Hair growth follows an intrinsic rhythm and is regulated by multiple growth factors, cytokines and local mediators. It is modified by systemic factors and [[Pineal Gland - Anatomy & Physiology|pineal]], [[Pituitary Gland - Anatomy & Physiology|pituitary]], [[Thyroid Gland - Anatomy & Physiology|thyroidal]], [[Adrenal Glands - Anatomy & Physiology|adrenal]] and [[Reproductive Hormones Overview - Anatomy & Physiology|reproductive hormones]]. | Hair growth follows an intrinsic rhythm and is regulated by multiple growth factors, cytokines and local mediators. It is modified by systemic factors and [[Pineal Gland - Anatomy & Physiology|pineal]], [[Pituitary Gland - Anatomy & Physiology|pituitary]], [[Thyroid Gland - Anatomy & Physiology|thyroidal]], [[Adrenal Glands - Anatomy & Physiology|adrenal]] and [[Reproductive Hormones Overview - Anatomy & Physiology|reproductive hormones]]. |