Can ageusia be caused by lots of illnesses?

Yes. Neurological disorders such as bell's palsy, familial dysautonomia, and multiple sclerosis cause similar problems. Disorders of the endocrine system, such as cushing's syndrome, hypothyroidism and diabetes mellitus, can cause similar problems. Ageusia can also be caused by medicinal side-effects from antirheumatic drugs such as penicillamine, antiproliferative drugs such as cisplatin, ace inhibito.