ARIA is short for amyloid-related imaging abnormalities. Alzheimer's patients with ARIA exhibit abnormal differences in MRI scans. ARIA manifests as either: ARIA-E swelling (cerebral edema) and/or ARIA-H bleeding (cerebral hemorrhages). Patients with ARIA typically experience headaches, confusion, vomiting, and tremors. At worst, the patient may have a seizure, have a stroke, or die.