We all lose a certain amount of hair each day - anywhere from 50 to 100 to 125 hairs. True hair loss occurs when these hairs we lose don't grow back, or when the quantity of hair we lose every day exceeds this regular range.
Hair loss can happen consequently of medications, such as chemotherapy remedies or blood thinners, which can damage the telogen hairs, or quit the natural cell division that then produces weakened hair that is susceptible to breaking. High doses of vitamin A may also result in hair loss also. The most typical type of hair loss, nevertheless, is where much more and much more hair follicles enter what's called the resting phase (telogen phase) within the hair growth cycle.
Overall, hair grows continuously from the scalp, however it moves away from the scalp in three phases. Hair isn't all uniformly in one phase. Different parts of the scalp will be in different phases, so at any one time you should have hair follicles in all 3 stages. Generally, most (90%) of the hair will be in the anagen phase, 10 to 14% of the hair will be in the telogen phase, and only 1 to 2% of hair in the catogen phase.
The first phase is the Anagen phase, which is the growth phase. This can last anywhere between 2 and 8 years. A shorter anagen phase will limit how long your hair can grow. Hair cells at the root divide rapidly, which lengthen the hair shaft.
In the next phase, the catagen phase, the outer root of the hair follicle shrinks and attaches to the root of the hair. Hair growth stops here. This phase lasts 1 to 2 weeks.
The telogen phase is the resting phase. This lasts from 5 to 6 weeks in normal hair. Hair doesn't grow in this phase, but it stays firmly rooted in the scalp as long as the follicle stays in a resting phase below it. New growth begins in the finish of the resting phase, and this is when natural hair shedding will occur, as the new growth pushes the old hair out.
In male pattern baldness, much more hairs enter the telogen phase. These effects of this are an increase in hair shedding. Hair gradually becomes thinner and shorter, and within the finish, the hair follicles shut down.