A in Research
- Aagenaes syndrome
- Acromegaly
- Acute radiation syndrome
- Adactylia unilateral dominant
- Adams Nance syndrome
- Adams Oliver syndrome
- Addison's disease
- Adducted thumb and clubfoot syndrome
- Adducted thumb syndrome recessive form
- Adducted thumbs Dundar type
- Adenine phosphoribosyltransferase deficiency
- Adenoameloblastoma
- Adenocarcinoid tumor
- Adenocarcinoma of lung
- Adenoid cystic carcinoma
- Adenoma of the adrenal gland
- Adenomyosis
- Adenosarcoma of the uterus
- Adenosine deaminase deficiency
- Adenosine monophosphate deaminase deficiency