Hair loss during cancer treatment is a common and often emotional experience. However, for many individuals, hair regrowth is a normal and expected part of recovery, with hair often beginning to return once treatment concludes.
Understanding Hair Loss and Expected Regrowth
Hair loss during cancer treatment occurs because therapies like chemotherapy target rapidly dividing cells, including those in hair follicles. This damage can lead to hair falling out, affecting not just the scalp but also other body hair, including eyelashes, eyebrows, and pubic hair. Radiation therapy can also cause hair loss, though it is limited to the specific area treated, such as scalp hair loss from head radiation.
The hair loss typically begins two to four weeks after starting chemotherapy and can continue throughout treatment and for a few weeks afterward. While hair loss is a common side effect, regrowth is a normal part of recovery. Hair often starts to grow back once treatment finishes, sometimes even before.
Factors Affecting Hair Regrowth
Hair regrowth is influenced by several factors, including the specific type of cancer treatment received. Chemotherapy drugs vary in their likelihood and severity of causing hair loss, with some leading to complete hair loss while others cause only thinning. The dosage, combination of medications, and duration of treatment all play a role in how much hair is lost and how quickly it regrows. Individual biological differences and overall health also contribute to each person’s unique regrowth experience.
While most chemotherapy-induced hair loss is temporary, certain treatments carry a risk of long-term or permanent changes. High doses of specific chemotherapy drugs, or combinations like taxane and anthracycline, may increase the likelihood of more persistent hair loss. Additionally, hormonal therapies can cause hair thinning, which is usually mild and can last as long as the treatment continues.
The Regrowth Journey: What to Expect
Hair regrowth typically begins weeks to months after chemotherapy completion. Many individuals observe the first signs of new hair, often as a soft fuzz, within three to six weeks after treatment ends. Within two to three months, hair may reach about an inch in length, and by three to six months, it can grow two to three inches, often providing enough coverage to address bald patches. A full covering of hair is usually seen within three to six months for most individuals.
A common and often surprising aspect of the regrowth journey is a change in hair texture or color, sometimes referred to as “chemo curls.” Hair that was previously straight might grow back curlier, or vice versa. The new hair may also be a different shade, either darker or lighter than before, and can feel finer or more brittle. These changes are generally temporary, with hair often returning to its original texture and color within several months to a year as the body recovers. However, the initial regrowth can sometimes be patchy or uneven.
Caring for Regrowing Hair
Caring for regrowing hair requires a gentle approach to support its health and strength. New hair growth is particularly fragile, and the scalp may remain sensitive after treatment. Using mild, gentle shampoos and conditioners is beneficial, and washing the hair as needed, rather than daily, can help maintain scalp health. When drying hair, pat it gently with a soft towel or microfiber turban instead of rubbing vigorously.
Minimizing exposure to harsh chemicals and heat styling is also important during this period. Avoid hair dyes, perms, or chemical relaxers for several months after treatment to prevent damage to delicate new strands and potential irritation. Limit heat styling tools like blow dryers, curling irons, and straighteners to protect fragile hair from breakage. Protecting the scalp from sun exposure with hats or scarves is also advisable, as it may be more sensitive. Patience is a significant factor in the regrowth process, as it can take time for hair to regain its pre-treatment length, thickness, and texture.