Numbness is a complete loss of feeling when you touch your skin. It
may feel like the part you touch does not belong to you.
Tingling is a pins-and-needles feeling. Almost everyone has had this
feeling at some time—for example, when your foot "falls asleep." An occasional,
slight tingling that lasts only briefly is not generally cause for
concern.
It is not unusual to wake up in the morning with numbness or tingling
if you sleep on your hand. This may temporarily cut off blood flow to your hand
or put pressure on a nerve. If this is the case, the feeling will come back
within a minute or two. See an illustration of
skin
innervation of the hand
.
Overuse of your hands and wrists may lead to conditions such as
carpal tunnel syndrome and
ulnar
tunnel syndrome. Pressure on a nerve (median or ulnar nerve) in the
wrist causes tingling, numbness, weakness, or pain in the fingers and
hand.
Numbness and tingling are more serious when:
- You have a complete loss of
feeling.
- You have symptoms of decreased blood flow, such as pale,
white, blue, or cold skin.
- You have muscle weakness not caused by
pain.
- Symptoms don't go away.
- Symptoms go away, but
keep coming back.