Which factors can cause increased hair growth?

Increased hair growth can be influenced by a variety of factors, with one significant contributor being hormonal changes. The correct choice highlights factors such as sun exposure, stress, tweezing, and the use of aspirin.

Sun exposure can lead to skin irritation or injury, which may trigger a healing response in the body that can, in some cases, enhance hair growth in affected areas. Stress is known to impact hormonal balances in the body, potentially leading to increased hair growth or changes in hair texture. Additionally, tweezing can stimulate the hair follicles, resulting in a denser regrowth of hair as the body responds to the trauma of hair being pulled out. Aspirin, being a blood thinner, can improve blood flow to hair follicles, though its direct effects on hair growth can vary among individuals.

While other options may suggest factors that could contribute to hair growth, they lack the direct association or mechanism provided by the combination of sun, stress, tweezing, and aspirin. Thus, this choice encapsulates broader influences that are more immediately connected to changes in hair growth patterns.