Does colon cancer cause left-sided or right-sided abdominal pain?

Colorectal cancer is a condition that many people instinctively fear. With modern changes in diet and lifestyle, its incidence has been rising sharply. Consequently, individuals are increasingly prioritizing their health—and many wonder whether abdominal pain associated with colorectal cancer occurs on the left or right side of the abdomen. So, does colorectal cancer cause left-sided or right-sided abdominal pain? Below, we address this question.

Does colorectal cancer cause left- or right-sided abdominal pain?

Colorectal cancer is a tumor arising within the intestinal tract—specifically, an abnormal proliferation of tissue in the colon or rectum. Its primary symptoms include abdominal pain, as well as passage of mucopurulent or bloody stools. The precise location of abdominal pain depends on the tumor’s anatomical site: for instance, tumors in the right hemicolon typically cause right-sided abdominal pain, whereas tumors located elsewhere may produce pain in corresponding regions. Once diagnosis is confirmed, surgical resection remains the mainstay of treatment. However, postoperative management—including decisions regarding adjuvant chemotherapy—depends on intraoperative findings and final pathological results.

Knowledge Expansion: What Are the Symptoms of Colorectal Cancer?

1. Rectal bleeding

Many patients with colorectal cancer experience hematochezia (blood in stool), resulting from mucosal injury or tumor ulceration and bleeding. Such bleeding often alters stool color: while normal stool is yellowish-brown, black or tarry stools should raise suspicion for colorectal cancer and warrant prompt medical evaluation.

2. Abdominal pain and bloating

Unexplained, persistent abdominal pain may signal colorectal cancer. Additionally, affected individuals often experience significant abdominal distension and bloating—especially after meals. This symptom may reflect impaired digestion and excessive gas production due to tumor-related obstruction or functional disruption. Persistent bloating warrants timely assessment of gastrointestinal function.

The above outlines whether colorectal cancer causes left- or right-sided abdominal pain. We hope this information is helpful to you.