Final answer:
Excessive hair growth can be stimulated by hormonal imbalances, such as excessive production of growth hormone by the anterior pituitary or hyperestrogenic states. These can lead to increased body, facial, and axillary hair growth. Conditions like thyroid dysfunction also affect hair growth patterns.
Step-by-step explanation:
Factors Stimulating Excessive Hair Growth
Disturbances that stimulate excessive hair growth are often related to hormonal imbalances and changes. For instance, hormones such as growth hormones and androgens can contribute to increased muscular development and growth of body hair. The anterior pituitary gland could secrete excessive growth hormone, leading to increased hair growth, while hormonal fluctuations also play a role during the follicular phase in the reproductive cycle, where hormones such as LH and FSH stimulate follicle growth.
Hormonal disturbances, like hyperestrogenic states, have been noted to stimulate excessive cell and possibly hair growth. Acne, a condition involving the sebaceous glands, can indicate hormonal imbalances often due to increased androgen levels, which in turn stimulate sebum production and can affect hair growth cycles.
Conditions such as thyroid dysfunction, where there is excessive accumulation of colloid in the thyroid follicles, can also affect hair growth. Therefore, various endocrine abnormalities can lead to the stimulation of hair growth beyond normal levels, which might manifest as increased body, facial, axillary, and pubic hair.