Hi, my dad is 78 years old and he is getting stomach ache from past 1 month and keep going to poop 3 - 4 times per day. is it related to liver cancer?

Need more info: Does he have a known diagnosis of cancer? If he has not been checked by a physician, then he should go and see his doctor for a physical examination and some lab tests. In an older person, cancer is a serious consideration but pain in stomach can also be caused by other reasons like an Ulcer in the stomach. Get him to have a medical check up soon.