Eyelashes serve as a natural protective barrier for the eyes, shielding them from dust, debris, and other irritants. They also activate the blink reflex, further protecting the eye from harm.
The Eyelash Growth Cycle
Eyelashes, like other body hairs, undergo a continuous growth cycle with three distinct phases. This cycle ensures new lashes constantly replace old ones. Each individual lash operates on its own timeline, preventing all lashes from shedding simultaneously.
The anagen phase is the active growth stage. During this period, the eyelash actively grows from the hair follicle. This phase typically lasts between 30 and 45 days.
The catagen phase is a short transitional period. Lasting about two to three weeks, the eyelash stops growing, and the hair follicle begins to shrink. The lash remains in place, but its connection to the blood supply is cut off.
The telogen phase is the resting and shedding stage. The lash remains in the follicle until it naturally falls out, making way for a new lash. This resting phase can last for 100 days or more, varying among individuals.
Why Eyelashes Might Fall Out Prematurely
While natural shedding is part of the eyelash growth cycle, some factors can cause eyelashes to fall out prematurely. Mechanical stress is a common culprit, often resulting from habits like rubbing the eyes vigorously. Aggressive makeup removal or improper use of an eyelash curler can also lead to premature lash loss by pulling or breaking the hairs.
Certain cosmetic products can also contribute to lash shedding. Allergic reactions to ingredients in mascara, eyelash glues, or some makeup removers may irritate the lash line. Leaving eye makeup on for extended periods, especially overnight, can also harm lashes and accelerate their shedding cycle.
Underlying medical conditions can sometimes manifest as eyelash loss. Thyroid disorders, such as hypothyroidism or hyperthyroidism, can affect hair growth, including eyelashes, due to the role thyroid hormones play in supporting healthy hair. Inflammatory conditions like blepharitis, which involves eyelid inflammation, or autoimmune diseases like alopecia areata, can also lead to lash loss. Less common causes include certain skin conditions, infections, and even some cancer treatments. Nutritional deficiencies, particularly those involving protein or biotin, can also impact overall hair health, potentially leading to eyelash thinning.
Do Eyelashes Grow Back?
In most instances, if the hair follicle remains healthy and undamaged, lost eyelashes will grow back. The regrowth process is a natural part of the body’s continuous renewal cycle. Eyelashes that fall out due to natural shedding typically regrow within about six weeks.
If eyelashes are pulled out or lost due to trauma, the regrowth timeline can vary, often taking two to three months. However, if the follicle itself is damaged, such as from severe injury or certain medical conditions, regrowth may be delayed or, in rare cases, not occur at all. Patience is often necessary during the regrowth period, as each lash progresses through its cycle individually. If eyelash loss is sudden, extensive, accompanied by other symptoms like itching or redness, or if regrowth does not occur after a prolonged period, consulting a healthcare professional is advisable.