Hair Loss

It is normal to shed some hair each day as part of this cycle. However, some people may experience excessive (more than normal) hair loss. Hair loss of this type can affect men, women and children.
Treatment Duration: 3 to 6 months  

Alopecia Areata
Alopecia areata is categorized as an autoimmune skin disease. Hair follicles are mistakenly attacked by an individual’s immune system, which results in the arrest of hair growth. Alopecia areata may initially manifest itself as bald patches on one’s head and can progress to complete loss of scalp hair.
Treatment Duration: Depends upon stage

Dandruff

A person's entire body surface continuously sheds dead skin cells. The skin itself sheds every twenty-four days. Dandruff, the shedding of dead skin cells from the scalp at an excessive rate, is the result of the normal growing process of the skin cells of the scalp.
Treatment Duration: 1 to 2 months

Premature Graying
The hair has a tendency to lose its natural colour with advancing age. It is therefore natural for the hair to turn gray with age. But premature graying is a morbid condition and it makes even the young looks older. This causes a great deal of concern in the affected persons, especially women.
Treatment Duration: 6 to 12 months

Male and Female pattern baldness
Men who have this type of hair loss usually have inherited the trait. Men who start losing their hair at an early age tend to develop more extensive baldness. Women may develop female-pattern baldness. In this form of hair loss, the hair becomes thin over the entire scalp.
Treatment Duration: depends upon stage

Baldness
The term "common baldness" usually means male-pattern baldness, or permanent-pattern baldness. Male-pattern baldness is the most common cause of hair loss in men. Since hair loss may be an early sign of a disease, it is important to find the cause so that it can be treated.
Treatment Duration: depends upon stage

Psoriasis in scalp
Scalp psoriasis is very common. In fact, at least half of all people who have psoriasis have it on their scalp. As with psoriasis elsewhere on the body, skin cells grow too quickly on the scalp and cause red lesions covered with scale to appear.
Treatment Duration: depends upon stage

Chemotherapy related hair fall
Believe it or not, hair loss due to chemotherapy is one of the most distressing side effects of chemo treatments. Hair loss does not occur with all chemotherapy. Whether or not your hair remains as it is, thins or falls out, depends on the drugs and dosages.
Treatment Duration: 3 to 6 months