Hair loss is a complex process and there are many potential causes in the background.
Medical conditions, medications, stress are all known causes of hair loss.
But the vast majority of men experience androgen alopecia, or male pattern baldness to some extent over their lives.
In the case of male pattern hair loss, there are 3 major factors at play:
Genetics and hormones
Androgenetic alopecia only occurs in men with a specific genetic code in their chromosomes.
The specific gene or group of genes causing androgenetic hair loss are still unidentified, though experts believe they’re involved in synthesising male hormones — enzyme 5-alpha reductase (which converts testosterone into dihydrotestosterone or DHT) and androgen receptors found within hair follicles.
But simply carrying the gene is no guarantee of baldness.
The gene must be “expressed” to be activated, which hinges on numerous factors including age, stress levels, hormones, and more.
The genes and hormones covered in the previous section are not enough to cause androgenetic hair loss instantly.
This process takes time, during which any follicles susceptible become exposed to the problematic male hormones.
How much time does this demand?
Length varies from one person to another.