Many, many things.
Lot depends on hx of these symptoms (history leads to over 95% of the diagnoses, most of the time testing adds little, or confirms the DX of an experienced clinician taking time to listen.
Within these parentheses lies the answer to a failed health system at double the cost). Here, the answer is in the hx. Is it acute, recurrent, chronic, etc. diangosis is in doc's brain, add compassion, give all a good 'gp'.