HI, thanks for using healthcare magic
There are different possible causes for persistent
nausea.
The possible causes are:(1) pregnancy
(2)viseral disease- conditions related to the organs in the abdomen.
This includes conditions such as reflux, obstruction of the bowel,
gall bladder disease,
liver disease,
urinary tract infection
(3)metabolic or toxic- side effect of medication, high calcium levels, alcohol use, high urea
(4)central nervous system- related to brain or spinal cord- mass in the brain, vertigo
Your doctor may consider imaging of the GI tract to rule out any GI causes, imaging of the brain may also be needed.
In addition blood tests can check calcium and urea levels.
The treatment would depend on the cause found.
I hope this helps