Aphasia HP:0002381 UMLS:C0003537 Losing words Loss of words SNOMEDCT_US:87486003 Aphasia is caused by brain injury. The most common cause is stroke, but aphasia can also be caused by other factors such as head trauma, brain tumors, or infections. MSH:D001037 Difficulty finding words An acquired language impairment of some or all of the abilities to produce or comprehend speech and to read or write. Abnormal nervous system physiology