The observation that hair seems to shed more during the fall months often leads to concern about underlying hair loss conditions. This phenomenon, which can result in more hair collecting in the shower drain or on a brush, is a real biological occurrence for many people. The increased shedding is typically a temporary adjustment by the body to changing environmental conditions, rather than a sign of a permanent issue. This temporary increase in shedding is often referred to as seasonal effluvium.
Understanding the Hair Growth Cycle
Hair growth follows a continuous cycle involving four distinct phases: Anagen, Catagen, Telogen, and Exogen. The Anagen phase is the longest growth stage, lasting for several years, with 85% to 90% of a person’s hair typically in this active state at any time.
The Catagen phase is a brief transition period where the hair follicle shrinks and growth ceases, usually lasting only a few weeks. Following this is the Telogen phase, a resting period lasting about three months, where the old hair is held in the follicle.
The final stage, the Exogen phase, is the active shedding of the old hair shaft, allowing the follicle to begin a new Anagen growth phase. The daily loss of 50 to 100 hairs is considered a normal part of this continuous cycle.
The Biological Basis of Autumn Shedding
The increase in hair shedding observed in the fall is directly linked to a synchronized shift in the hair cycle known as seasonal effluvium. Research indicates that a higher number of hair follicles enter the Telogen (resting) phase during the summer months. This shift is thought to be an evolutionary adaptation, where denser hair growth in summer provided a natural barrier to protect the scalp from intense ultraviolet radiation.
Because the Telogen phase lasts for approximately three months, the hair follicles that entered this resting state in July will naturally be pushed out and shed in October and November. This results in a noticeable peak of hair loss during the autumn season. Changing light levels and the decrease in daylight hours may also influence the production of certain hormones, which can indirectly impact the hair cycle, further contributing to this synchronization.
How Long Seasonal Shedding Lasts
Seasonal hair shedding is a temporary condition that typically resolves itself without intervention. The duration of this increased shedding usually lasts between six to eight weeks, although some individuals may notice it for up to three months. If the shedding is seasonal, it should gradually taper off and return to the normal daily rate.
While you cannot stop this natural cycle, you can support hair health during the transition period with gentle care. Avoid tight hairstyles that pull on the hair follicles and minimize the use of high-heat styling tools, which can cause unnecessary stress and breakage. Focus on a balanced diet rich in protein, iron, and B vitamins to ensure the new hair has the necessary building blocks for healthy regrowth. Incorporating a gentle scalp massage can also help stimulate blood circulation to the follicles.
Recognizing When Hair Loss is Not Seasonal
It is important to distinguish between the temporary increase of seasonal shedding and a more chronic or pathological form of hair loss. Seasonal shedding is characterized by a general increase in hair fall across the entire scalp, without bald patches or significant changes in hair density that last long-term.
The shedding is considered non-seasonal and warrants professional consultation if it persists for longer than three months or is accompanied by other physical symptoms. Signs such as a widening part, a receding hairline, or the appearance of distinct, circular bald spots may indicate conditions like pattern baldness or alopecia areata. Furthermore, if the hair loss is accompanied by scalp irritation, pain, itching, or systemic symptoms, consulting a dermatologist or physician is advisable to rule out underlying medical issues or nutritional deficiencies.