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Abdominal Aortic Aneurysm (AAA) Enlargement of abdominal aorta, operate > 5.5cm

Acanthosis Nigricans Darkened auxilla associated with obesity, T2DM and gastric cancer

Achalasia Dysphagia solids, liquids; bird beak barium swallow

Achrondroplasia Short limbed dwarfism

Actinic Keratosis Skin lesion from sun damage

Acne Roseacea Skin lesion causing red face and rhinophyma

Acne Vulgaris Medical name for acne, facial pustules

Acoustic Neuroma Slow growing CN VIII, 

Acromegaly Growth Hormone Excess

Acute Interstitial Nephritis Commonly Nsaid induced AKI

ALL (Acute Lymphoblastic Leukemia) Childhood leukaemia of lymphocytes

Acute myeloid leukaemia Largely adulthood leukaemia of myelocytes

Acute tubular necrosis AKI caused by e.g. gentamicin, raised urinary sodium

Addison's Autoimmune Adrenal Insufficiency 

Adrenal Insufficiency Hypo-glucocorticoid & hypo-mineralocorticoid disorders

Alcoholism Alcohol addiction

Alopecia: Auto immune hair loss

Alport's Syndrome: Kidney + Hearing problems

Anaemia Low haemoglobin- constellation of diagnosis

Anaphylaxis Systemic allergic reaction (involving 2+ body systems)

Aortic Regurgitation Leaky aortic valve

Aortic Stenosis: Narrowing of aortic valve (includes aortic sclerosis)

Aspergillosis Include invasive aspergillosis, aspergilloma and allergic broncho-pulmonary aspergillosis

Asthma Allergic & reversible bronchiole narrowing producing wheeze, see Asthma 

Atrial Fibrillation Atria contracting irregularly irregularly

Atrial Septal Defect Hole between left and right atria

Autoimmune encephalitis: Affects limbic system, anti Hu

Autoimmune hepatitis: Anti smooth muscle antibodies