What is Hair Loss:

Hair loss (alopecia) can affect just your scalp or your entire body. It can be the result of heredity, certain medications or an underlying medical condition. Anyone — men, women and children — can experience hair loss.
Baldness typically refers to excessive hair loss from your scalp. Some people prefer to let their baldness run its course untreated and unhidden. Others may cover it up with hairstyles, makeup, hats or scarves. And still others choose one of the medications or surgical procedures that are available to treat hair loss.
Before pursuing any treatment option, talk with your doctor about the cause of and best possible treatments for your particular type of hair loss.
There are many types of hair loss, also called alopecia:

• Involutional alopecia is a natural condition in which the hair gradually thins with age. More hair follicles go into the resting phase, and the remaining hairs become shorter and fewer in number.
  
  
• Androgenic alopecia is a genetic condition that can affect both men and women. Men with this condition, called male pattern baldness, can begin suffering hair loss as early as their teens or early 20s. It's characterized by a receding hairline and gradual disappearance of hair from the crown and frontal scalp. Women with this condition, called female pattern baldness, don't experience noticeable thinning until their 40s or later. Women experience a general thinning over the entire scalp, with the most extensive hair loss at the crown.
  
  
• Alopecia areata often starts suddenly and causes patchy hair loss in children and young adults. This condition may result in complete baldness (alopecia totalis). But in about 90% of people with the condition, the hair returns within a few years.
  
  
• Aloperia Totalis Cause total hairloss of Scalp.
  
  
• Alopecia universalis causes all body hair to fall out, including the eyebrows, eyelashes, and pubic hair.
  
  
• Trichotillomania, seen most frequently in children, is a psychological disorder in which a person pulls out one's own hair.
  
  
• Telogen effluvium is temporary hair thinning over the scalp that occurs because of changes in the growth cycle of hair. A large number of hairs enter the resting phase at the same time, causing hair shedding and subsequent thinning.