Typical male pattern baldness involves a receding hairline and thinning around the crown with eventual bald spots. Ultimately, you may have only a horseshoe ring of hair around the sides. In addition to genes, male-pattern baldness seems to require the presence of the male hormone testosterone. Men who do not produce testosterone (because of genetic abnormalities or castration) do not develop this pattern of baldness.
A careful medical history and examination of the hair and scalp are usually enough to diagnose the nature of your hair loss.
Think about it. Two years is a long time for hair to be subjected to the daily wear and tear of the environment, washing, drying, brushing, combing and any chemical processing. Just imagine what a piece of silk or fine fabric would look like after 2 years of constant handling.

Baldness is not usually caused by a disease, but is related to aging, heredity, and testosterone. In addition to the common male and female patterns from a combination of these factors, other possible causes of hair loss, especially if in an unusual pattern, include:
Hormonal changes (for example, thyroid disease, childbirth, or use of the birth control pill)
A serious illness (like a tumor of the ovary or adrenal glands) or fever
Medication such as cancer chemotherapy
Excessive shampooing and blow-drying
Emotional or physical stress
Nervous habits such as continual hair pulling or scalp rubbing
Burns or radiation therapy
Alopecia areata -- bald patches that develop on the scalp, beard, and, possibly, eyebrows. Eyelashes may fall out as well. This is thought to be an immune disorder.
Tinea capitis (ringworm of the scalp)
The right vitamins and minerals play a major role in keeping your hair healthy. Any nutritional deficiencies can lead to thinning hair or even total baldness. It is a well known fact that an under active thyroid can result in frizzy or brittle hair while an overactive thyroid turn hair greasy and limp.
Hair loss from menopause or childbirth often returns to normal 6 months to 2 years later
