13 Symptoms of Colorectal Cancer

2. Constipation

Chronic constipation is another red flag, especially when it develops suddenly or becomes more severe over time. In colorectal cancer, tumors can partially block the intestine, slowing the passage of stool. This leads to infrequent, hard, or painful bowel movements. Increasing fiber intake and hydration may offer temporary relief, but persistent constipation—particularly when paired with abdominal discomfort or bloating—warrants medical attention.