What Does the Pituitary Gland Do? (9 Functions)

What Does the Pituitary Gland Do? (9 Functions)

Clinically Reviewed by Dr. Andrew Stein MD, Consultant Physician. Last updated: April 2026

The pituitary gland is a tiny, pea-sized organ located at the base of the brain, sitting in a bony hollow called the sella turcica. Despite its small size, it is often referred to as the “Master Gland” because it controls the activity of most other hormone-secreting glands in the body.

How the Pituitary Works

The pituitary gland acts as a relay station. It receives signals from the hypothalamus (the part of the brain that monitors body conditions) and responds by releasing hormones that tell other organs—like the thyroid, adrenals, and reproductive organs—exactly what to do.

9 Primary Functions of the Pituitary Gland

The pituitary is divided into two main sections: the Anterior (Front) Lobe and the Posterior (Back) Lobe. Each secretes different hormones to manage specific bodily functions.

1. Growth Regulation (GH)

The pituitary produces Growth Hormone (GH). In children, this is essential for the development of bone and muscle. In adults, GH helps maintain healthy bone density and muscle mass and influences how the body stores fat.

2. Thyroid Control (TSH)

The pituitary secretes Thyroid-Stimulating Hormone (TSH). This hormone travels to the thyroid gland in your neck, telling it how much thyroid hormone to produce to regulate your metabolism and energy levels.

3. Stress Response Management (ACTH)

The pituitary produces Adrenocorticotropic Hormone (ACTH), which stimulates the adrenal glands to release cortisol. This process is vital for the body’s response to stress, regulating blood pressure and blood sugar.

4. Reproduction and Fertility (LH & FSH)

The gland produces Luteinising Hormone (LH) and Follicle-Stimulating Hormone (FSH).

• In women, these stimulate the ovaries to produce oestrogen and progesterone and manage the menstrual cycle.

• In men, they stimulate the testes to produce testosterone and sperm.

5. Breastfeeding and Milk Production (Prolactin)

The anterior lobe produces Prolactin, the hormone that stimulates breast milk production after childbirth. It also has an effect on sex hormone levels in both men and women.

6. Water Balance (ADH)

Stored in the posterior lobe, Antidiuretic Hormone (ADH), also known as vasopressin, helps the kidneys manage the amount of water in your body. It prevents dehydration by signaling the kidneys to conserve water and concentrate urine.

7. Childbirth and Bonding (Oxytocin)

The posterior lobe releases Oxytocin, often called the “love hormone.” It triggers uterine contractions during labor and the release of milk during breastfeeding. It is also linked to social bonding and trust.

8. Skin Pigmentation (MSH)

The pituitary produces Melanocyte-Stimulating Hormone (MSH), which can increase the production of melanin in the skin in response to UV light exposure.

9. Pain Relief (Endorphins)

The pituitary gland produces endorphins, the body’s natural painkillers. These chemicals act on the nervous system to reduce the perception of pain and produce a feeling of well-being.

Common Pituitary Disorders

When the “Master Gland” malfunctions, it creates a domino effect across the body. Common issues include:

• Pituitary Adenomas: Small, usually benign tumors that can cause the gland to produce too much or too little of a specific hormone.

• Diabetes Insipidus: Caused by a lack of ADH, leading to extreme thirst and excessive urination (distinct from sugar-related diabetes).

• Gigantism or Acromegaly: Caused by the overproduction of Growth Hormone.

• Hypopituitarism: A condition where the gland fails to produce one or more of its hormones, leading to widespread hormonal deficiencies.

Summary: Pituitary Hormones at a Glance