Noticing strands of hair on clothing, in a brush, or collected in the shower drain is common. Some daily hair shedding is a natural and expected part of the body’s processes, indicating a healthy hair growth cycle.
The Natural Cycle of Hair Growth
Hair growth occurs in a continuous cycle with distinct phases. The anagen, or growth, phase is the longest, where hair follicles actively produce new hair for several years. Following this is the catagen phase, a brief transitional period where hair growth slows and the hair follicle shrinks.
The telogen phase is a resting period, lasting a few months, where hair remains attached but doesn’t grow. At its end, the hair naturally detaches and falls out, making way for new hair to begin its anagen phase. On average, individuals shed between 50 and 100 hairs daily as part of this ongoing cycle, a number that is generally unnoticeable given the approximately 100,000 hair follicles on the scalp.
Distinguishing Normal Shedding from Excessive Hair Loss
Distinguishing normal hair shedding from excessive hair loss is important for scalp health. Normal shedding is a consistent, low level of hair release that typically goes unnoticed. If you notice a significant increase in the amount of hair left in your brush, in the shower, or on your pillow, this could signal excessive shedding.
Observing visible changes to your hair’s appearance, such as a widening part line, overall thinning, or the emergence of bald patches, also suggests more than routine shedding. A pull test can indicate excessive shedding: gently run your fingers through a small section of clean, dry hair. If more than a few strands come out with a gentle tug, it suggests excessive shedding. These persistent observations point to a departure from typical hair turnover.
Everyday Factors Influencing Hair Shedding
Several common factors can influence hair shedding, often temporarily increasing the amount you notice. Physical or emotional stress can disrupt the hair growth cycle, prematurely pushing follicles into the resting (telogen) phase. This typically results in noticeable shedding a few months after a stressful event. Stress hormones like cortisol can also play a role, influencing hair follicle stem cells and extending the resting phase.
Dietary habits also affect hair health. Deficiencies in certain nutrients can impact hair structure and growth. Insufficient protein, for instance, can lead to weaker hair. Inadequate iron or specific vitamins can also cause increased hair fall.
Hormonal shifts are another common cause of increased hair shedding, particularly in women. Postpartum hair shedding occurs due to the sudden drop in estrogen after childbirth. Menopause also involves fluctuating hormone levels, including decreased estrogen and progesterone, which can contribute to hair thinning and shedding.
Certain hair care practices can also contribute to shedding by causing breakage rather than true hair loss from the root. Harsh styling, excessive heat, or tight hairstyles can weaken strands. Chemical treatments can also damage hair. Additionally, some medications can list hair shedding as a side effect.
When to Consult a Professional
While some hair shedding is normal, certain signs indicate seeking professional medical advice. You should consult a healthcare provider if you experience sudden or severe hair loss, where large clumps of hair are coming out or bald patches appear quickly. Persistent shedding that does not subside after lifestyle adjustments or the resolution of a stressful event also warrants evaluation.
Additional symptoms accompanying hair loss, such as scalp itching, pain, redness, or scaling, are important indicators to discuss with a doctor. These could point to an underlying scalp condition or other medical issues. Initially, consulting a general practitioner is a good first step, as they can assess your overall health and may then refer you to a dermatologist for diagnosis and treatment.