia.
Clinical manifestations of acute limb ischemia (which can be summarized as the "six P's") include pain, pallor, pulseless, paresthesia, paralysis, and poikilothermia.

Mercury poisoning

mercurymercury toxicitymercury exposure
It can also be a symptom of mercury poisoning.
They may include muscle weakness, poor coordination, numbness in the hands and feet, skin rashes, anxiety, memory problems, trouble speaking, trouble hearing, or trouble seeing.

Panic attack

panic attacksanxiety attackanxiety attacks
Other causes include conditions such as hyperventilation syndrome and panic attacks.
The most common symptoms include trembling, dyspnea (shortness of breath), heart palpitations, chest pain (or chest tightness), hot flashes, cold flashes, burning sensations (particularly in the facial or neck area), sweating, nausea, dizziness (or slight vertigo), light-headedness, hyperventilation, paresthesias (tingling sensations), sensations of choking or smothering, difficulty moving, and derealization.

Carpal tunnel syndrome

carpal tunnelcarpal tunnel injuryCarpal tunnel syndrome (CTS)
Joint conditions such as rheumatoid arthritis, psoriatic arthritis, and carpal tunnel syndrome are common sources of paresthesia.
The main symptoms are pain, numbness and tingling in the thumb, index finger, middle finger and the thumb side of the ring fingers.

Hypothyroidism

hypothyroidhypo-underactive thyroid
Because of this, paresthesia can also be a symptom of vitamin deficiency and malnutrition, as well as metabolic disorders like diabetes, hypothyroidism, and hypoparathyroidism.

Hypoparathyroidism

hypo-idiopathic hypoparathyroidism
Because of this, paresthesia can also be a symptom of vitamin deficiency and malnutrition, as well as metabolic disorders like diabetes, hypothyroidism, and hypoparathyroidism.
As a result, people with hypoparathyroidism can experience paresthesia, an unpleasant tingling sensation around the mouth and in the hands and feet, as well as muscle cramps and severe spasms known as "tetany" that affect the hands and feet.

Multiple sclerosis

MSdisseminated sclerosisMultiple sclerosis (MS)
Chronic paresthesia can sometimes be symptomatic of serious conditions, such as a transient ischemic attack, or autoimmune diseases such as multiple sclerosis or lupus erythematosus.
The specific symptoms are determined by the locations of the lesions within the nervous system, and may include loss of sensitivity or changes in sensation such as tingling, pins and needles or numbness, muscle weakness, blurred vision, very pronounced reflexes, muscle spasms, or difficulty in moving; difficulties with coordination and balance (ataxia); problems with speech or swallowing, visual problems (nystagmus, optic neuritis or double vision), feeling tired, acute or chronic pain, and bladder and bowel difficulties, among others.

Diabetes mellitus

diabetesdiabeticdiabetics
Because of this, paresthesia can also be a symptom of vitamin deficiency and malnutrition, as well as metabolic disorders like diabetes, hypothyroidism, and hypoparathyroidism.
The symptoms can include numbness, tingling, pain, and altered pain sensation, which can lead to damage to the skin.

Whiplash (medicine)

whiplashwhiplash injurywhiplash injuries
Nerves below the head may be compressed where chronic neck and spine problems exist and can be caused by, among other things, muscle cramps that may be a result of clinical anxiety or excessive mental stress, bone disease, poor posture, unsafe heavy lifting practices or physical trauma such as whiplash.
Symptoms reported by sufferers include: pain and aching to the neck and back, referred pain to the shoulders, sensory disturbance (such as pins and needles) to the arms and legs, and headaches.

Peripheral neuropathy

neuropathyneuropathicneuropathies
Another cause of paresthesia may be direct damage to the nerves themselves, i.e., neuropathy, which itself can stem from injury, such as frostbite, or infection, such as Lyme disease, or may be indicative of a current neurological disorder.
As for any neuropathy, the chief symptoms include motor symptoms such as weakness or clumsiness of movement; and sensory symptoms such as unusual or unpleasant sensations such as tingling or burning; reduced ability to feel sensations such as texture or temperature, and impaired balance when standing or walking.

Vitamin deficiency

vitamin deficienciesavitaminosishypovitaminosis
Because of this, paresthesia can also be a symptom of vitamin deficiency and malnutrition, as well as metabolic disorders like diabetes, hypothyroidism, and hypoparathyroidism.
Pantothenic acid (vitamin B5) deficiency causes chronic paresthesia.

Fibromyalgia

fibrositismuscular rheumatismfibromyalgia syndrome
Fibromyalgia
Some people also report restless legs syndrome, bowel or bladder problems, numbness and tingling and sensitivity to noise, lights or temperature.

Shingles

herpes zosterzosterrash
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).
Two to four days before the rash occurs there may be tingling or local pain in the area.

Anxiety

anxiousnervousnessanxieties
Anxiety or panic disorder
Neurological, as headache, paresthesias, vertigo, or presyncope.

Hyperkalemia

high blood potassiumhyperkalaemiahigh blood potassium levels
Hyperkalemia
Occasionally when severe it results in palpitations, muscle pain, muscle weakness, or numbness.

Guillain–Barré syndrome

Guillain-Barre syndromemiller fisher syndromeGuillain-Barré syndrome
Guillain–Barré syndrome (GBS)
The first symptoms of Guillain–Barré syndrome are numbness, tingling, and pain, alone or in combination.

Hydroxy alpha sanshool

Hydroxy alpha sanshool, a component of Sichuan peppers
It is believed to be responsible for the numbing and tingling sensation caused by eating food cooked with Sichuan peppercorns.

Topiramate

Topiramate (Topamax)
Anticonvulsant pharmaceutical drugs, such as topiramate, sultiame, and acetazolamide
Paraesthesia oral

Hypocalcaemia

hypocalcemialow blood calciumcalcium deficiency
Hypocalcemia, and in turn:
Otherwise symptoms may include numbness, muscle spasms, seizures, confusion, or cardiac arrest.

Magnesium deficiency

hypomagnesemiamagnesiumlow blood magnesium
Hypomagnesemia, often as a result of long term proton-pump inhibitor use
Deficiency of magnesium can cause tiredness, generalized weakness, muscle cramps, abnormal heart rhythms, increased irritability of the nervous system with tremors, paresthesias, palpitations, low potassium levels in the blood, hypoparathyroidism which might result in low calcium levels in the blood, chondrocalcinosis, spasticity and tetany, migraines, epileptic seizures, basal ganglia calcifications and in extreme and prolonged cases coma, intellectual disability or death.

Acetazolamide

Anticonvulsant pharmaceutical drugs, such as topiramate, sultiame, and acetazolamide
Common adverse effects of acetazolamide include the following: paraesthesia, fatigue, drowsiness, depression, decreased libido, bitter or metallic taste, nausea, vomiting, abdominal cramps, diarrhea, black feces, polyuria, kidney stones, metabolic acidosis and electrolyte changes (hypokalemia, hyponatremia).

Sphingolipidoses

sphingolipidosisdysfunctional metabolism of sphingolipidssphingolipid diseases
Acroparesthesia is severe pain in the extremities, and may be caused by Fabry disease, a type of sphingolipidosis.