Hormone

A hormone is a chemical messenger produced by glands in the endocrine system that travels through the bloodstream to target organs and tissues, where it regulates specific physiological processes. Hormones control an enormous range of body functions including growth, metabolism, reproduction, mood, sleep, appetite, immune function, and stress response. Even tiny amounts of hormones can produce profound effects on body function.

The major hormone-producing glands include the hypothalamus and pituitary (the master regulators in the brain), thyroid, parathyroids, adrenals, pancreas, ovaries, and testes. These glands form an interconnected network where hormones from one gland influence the activity of others through complex feedback loops. The hypothalamic-pituitary axis coordinates much of this communication, acting as the body's central hormonal control system.

Hormones can be classified by their chemical structure into three main categories: steroid hormones (derived from cholesterol, including cortisol, estrogen, testosterone, and progesterone), peptide/protein hormones (including insulin, growth hormone, and thyroid-stimulating hormone), and amino acid derivatives (including thyroid hormones, epinephrine, and melatonin). Each type has different mechanisms of action, rates of clearance, and methods of transport in the blood.

Hormonal health is foundational to overall well-being. Conditions like hypothyroidism, diabetes, PCOS, adrenal insufficiency, and growth hormone deficiency all result from hormonal imbalances. If you're experiencing symptoms like unexplained fatigue, weight changes, mood shifts, menstrual irregularities, or changes in libido, hormonal testing may be appropriate.

Hormone testing typically involves blood draws timed to specific points in the day or menstrual cycle. Treatment options range from hormone replacement therapy to medications that modulate hormone production or activity, to lifestyle changes that support healthy hormone balance.