Factors creditworthy for hair problems are:

Thyroid disorders
Hormonal imbalance
Smoking
Anemia
Heavy drugs
Using hair dyeing of high content of ammonium
Vitamin B12 deficiency
Protein deficiency
Hereditary and aging

Rubbing the nail:

Rubbing the left and right hand nails with each other is a powerful technique to treat hair loss and hair growth.
Is a simple but very effective technique. Is a solution to hair loss.
In addition to convenient, fast, powerful and pleasing this technique is reposeful as well as free of cost.
Is a proven technique and will definitely show results.
This is a powerful unified solution of hair problems.

How To:

Bend your palms inwards and place fingernails of both hands against each other. Then with regular speedy movements, rub against each other. Is a simple technique and can be through anywhere at any time.
Rub the nails for 5-10 proceedings twice a day.

Advantages of fingernails rubbing:

Prevent hair loss
Reverse baldness
Prevent hair graying
Restore your natural hair color
It usually takes 3-6 months to get relief from hair loss, 6-9 months to look at the new growth of hair and 9-12 months to see prominent regrowth and substantial increase in the volume of the hair.

Adult stem cells: theory

Adult stem cells ar undifferentiated cells found throughout the body after embryonic development. May make identical copies of themselves for long periods of time and multiply by cell division to replenish dying cells and regenerate discredited tissues for self-renewal and self healing.
Adult stem cells has a unique power to heal itself. Each time a tissue is damaged, adult stem cells are activated to produce new cells that regenerate discredited tissue and revitalize the body.
Adult stem cells ar found primarily in the brain, spinal cord, blood vessel, bone marrow, peripheral blood, dental pulp, skeletal muscles, skin, digestive system, retina, pancreases and corneas.
Stem cells that are located in the bulge of a hair follicle really cause hair growth.
Rubbing the nail stimulates the brain to send chemical signals to adult stem cells, situated near hair follicles are damaged/unproductive.
Adult stem cells migrate to the base of the hair follicle dead/damaged and due to their ability to dive are new hair follicles and revitalise discredited hair follicles.
So nails one rubbing can manipulate adult stem cells into becoming new hair follicles and can accelerate the growth of hair and revitalize damaged hair follicles to venerate the hair loss or baldness.

Reflexology:

On foot it is believed that the stimulation of certain body parts directly affect other parts of the body.
The nerve endings just below the nails ar connected directly to your hair follicles or scalp.
Nail by rubbing together, you activate the blood circulation in the scalp.
So rubbing procedure increases blood flow to the scalp and helps to strengthen hair follicles, which in turn reduces hair loss and untimely greying.

Precautions:

Do not rub your thumbnails because it accelerates the growth of beards, moustaches or facial hair and hair will start soon also peeps from the ears.
Avoid it during pregnancy; rubbing the nail can cause uterine contractions and can elevate blood pressure.
Avoid in it in some conditions such as acute appendicitis and surgical angiography etc.
Are non problematic in skin/nails or if there ar infected sores or lesions on the hands, or brittle nails/sick.
People with the history of high blood pressure should avoid vigorous rubbing nail can raise their blood pressure.
Avoid rubbing, excessive and vigorous as could permanently damage nails.
Before rubbing the nail, you can apply a small amount of castor oil/olive oil almond oil/Vaseline on nails, nail beautiful and strong, supplemental lubrication will diminish the excessive friction during friction, this will make nails stronger, brilliant and hydrated.
Just rub the nails delicately for 5-10 minutes, twice a day for best results.

Article source: http://EzineArticles.com