Alopecia Underlying Cause
The most common cause for alopecia is male pattern baldness, which can also occur in females.
Additional causes of alopecia include:
- Inflammation of the hair follicles
- Over production of oil in the hair follicle
- Polycystic ovarian disease
- Poor diet
- Radiation therapy
- Scalp infection:
- Traction on the hair strands: tight head wraps and pony tails
Alopecia Non-Scarring Alopecia
Non-scarring alopecia refers to a situation where the hair shafts fall out, but the hair follicles are still alive.
Types of non-scarring alopecia include:
Alopecia Scarring Alopecia
Scarring alopecia is caused by inflammation, scarring, and destruction of hair follicles.
This form of hair loss can accompany other illnesses and tends to be permanent.
Types of scarring alopecia include:
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- Trueb RM; Swiss Trichology Study Group. Finasteride treatment of patterned hair loss in normoandrogenic postmenopausal women. Dermatology. 2004;209(3):202-7. 
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- Wiedemeyer K, Schill WB, Loser C. Diseases on hair follicles leading to hair loss part II: scarring alopecias. Skinmed. 2004 Sep-Oct;3(5):266-9.