Differential diagnosis of fatigue and weight loss are :
-hyperthyroidism
-malabsorption
-peptic ulcer
-pancreatic insufficiency
-uncontrolled diabetes mellitus
-alcoholism
-cancer
-HIV
-lyme disease
-endocarditis
-hepatitis
-tuberculosis
-adrenal insufficiency
-chronic heart disease
-chronic renal disease
-chronic lung disease
-hypercalcemia
-anorexia due azotemia
-hyperthyroidism
-malabsorption
-peptic ulcer
-pancreatic insufficiency
-uncontrolled diabetes mellitus
-alcoholism
-cancer
-HIV
-lyme disease
-endocarditis
-hepatitis
-tuberculosis
-adrenal insufficiency
-chronic heart disease
-chronic renal disease
-chronic lung disease
-hypercalcemia
-anorexia due azotemia