Hello Doctor, I am from India. My father is 60 years old. He has diabetis and high blood pressure from last 10 years. From last 4/5 days he has suffering from severe gastric. His bellybutton getting swell with gas and feeling bit pain in naval area. His body temperature also getting fluctuate. sometimes he is feeling very hot so taking bath 2/3 times per day and sometimes feeling like fever. whats the cause. is this a symptom for any liver or kidny disorder. As he has some problem in his Liver which was in initial stage tested 2 years back.