Q. Why does thyroid medicine cause hair loss?
Doctor Answer is medically reviewed by SecondMedic medical review team.
Thyroid medication is typically prescribed to regulate thyroid hormone levels in people with conditions like hypothyroidism or hyperthyroidism. While these medications are crucial for managing thyroid disorders, they can sometimes have side effects, including hair loss.
Hair loss associated with thyroid medication usually occurs in people who are taking medication to treat hypothyroidism (underactive thyroid). This is because when someone has hypothyroidism, their thyroid gland doesn't produce enough thyroid hormone, which can lead to various symptoms, including hair thinning and loss.
When a person with hypothyroidism starts taking thyroid medication, it aims to restore normal thyroid hormone levels in the body. However, as the medication begins to regulate hormone levels, it can sometimes trigger a temporary phase of hair loss called "telogen effluvium." This happens because the body is adjusting to the changes in hormone levels, and during this adjustment period, some hair follicles enter a resting phase prematurely, leading to increased shedding of hair.
It's essential to understand that not everyone experiences hair loss as a side effect of thyroid medication, and for most people, any hair loss is usually temporary. Once the body adjusts to the medication and thyroid hormone levels stabilize, the hair growth cycle typically returns to normal, and the shedding diminishes.
Additionally, hair loss due to thyroid medication tends to occur within the first few months of starting treatment or when there are dosage adjustments. If someone notices significant hair loss after starting thyroid medication, it's crucial to consult their healthcare provider. They may need to adjust the dosage or explore other treatment options to minimize this side effect.
In summary, thyroid medication can cause hair loss as a temporary side effect, particularly when the body is adjusting to changes in hormone levels. However, this side effect is usually temporary, and hair growth typically resumes once the body adapts to the medication. If someone experiences significant hair loss while taking thyroid medication, it's important to discuss it with their healthcare provider to determine the best course of action.
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