Symptom Checker - Loss of Smell 

​Differential diagnosis fo loss of smell are :
-sinusitis
-renal failure
-hepatic failure 
-allergic rhinitis
-nasal polyposis
-bronchial asthma
-vitamin B12 deficiency 
-hypothyroidism
-diabetes mellitus
-infuenza
-viral hepatitis
-antibiotics
-head trauma
-multiple scelrosis
-Parkinson’s disease 
-frontal brain tumor