You learn you’re anemic
A diagnosis of anemia may be the first sign that you’re bleeding internally, even if you haven’t seen any other colon cancer symptoms. “If a woman is menstruating, anemia is less likely to be followed up with additional tests to see if it could be something else, like colon cancer,” says Randall Holcombe, MD, chief medical officer, cancer, at Mount Sinai Health System in New York City. “If a man is anemic, you assume he’s bleeding from somewhere.” It’s not uncommon for people to bleed internally for up to six months before anything shows up in the stool, says Patricia Raymond, MD, a fellow at the American College of Gastroenterology. If you experience any signs of anemia, such as fatigue, skin pallor or dizziness, see a doctor; these can also be colon cancer symptoms. To prevent colon cancer symptoms like these, make sure you adopt the 7 habits that can help prevent colon cancer.
You can’t catch your breath
Another side effect of a slow internal bleed is shortness of breath. If you aren’t bleeding aggressively or vomiting blood, your body puts more plasma in the blood without making more iron or red blood cells, says Dr. Raymond. This prevents you from losing blood in large volumes but reduces blood’s ability to carry oxygen, which is why you might notice shortness of breath, one of the overlooked colon cancer symptoms.