25 is not very high. The cut off for a positive reading is 10 and as your doctor said, plenty of people get results in the 100s. You will see posts on this site where people got results of 300 or 500 or 900 and didn't turn out to have cancer.

I read somewhere that one in 10 people will have a positive result on the FIT test. It just means there is blood in your stool and many, many things can cause that. Some possibilities are hemmorhoids, a fissure, a polyp, ulcerative colitis or Crohns (thought these two might be less likely in your case, because I think they are often diagnosed at younger ages and often have additional symptoms but I could be wrong), an infection, diverticulitis...Yes, cancer is also a possibility, but it's far from the most likely. 

I doubt your dad having lung cancer would mean anything. Cancer is common and most people will have family members who have had some form of it. I doubt that means you are at any higher risk.

And yes, they will have to do a colonoscopy whenever there is a positive FIT, but that's not just "to see if you have cancer or not." It's to see what is causing the bleeding. If you have a polyp, they will want to remove it because some polyps can become cancer after many years and obviously if you have Crohn's or ulcerative colitis or diverticulitis, they will also need to know that so as to treat it.

I know it's hard not to think of the worst case scenario, but it is only one possibility out of many and the odds are probably strongly against it. Hemorrhoids or a polyp or a fissure are probably far more likely.

Thank you very much for your reply. i had piles years ago. My mum had diverticulitis and a perforated bowel years ago yes your right, but I shouldn't worry so my husband has recently been diagnosed with MCI with Lewy bodys so i care for him with this on top its too much but thank you for helping put my mind at rest ... Sheila 

Thank you for your reply. I hope you're recovering well after your procedure .i had a hysterectomy years ago left my overys as i woul have gone into menopause at 45 back then . on my Fit test results indicates high risk colonecterol? cancer didn't understand the result numbers and anything to do with the C word just so worried and with my husband mild cognative impairment with lewy body's I am just panicking ... sheila