​Differential diagnosis of parasitic lung infection 
-amebic abscess
-echinococcosis 
-tropical pulmonary eosinophilia 
-toxocariasis 
-paragonimiasis 
-strongyloidiasis 
-hookworm 
-ascariasis 

​Differential diagnosis of Paragonimiasis 
-amebic lung abscess
-Legionnaire’s disease
-bacterial pneumonia 
-Mycoplasma pneumoniae infection 
-tuberculosis 

​Differential diagnosis of paradoxically split S2 / or no split 
-left bundle branch block 
-left ventricular failure 
-aortic stenosis 

Differential diagnosis of papules and nodules 
-foreign body granuloma 
-sporotrichosis
-gummas (tertiary syphilis) 
-calluses 
-corns 
-metastases 
-calcinosis cutis
-sarcoidosis 
-gout 
-rheumatoid arthritis 
-granuloma annulare 
-keratosis pilaris 
-milia 
-sebaceous hyperplasia 
-nevus 
-molluscum contagiosum 
-xanthoma 
-lipoma
-sebaceous cyst 
-epidermal inclusion cyst 
-squamous cell carcinoma 
-basal cell carcinoma 
-warts 
-skin tag ( acrochordon) 
-neurofibroma 
-dermatofibroma 
-melanoma 
-nevus 
-seborrheic keratosis 
-urticaria 
-miliaria 
-prurigo nodules 
-keratoacanthoma 
-basal cell carcinoma 
-erythema nodosum 
-scabies 
-furuncle
-folliculitis 
-hemangioma 
-cherry angioma 
-acne vulgaris 
-insect bites 
-endocarditis( Osler’s nodes( 
-mycosis fungoides 
-cutaneous T cell lymphoma 
-venous lake 
-blue nevus 
-kaposi’s sarcoma 
-melanoma 
-lichen planus 
-vasculitis 

​Differential diagnosis of causes of papillary necrosis 
-cirrhosis 
-tuberculosis 
-renal vein thrombosis 
-urinary tract obstruction 
-pyelonephritis 
-sickle cell trait 
-sickle cell disease
-diabetes mellitus 
-analgesic nephropathy 

​Differential diagnosis of papillary necrosis 
-medullary spongy kidney 
-renal tuberculosis 

​Differential diagnosis of panic disorder
-somatoform disorder such as somatization 
-obsessive compulsive disorder 
-post traumatic stress disorder 
-medication or substance abuse such as nicotine, caffeine, cocaine, pseudoephedrine, amphetamine, 
-pheochromocytoma 
-hyperthyroidism 
-supraventricular tachycardia 
-angina pectoris 

​Differential diagnosis of pancytopenia 
-tuberculosis 
-AIDS 
-leishmaniasis 
-brucellosis 
-histoplasmosis 
-hepatitis 
-Epstein Barr Virus 
-Parvovirus B19 
-systemic lupus erythematosus 
-hypersplenism 
-genetic due to Fanconi’s anemia 
-bone marrow irradiation 
-paroxysmal nocturnal hemoglobinuria 
-megaloblastic anemia 
-infiltrative disease such as lymphoma, myeloma, carcinoma, hairy cell leukemia 
-myelofibrosis 
-acute leukemia 
-myelodysplastic syndrome 
-aplastic anemia 

​Differential diagnosis of pancreatic cancer : 
-primary biliary cirrhosis 
-primary sclerosing cholangitis 
-hepatocellular carcinoma 
-biliary stricture 
-carcinoma of the biliary tract 
-pancreatic pseudocyst 
-cystic neoplasm 
-choledocholithiasis 

​Differential diagnosis of palpitation 
-anxiety 
-anemia 
-thyrotoxicosis 
-exercise
-valvular regurgitation 
-arrhytmias