30/m. mother diagnosed stage4 colon cancer @ 45. having difficulty passing stool last 6-mos. drink plenty of water. highly sedentary life style. bright blood when sitting (hemoroids from strain) but no blood when hunched/standing passing stool?

I'm not exactly sure what your question is. Regarding bleeding when defecating, different positions may cause bleeding from her hemorrhoids. Her physician can suggest a stool softener to ease her straining.

Constipation can be prevented by keeping a balanced diet, proper hydration and physical exercise that is critical for bowel activity. If bleeding persists talk to your doc as work up might be needed.

You should get a colonoscopy at age 35. It would be prudent to see a doctor for the treatment of hemorrhoids as bleeding can cause anemia. For constipation - You may take a fiber laxative like Metamucil and drink enough water daily so that your urine is colorless. For the long term you may try to increase your intake of fiber foods.