Hi thanks for contacting HCM... You have fat digestion problem mainly ... So you could have fat malabsorption syndrome .... To rule out cause non invasive test done first ..... USG abdomen and serum lipase and amylase estimation done for rule out pancrease problem .... Breath test also available for detecting pancrease problem. ... If needed for pancrease invasive test might done. ... If no cause found stool routine examination done along with fat estimation.... If still need further work up I suggest you to go for endoscopy and biopsy to rule out tropical sprue like condition.... Meanwhile avoid high fatty foods .... Fiber foods taken more .... Avoid smoking and alcohol .... Consult gastroenterologist with keeping this in mind ... Take care ...