​Differential diagnosis of hematological or vascular disorders causing perception hearing loss are : 
-diabetes mellitus 
-hypercoagulable states
-macroglobulinemia 
-hyperlipoproteinemia
-fat emboli 
-infarction 
-Meniere’s disease
-Berger’s disease
-polycythemia vera 
-leukemia 
-sickle cell anemia 

​Differential diagnosis of infections causing perception hearing loss are : 
-lyme disease
-tertiary syphilis 
-mumps 
-measles
-influenza
-herpes zoster
-herpes simplex
-Epstein – Barr virus 
-cytomegalovirus infection 

​Differential diagnosis of noise inducing perception hearing loss are : 
-acute noise exposure 
-long term noise exposure 

​Differential diagnosis of neoplasm causing perception hearing loss are : 
-acoustic neuroma 
-metastases

​Differential diagnosis of perception hearing loss are : 
-noise induced hearing loss
-neoplasm
-presbycusis 
-infection 
-ototoxic drugs 
-toxin 
-vascular or hematological disorders
-pregnancy 
-autoimmune disease
-hypothyroidism 
-diabetes mellitus 
-hereditary condition 
-congenital deafness
-multiple sclerosis 
-trauma 

​Differential diagnosis of trauma causing conductive hearing loss are : 
-barotrauma ( due to rapid descent in water or air ) 
-head trauma 

​Differential diagnosis of middle ear effusion causing conductive hearing loss are : 
-eustachian tube dysfunction 
-acute or chronic otitis media 

Differential diagnosis of foreign bodies causing conductive hearing loss is : 
-ear wax

​Differential diagnosis of conductive hearing loss are : 
-foreign bodies 
-cerumen impaction 
-middle ear effusion 
-otitis externa 
-cholesteatoma 
-osteosclerosis 
-trauma 
-mastoiditis 

​Differential diagnosis of acute colour sensation impairment are : 
-sulfonamides
-streptomycin 
-santonin 
-digitalis intoxication 
-chlorothiazine 
-barbiturates 
-amylnitrite