Male hair loss, or genetic baldness, is the most common type of hair loss among men.
It seems that hormonal factors play a role, especially the male hormone known as dihydrotestosterone (DHT).
Hair loss affects approximately half of all men over 50, and around 50 million men in the United States.
DHT has been linked to hair loss in women, but this article will focus on male baldness.
Quick facts about dihydrotestosterone
Here are some key points about dihydrotestosterone (DHT). More details in the main article.
DHT is an androgen and helps give male masculine characteristics.
It is believed that DHT reduces hair follicles, which contributes to hair loss.
At the age of 50, it is likely that more than half of men in the United States experience hair loss through DHT.
Treatments that prevent DHT can help prevent hair loss.
What is DHT?
Male pattern baldness
Male pattern baldness affects about half of men over 50 in the United States.
DHT has many roles. In addition to hair production, it is associated with high benign prostatic hyperplasia, prostate enlargement and prostate cancer as well.
DHT is a sexual steroid, which means that it is produced in the gonads. It is also an androgenic hormone.
Androgens are responsible for the biological properties of males, including deeper sound, body hair and increased muscle mass. During fetal development, DHT plays a vital role in the development of the penis and the prostate gland.
In men, 5-alpha-reductase (5-AR) converts testosterone to DHT in the testicles and prostate. Up to 10 percent of testosterone is converted to DHT.
DHT is stronger than testosterone. Linked to the same sites as testosterone, but more easily. Once there, they stay connected for longer.
Hair growth and hair loss
Male hair loss is the most common type of hair loss in men. Hair at the temples and in the thin crown and slowly disappear at the end.
The real cause of this is unknown, but it is believed that genetic, hormonal and environmental factors play a role. DHT is believed to be an important factor.
Three stages of hair growth
To understand the pattern of hair loss in men, we must understand hair growth.
Hair growth is divided into three stages: anagen, catagen and telogen:
Anagen is a stage of growth. Hair is maintained at this stage for 2 to 6 years. The longer the period, the more hair will grow. Usually, about 80 to 85 percent of the hair on the head at this stage.
Catagen lasts only two weeks. It allows the hair follicles to regenerate.
Telogen is a resting stage. The bursa remains dormant for 1 to 4 months. Usually, between 12 and 20 percent of the hair in this stage.
After that, Anagen starts again. The hair outside the pores is pushed with new growth and natural umbrellas.