Bosley Hair Transplant
Bosley Hair Transplant

Hair Loss Causes In Men

Causes of Hair Loss in Men

Most causes of hair loss in men can be attributed to one of the following reasons:

• Male pattern baldness (androgenetic alopecia)
• Scarring from accidents, surgery, and chemical and thermal burns
• Hair loss due to hair pulling, such as braiding or weaving
• Heredity (family history of hair loss)
• Medical conditions and medications
• Changes in your hormones

While knowing the cause of your hair loss isn’t going to fix it by itself, recognizing the type of male hair loss you have is the first step in determining your ideal treatment plan.


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As its name implies, male pattern baldness usually exhibits a predictable pattern, with hair loss beginning at the hairline above the temples and gradually receding. Male pattern baldness is also the most common cause of hair loss in men, accounting for more than 95% of all hair loss cases.

Male pattern baldness causes your hair follicles to shrink gradually over time until they stop regrowing. Without proper attention, it can eventually progress to the point where only hair on the sides and rear of the head is left. With timely treatment, this outcome can be prevented.


Much less common than male pattern hair loss is patchy hair loss and spot baldness, also known as alopecia areata. Alopecia areata is actually an autoimmune disease and occurs when your body’s immune system attacks your hair follicles, leaving a smooth, round patch of hairless skin. Patchy hair loss can happen in otherwise healthy people.

Other Hair Loss Factors

Hair loss in men can also be caused by external factors. Some examples include:

  • A traumatic event such as a death in the family
  • Medication to treat cancer, heart problems or high blood pressure


Since male pattern baldness is the most common and predictable form of male hair loss, a visual scale was developed by Dr. James Hamilton (and later updated by Dr. O’Tar Norwood) to help men identify the level of their hair loss. Using the Norwood scale as a guide, you can identify your individual hair loss classification. While Bosley offers hair loss solutions for all stages of hair loss, the sooner you address your hair loss, the greater the chance you can preserve or save your hair.

  • Class 1 represents a head of hair with no visible hair loss.
  • Class 2 is characterized by the beginning of a receding hairline and some recession in the temple region.
  • Class 3 patients exhibit a more significant decline in hair above the temples as well as receding from the forehead. In the Class 3 vertex, hair loss is starting to become significant on the crown.
  • Class 4 hair loss may become more noticeable on the crown or patients may have significant hair loss above the temples and/or forehead.
  • Class 5 hair loss affects the front and back of the scalp, with only a small area of the front hairline remaining and a rather large area of hair loss on the top.
  • Class 6 advanced hair loss occurs when the hair bridging the two sides of the head is fading away or completely gone. There may still be sufficient donor hair for transplantation; however, results may be limited.


You can meet with a Bosley professional to learn about proven options that are available to restore your hair. The free consultation is private, and you can learn about every state-of-the-art hair restoration treatment offered at Bosley.


Bosley Hair Restoration Patient


“I chose Bosley because when you’re losing your hair, it’s on your radar, and if I’m going to get this done I want to get it done right. I wanted to go to the best. I figured Bosley would be the best, and look at these results!”*

– Andrew R., Class 4 (subjective) hair loss classification

*Not all patients can achieve the results described/depicted here. Ask your Bosley physician during your free consultation about your individual case”