What are the symptoms and stages of colon cancer?

My dad has been in pain for 2 months now. We went to a few doctors to get CT scans, colonoscopies, and x-rays. They found a tumor blocking the outside of the large intestine. What are the chances of it being benign and not malignant? His symptoms are constipation, abdominal pain, and weakness. I’m afraid this is stage 4 of colon cancer because of the low survival rate... I love him very much and would not want anything bad to happen to him.

I forgot to say that the hospital wouldn’t admit him into the hospital unless recommended by a doctor. He will be getting an MRI next week. I hope it’s nothing dangerous

I don't know what I would do without him......

Almost all colon cancer start in glands in the coating of the digestive tract and anus.
You have a high risk of colon cancer if you are older than 60,if you eat a lot of red or prepared foods,if you have a genealogy of digestive tract cancer,if you have a personal history of breast cancer,if you have inflammatory bowel disease,if you have a family history of colon cancer.

thanks