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This inherited characteristic is apparently only found in males.
It affects the skin on the crown causing hair thinning in and around the crown creating a certain pattern. Normally this fault results due to failure of follicles to produce regular hair roots. The weak hair roots cause the growth of thin hair which eventually falls off leaving a clear field, hence baldness.
The present follicle weakens further and can no longer support production of new hair. Different study units have shown that male pattern baldness is more of a genetic factor, with other claiming a portion of non-genetic links but none has been proved as yet. However, different theories try to argue the reasons for male pattern baldness linking it to sex hormones, diet and atmospheric pollution. Nevertheless, these theories have not fully been supported by any philosophical ground.
Diagnosis and remedial Male pattern baldness (refer to PubMed Health) is easy to diagnose.
It starts by shrinking of the hairline that eventually recedes forming an M shape on the crown. Almost simultaneously, the hair around the hairline covering the crown starts getting thinner and weaker, and slowly starts disappearing resulting to a more prominent M shape on the crown. The hair transplant expert will diagnose male pattern baldness after closely looking at the condition of the hairs, the scalp and most importantly, the shape of the hair line.
Generally, doctors will recognize this pattern after looking at your crown without having to perform any tests. If this situation becomes more of a bother to the extend you cant put up with it, there is a medical remedy and a qualified practitioner will be well placed to address the matter, thanks to modern technologies like micro-grafting; consider your worries a thing of the past. This micro level grafting technique uses the grafts from the back of your head where hairs are thick and dense.
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From: (male pattern baldness) http://yourhairgrowingsolution473.wordpress.com/2012/03/20/dealing-with-male-pattern-baldness/