Pregnancy can have a significant impact on various aspects of a woman’s body. While the anticipated physical changes such as a growing belly, morning sickness, breast swelling, and skin alterations are well-known, the effects of pregnancy on hair can often catch women off guard. Pregnancy hormones can lead to both desirable and undesirable changes in hair growth. Our hair goes through different stages of growth throughout our lives, and pregnancy exerts one of the most profound influences on this cycle.
Hair Growth Cycle
Understanding the hair growth cycle is essential to comprehend how pregnancy can impact it. Typically, around 90 percent of a person’s total hair is in the growth phase at any given time. The hair on your scalp grows for several years, while the hair on your arms, legs, and face only grows for approximately 100 days. This is why the hair on your head tends to be longer than your eyebrows or eyelashes. Following the growth phase, which lasts about two to four weeks, the hair root separates, leading to the eventual shedding of the hair. Subsequently, the hair follicle produces a new hair, and the cycle begins anew.
Hair Growth Phases
The process of hair growth can be divided into three distinct phases, each with its own characteristics. These phases are influenced by hormonal changes, particularly the fluctuation of estrogen levels during pregnancy and postpartum.
The first phase is known as the anagen phase, which is the active growth phase. During this phase, hair follicles are actively producing new strands of hair, resulting in visible growth. This phase is strongly influenced by hormonal factors, such as the rise in estrogen levels during pregnancy, which often leads to lustrous and thick hair.
The second phase is called the catagen phase, which is a transitional phase. In this phase, hair growth stops, and the hair follicles begin to shrink. This phase is relatively short and marks the end of active growth. The duration of the catagen phase can vary from person to person, but it generally lasts for a few weeks.
The final phase is the telogen phase, which is a resting period for the hair follicles. During this phase, the hair is no longer growing, and it remains in the follicle until it is pushed out by the growth of a new hair strand. This phase is also influenced by hormonal changes, particularly the return to normal estrogen levels after childbirth. It is during this phase that hair shedding may occur, leading to hair loss or thinning.
Understanding these different phases of hair growth can help explain the changes in hair quality and quantity that individuals may experience throughout their lives. Hormonal fluctuations, such as those during pregnancy and postpartum, can have a significant impact on the hair growth cycle and should be taken into consideration when addressing hair-related concerns.