Acromegaly
Acromegaly is a condition that develops due to overproduction of growth hormone caused by a benign tumour of the pituitary gland. It leads to an increase in size of hands and feet, thickening of the skin and a change in the appearance of the face.

Addison's disease
Addison's disease is caused by damage to the adrenal glands which make hormones to control the body’s response to stress and balance body salt and water. Treatment is with tablets and some lifestyle adaptations to ensure patients remain well.

Addison's Disease Self-Help Group
The Addison's Disease Self Help Group is the UK support group for men, women and children suffering from Addison's disease (or adrenal deficiency) and for their families.

Adipose tissue
Adipose tissue (body fat) is crucial for health. Along with fat cells, adipose tissue contains numerous nerve cells and blood vessels, storing and releasing energy to fuel the body and releasing important hormones vital to the body’s needs.

Adrenal glands
The adrenal glands are small structures attached to the top of each kidney. The human body has two adrenal glands which release chemicals called hormones into the bloodstream. These hormones affect many parts of the human body.

Adrenal hyperplasia network
The Adrenal Hyperplasia Network UK has been set up to provide support for all ages with Congenital Adrenal Hyperplasia (CAH), particularly adults and teenagers.

Adrenaline
Adrenaline is a hormone released from the adrenal glands and its major action, together with noradrenaline, is to prepare the body for fight or flight.

Adrenocorticotropic hormone
Adrenocorticotropic hormone is produced by the pituitary gland. Its key function is to stimulate the production and release of cortisol from the cortex of the adrenal gland.

Adult growth hormone deficiency
Adult growth hormone deficiency is where the pituitary gland fails to produce enough growth hormone. It can be successfully treated with growth hormone therapy.

Age 8 and Wanting a Sex Change
A documentary following children in the US who tell their parents they were born in the wrong body.

ALD LIFE
ALD LIFE aims to help all affected by or interested in adrenoleukodystrophy and adrenomyeloneuropathy, whether personally or medically.

Am I Normal?
A series of BBC radio 4 interviews by Vivienne Parry exploring health issues that affect our nation.

Amenorrhoea
Amenorrhoea is the term used to describe a lack of ‘periods’ (menstrual cycles) in women. The management of amenorrhoea depends on the underlying cause.

American Association for Klinefelter Syndrome Information and Support

American Diabetes Association
The American Diabetes Association is the US's main non-profit organisation providing diabetes research information and advocacy. The mission of the As

Androgen Insensitivity Syndrome Support Group
This is a group providing information and support to young people and adults with complete and partial Androgen Insensitivity Syndrome, and to parents

Androstenedione
Androstenedione is a steroid hormone that has weak, androgenic actions on the body itself. However, it mainly acts as a stepping stone in the manufacture of testosterone and oestrogen within the body.

Angiotensin
Angiotensin helps to maintain blood pressure and fluid balance in the body.

Anorchidism Support Group
The Anorchidism Support Group was formed to serve and support any person, or the families of boys, with congenital or acquired absence of the testes.

Anti-diuretic hormone
Anti-diuretic hormone acts to maintain blood pressure, blood volume and tissue water content by controlling the concentration of urine made by the kidneys.

Association for Multiple Endocrine Neoplasia Disorders
AMEND is a patient group committed to supporting all those affected by multiple endocrine neoplasia (MEN) and its associated endocrine growths.