Pins and needles is a nerve waking up, being squeezed, or being irritated. Which fingers are involved tells you WHICH nerve, and where along its length the trouble is.
Three nerves supply the hand. They divide it up neatly, and the borders are surprisingly precise.
The three-territory map
- Median nerve. Thumb, index, middle, and the thumb-side half of the ring finger. Palm side mainly
- Ulnar nerve. Little finger and the other half of the ring finger. Front and back
- Radial nerve. Back of the hand on the thumb side, and the web space between thumb and index. Never the fingertips of the palm
That split down the middle of the ring finger is the giveaway. No other structure in the body divides a single finger in half. If half your ring finger tingles and the other half doesn’t, you are dealing with a nerve, full stop.
Full detail in the nerve map of the hand.
Then work out where along the nerve
Knowing the nerve is half the job. The same nerve can be pinched in several places, and the treatment is completely different depending on which.
- Median at the wrist — carpal tunnel, worse at night, relieved by shaking
- Median at the forearm — pronator teres syndrome, with forearm ache and palm involvement, and usually no night waking
- Ulnar at the elbow — cubital tunnel, includes the back of the hand
- Ulnar at the wrist — Guyon’s canal, spares the back of the hand. Cyclists get this
- Radial at the wrist — Wartenberg’s syndrome, often from a tight watch strap or handcuffs
The back-of-the-hand question is the single most useful one in the whole assessment.
That skin is supplied by a branch that leaves the ulnar nerve before the wrist — so if the back of your hand tingles, the problem is above the wrist.
Which fingers tells you which nerve. What else is involved tells you where.
When it is not the hand at all
- A stripe rather than a patch, running from the neck or shoulder blade down the arm — cervical radiculopathy
- Whole hand, worse with arms overhead — thoracic outlet syndrome
- Both hands and both feet — peripheral neuropathy
- Sudden, one side of the body, with weakness or speech change — that is a medical emergency. Call for help immediately
Why it comes and goes
Nerves tolerate a lot of squeezing before they complain, and they complain intermittently long before they complain constantly.
Intermittent tingling means an irritated nerve. It recovers well.
Constant numbness, especially with weakness or muscle wasting, means a nerve that has been compressed long enough to lose fibres. That recovery is slow, sometimes partial, and it is the reason for not waiting a year to get it looked at.
The line I use in clinic: tingling is a warning light, numbness is the breakdown.
What to do
- Color in a picture of your own hand showing exactly where it tingles. Bring it. It is more useful than any sentence you can construct
- Note whether it wakes you, and whether shaking helps
- Change the position that reproduces it, especially in bed. See hand numbness at night
- Splint at night if it follows the median nerve — see which splint
- Six weeks of consistent effort before you judge whether it worked
Half a ring finger is the most informative symptom in hand medicine, and almost nobody thinks to mention it.
Every article on this site is written using the Closing Window Method: name the window your condition runs on, find where you are in it, and act while it’s still open.