13 Symptoms of Colorectal Cancer

Colorectal cancer is one of the leading causes of cancer-related deaths, in part because symptoms often don’t appear until the disease has progressed. In fact, more than 60% of cases are diagnosed only after the cancer has already spread. That’s why recognizing early signs—however vague or nonspecific—is critical.

Many symptoms of colorectal cancer overlap with other gastrointestinal issues. But if they persist for more than a few days or worsen over time, it’s important to seek medical advice.

1. Diarrhea

A noticeable change in bowel habits is one of the earliest and most common signs of colorectal cancer. For some, this begins with persistent diarrhea—loose or watery stools that last for more than a few days. Diarrhea may also be accompanied by dizziness, especially when standing up quickly. While occasional diarrhea is common, symptoms that don’t improve could indicate a more serious underlying condition.