HI, thanks for using healthcare magic
There are different causes of generalized itching. They include: (1) infection such as
scabies, this tends to be worse at night
(2)liver disease
(3)
kidney disease
(4)side effect of medication
(5)
thyroid disease
(6)neuropathy- nerve related disorders, diabetes
(7)iron deficiency
(8)rare cases- malignancy
To find the cause, if it continues, you would need to consider seeing your doctor for an assessment.This would include physical examination along with blood tests as well.
Bloods may be liver , kidney function,
complete blood count, thyroid function levels.
These may not be necessary if there is an obvious cause.
I hope this helps