I have a sister who has problem of gambling how to treat the compusive behaivor.?

CANCER: Please see your primary care physician. Blood in the stool has many causes the most severe being cancer or tumor formation. Seeing as you are also constipated there is a chance that your bowel (intestine) is obstructed.

Gambling: Gambling is a highly self destructive addictive behavior that often has severe consequences. Confronting and getting the addict to see the problem, helping them to break down their denial of the problem, and then holding them accountable to get the help that they need, and keeping them away from temptation. Gambling is not worth losing your family, destroying your finances, and your credit score.