12 Less Known Causes of Numbness in Fingertips
Innervation of the fingertips
Common Causes Of Numb and Tingly Fingertips
Examples of well known causes of numbness and tingling in the fingertips:
- Callus, which is thick skin on the fingertips, for example, in guitar or violin players causes decreased sensitivity in the fingertips.
- Hyperventilation due to anxiety or heavy exercise can be associated with transient tingling in the fingers and around the mouth.
- Peripheral neuropathy, for example, in individuals with poorly controlled diabetes mellitus or in chronic alcoholics can cause tingling and numbness in the feet and hands in the stockings-and-gloves pattern.
- Carpal tunnel syndrome due to wrist overuse can include tingling and numbness in the first three fingers; see the green area in the picture.
- Cubital tunnel syndrome can include tingling and numbness in the pinky finger after leaning on the elbows; see the blue area in the picture.
- Cervical radiculopathy, which refers to pinched nerves that arise from the neck spinal cord and supply the arms caused by herniated discs or bony spurs in the neck spine; symptoms may include pain, tingling and numbness in the neck arm, hand and fingers on one or both sides.
- Raynaud's phenomenon refers to color changes (white, blue and red), tingling and numbness in the fingertips after exposure to cold or during stress.
- Frostnip, frostbite, burns or scalds can cause transient or permanent numbness in the fingertips.
- A finger injury with the nerve damage can cause numbness in the fingertip lasting for several weeks.
For a much more comprehensive list of causes check the source on the bottom of the article.
Less Known Causes of Numbness of Fingertips
1. Physical pressure
2. A cut
3. Guyon's canal syndrome
4. Thoracic outlet syndrome
6. Seafood poisoning
9. Metabolic disorders
10. Guiilain-Barre syndrome
11. Fingertip eczema
12. Blue finger syndrome
1. Spray Can Painting
When you spray paint and therefore press on the spray can nozzle for an hour or two without much rest, the fingertip of your index finger can go numb and remain so for several weeks, months or even more than a year. When this happens you can not do much about it, except avoiding pressing with this finger until the sensation comes back.
To avoid using a finger, you can use a spray can with a lever, which you hold with your hand.
2. A Cut of the Digital Nerve
The digital nerves run on either side of all fingers. When you cut the nerve on one side of the finger, the sensation in the affected side distally to the cut may be partially or completely lost. The part of the nerve distally to the cut eventually dies off and the proximal part then regrows into the denervated part at a rate about one millimeter per day.
After simple and shallow cuts, for example, with a kitchen knife, sensation in the finger can recover spontaneously, but after deep or messy cuts, for example, with a saw, surgical repair may be required. Without surgery, a nerve may not heal properly.
3. Guyon's Canal Syndrome
Guyon's canal is a bony space on the palmar and outer side of the wrist (on the side of the pinky finger) through which the ulnar nerve runs. Repeated pressure on the wrist in the Guyon's canal area can result in numbness, tingling and weakness in the pinky finger and the same side of the hand and wrist. This can occur in cyclists (cyclist's palsy), weightlifters, workers with jackhammers or those who use crutches for a prolonged time or have arthritis or ganglion cyst in the wrist.
4. Thoracic Outlet Syndrome
Thoracic outlet is the space between the clavicle, the first rib and local muscles, through which nerves and vessels to the arm run. Compression of these nerves or vessels can cause numbness, tingling and weakness in the arm, hand or the fingertips and, sometimes, swelling and bluish discoloration of the hand and fingers. Causes may include:
- Cervical rib — a congenital anomaly with an additional rib above the normal first rib
- Repetitive arm movements in assembly workers or typists
- Whiplash injury after car or motorbike accidents
- Jobs or sports that involve overhead activity: baseball, swimming, weightlifting, etc.
Large amounts of coffee (at least 6-10 cups) drunk per day can, in some people, result in chronic caffeine intoxication or caffeinism. Tingling in fingertips is probably caused by anxiety associated with increased frequency of breathing, which results in temporary drop of blood calcium levels.
6. Seafood Poisoning
Numbness and tingling in the fingertips, around the mouth and in other parts of the body, itching and diarrhea can be caused by ciguatera poisoning after eating certain big tropical fish, such as tuna and barracuda, by shellfish poisoning or by eating salmon or buffalo fish (Haff disease).
7. Migraine Aura
Some migraineurs experience numbness and tingling in the fingers that travels up to the arm and to the face, followed by headache usually on one side.
Drugs used to treat migraine--ergotamine, methysergide and topiramate--may also cause numbness in the fingertips. Ergotamine overdose may even cause prolonged arterial spasm in the fingers, which may lead to gangrene of the fingertips.
Examples of drugs that may cause numbness and tingling in the fingertips (an incomplete list):
- Antibiotics: nitrofurantoin, norfloxacin
- Antidepressants: phenelzine, trazodone
- Acyclovir (an antiviral drug)
- Levodopa and other drugs for Parkinson's disease
- Diuretics (acetazolamide, metolazone)
- Ethambutol and isoniazid for tuberculosis
- Statins (atorvastatin) to lower blood triglycerides
Illegal drugs: amphetamine, cocaine, ecstasy, glue sniffing, ketamine, nitrous oxide, phencyclidine.
9. Metabolic Disorders
- Hypoglycemia (in treated diabetics after skipped meal or the insulin or oral hypoglycemic drug overdose)
- Hypocalcemia (in hyperventilation, vitamin D deficiency, pancreatitis)
- Hypokalemia (in prolonged starvation, anorexia, vomiting or diarrhea) or hyperkalemia (due to potassium chloride poisoning)
- Hypomagnesemia (after alcohol withdrawal)
- Hyponatremia (in adrenal insufficiency, water intoxication, lung cancer with inappropriate ADH secretion).
Other symptoms of metabolic disorders, beside numbness and tingling, may include nausea, muscle cramps and impaired consciousness.
10. Guillain-Barre Syndrome
Rarely, few weeks after a respiratory infection (common cold, flu) or gastroenteritis, some people may experience sudden onset of numbness and tingling in the toes that progresses toward the feet and knees and numbness in the fingertips that progresses toward the hands and arms. This can be followed by muscle weakness that can affect the whole body including the respiratory muscles.
Symptoms may fully develop within few hours or days and may be life-threatening, so hospitalization is often required. Symptoms usually resolve in several weeks.
11. Fingertip Eczema
Main symptoms of a fingertip eczema are peeling of one or more fingertips on one or both hands followed by numbness, cracks, tenderness, but usually no itch, in the fingertips, and full recovery in 3-4 weeks. The condition tends to repeat on the same or other fingertip soon after healing.
The underlying mechanism may include allergic or irritant contact dermatitis.
Triggers of fingertip eczema may include irritant plants, such as garlic, tulip bulbs, chili pepper; acrylic nails; acrylic materials (used by orthopedic surgeons and dentists), rubber, nickel-plated tools (in car mechanics); prolonged contact with paper or cardboard; water, soaps, disinfectants, shampoos; antibiotics or stress.
12. Blue Finger Syndrome
Some people with a history of Raynaud's phenomenon, frostbite, finger injury, cryoglobulinemia, polycythemia or smoking may experience sudden bluish discoloration and numbness of one or more fingers without apparent reason. The condition is usually benign and resolves spontaneously in few days.
More causes of blue fingers.
Read in detail:
- Causes of Paresthesia in Fingertips
Hypoxia, anemia, diabetes, vasculitis, atherosclerosis, thrombosis, embolism, leprosy, lung diseases, extensive lists of drugs, poisons and other causes of peripheral neuropathy, Raynaud's phenomenon and carpal tunnel syndrome, hammer hand syndrome.