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Numbness and tingling sensation on finger are the effects of nervous system (sensory nerves) of human body making the limb of body experience either no-sensation or some sensations with stinging or pricking. One of the live examples of finger numbness is the halting of blood circulation in some specific part of body such as leg, foot, hand, or finger, causing thereby unresponsiveness (numbness), while tingling sensation is the stinging or pricking erupting on the same part of body prior to proper blood circulation. Foot’s “fall asleep” condition can be effective enough in delineating a clear picture in your mind of the numbness and tingling sensation of different parts of body also.

The numbness, associated with nerve sensation, can occur over any part of human body including the leg, foot, hand and finger. Be whatsoever part of body, an interference with proper blood circulation over the limb may trigger numbness and tingling sensation. The numbness and tingling sensation have a mutual relation which can’t be ignored by the individuals. If the numbness occurs on any specific part of your body, such as finger, hand, foot or leg occurs, the tingling has to occur as it causes a pricking experience. Everyone experiences numbness and tingling sensation once in his or her life depending upon the situation which they come across.

How paresthesia is caused?

It may either be a wrong sitting position or random sleeping posture which halts the fresh supply of blood in any particular portion of body causing thereby a feeling of complete deadness. As soon someone comes into normal position or posture, the blood circulation starts flowing naturally. As soon blood starts, the individual is tormented by a stinging or pricking sensation, a condition known as tingling sensation. The numbness and tingling sensation can affect almost all parts of body due to poor supply or no-supply of blood. Apart from blood factor, some other conditions also are responsible for numbness and pricking sensations on the body, such as medicinal side effects and health disorders. The tingling sensation, erupting after the numbness, is a condition, known as paresthesias in medical terminology. There are some additional conditions also with the similar syndromes, such as cold, warmth, burning, itching, and skin crawling.

The hand, leg or finger numbness and tingling sensation are not restricted to the people of certain age or patients of some specific diseases only as the men, women and children of all ages are susceptible to such conditions. But what is remarkable to be noticed regarding the numbness and tingling or prickling sensation is its becoming much harsher on the aging people. The youths affected from numbness and tingling sensation encounter this problem in latter part of their life as the impregnable and dreaded condition embarrassing them extensively. Men and women suffering from diabetes or sugar problem, hypothyroidism, and those who are alcoholic are much susceptible to such quaint problem of numbness and stinging sensation. Those who lack proper nutrients in their body and have a weak immunity also are susceptible to such traumatic condition affecting them.

The problem of limb’s numbness and prickling or tingling sensation is not confined to deficiency of vital substances only as the mental trauma, mental-shock, stress, anxiety and tension also are the conditions causing a problem of body’s numbness and tingling or stinging sensation afterwards. Though numbness in the hands, leg, foot or fingers are associated with poor or no-supply of blood, the numbness on neck and spine are the live examples of psychological trauma or mental stress.

Causes of limb’s numbness and tingling sensation

It is the disturbance or interference in the natural function of nerve cells (aka neurons) affecting the nerve sensation. All the sensation is transported to the brain through neurons via spinal cord or a vertebra which, if affected or interfered by any condition, fails to send the signal to human brain, causing in this way an experience of numbness. Be it leg, hand, foot or finger, any impact on them can’t be fathomed by the brain as sensation, if the neurons or nerve cells are rendered dysfunctional. There is formed a complex structure inside the spinal cord or vertebrae, due to presence of many other nerve cells, directly attached with human brain. As has already been mentioned that interference with the neurons or central nervous system renders the human brain unresponsive to all the effects on external parts of body, there emerges a numbness followed by tingling sensation. 

Overall nervous system or the structure of spinal cord seemingly getting dysfunctional is denoted as paresthesias, a condition of numbness and stinging in the body. Paresthesia is also known as ischemia, a condition caused by compression of artery of human body. Someone falling deep into slumber with his hands above head is much susceptible to ischemia which may cause hand or finger numbness followed by tingling sensation. It is the compression of some specific limbs such as hand, leg, foot or finger which causes numbness and tingling sensation to the individual. The numbness and tingling sensation are the fugacious conditions as with the individual adopting his normal position, the blood supply is restored and the problem vanishes on its own.

A most critical cause of numbness and tingling sensation is carrying a heavy airbag loading it on back with the support of shoulder. The nerves, attached somehow with shoulder, encounter an impact and trauma of paresthesia or numbness and tingling sensation accrues. There are some syndromes, related with the paresthesia (numbness and stinging sensation), such as entrapment syndromes and carpal tunnel syndrome. Carpal tunnel syndrome affects the individuals when median nerve encounters a pressure on the wrist. Non-stop vibration or compression on wrist develops a swelling on the nerve cells which erupts numbness followed by finger tingling or stinging sensation. The old patients suffering from chronic spinal disease or radiculopathy also may experience hands, leg or finger numbness and tingling sensation.