| Abdomen – swollen |
| Abdominal bloating |
| Abdominal cramps |
| Abdominal distention |
| Abdominal fullness prematurely after meals |
| Abdominal hernia |
| Abdominal mass |
| Abdominal pain |
| Abdominal rigidity |
| Abdominal sounds |
| Abdominal tenderness |
| Abdominal wall defects |
| Abnormal posturing |
| Abnormal tooth shape |
| Absence of thirst |
| Absent pulse |
| Accessory nipples |
| Aches – leg |
| Aches and pains in bones |
| Achromacria |
| Acne-like skin bumps |
| Acting strangely |
| Activity – increased |
| Adipsia |
| Agitation |
| Alertness – decreased |
| Alopecia |
| Ambiguous genitalia |
|
| Amenorrhea |
| Amnesia |
| Anasarca |
| Anhidrosis |
| Anisocoria |
| Ankle pain |
| Ankle swelling |
| Anosmia |
| Anterior tibia pain |
| Anxiety |
| Aphasia |
| Apnea |
| Appetite – decreased |
| Appetite – increased |
| Apprehension |
| Apraxia |
| Arachnodactyly |
| Arm and leg movements – uncontrollable |
| Armpit lump |
| Arterial insufficiency of the legs |
| Arthralgia |
| Ataxia |
| Athetoid movements |
| Atrophy of the muscles |
| Autistic behavior |
| Axillary abscess |
| Axillary lymph enlargement |
| Axillary lymphadenopathy |
|
