FULLNESS IN STOMACH WITHOUT EATING ANYTHING

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MY DAD HAD SURVIVED GASTRIC CANCER BUT LAST MONTH DOCTOR SAID IT HAS REOCCURRED BECAUSE IT WAS FULL OF DARK THINGS BUT BIOPSY TAKEN SHOWS NO SIGN OF MALIGNANCY . NOW THE ONLY PROBLEM IS DIET, HE IS UNABLE TO HAVE ANYTHING. LAST MONTH HE WAS DIAGONISED WITH ASCITAL FLUID WHICH DOCTOR REMOVED THROUGH NEEDLE . NOW I AM CONFUSED ABOUT REOCCURRENE IF IIT IS HOW TO TREAT THAT AND IF NOT HOW BE SAFE FROM REOCCURRENCE.HOPING FOR GOOD ANSWERS FROM MY FRIENDS.