Detecting cancer early significantly improves treatment outcomes, but with more than 200 types of cancer, symptoms can vary widely. The key is to pay attention to any changes in your body and speak with a healthcare professional if something feels unusual or persistent.

Cancer can affect specific areas—like the stomach, brain, or skin—or cause general symptoms such as fatigue, pain, or weight loss. While lumps are well-known warning signs, they are not the only important indicators. Any unexpected change should be evaluated, as symptoms differ from person to person.

Common warning signs fall into three categories: symptoms that continue for weeks or recur, symptoms without an obvious cause, and symptoms that are unusual for your body. Recognizing these patterns can support earlier diagnosis and better outcomes.

1. Unexplained Back Pain
Back pain is common, often linked to strain, posture, or aging. Cancer is rarely the cause, but some cancers—like spinal, colorectal, ovarian, lung, pancreatic, or kidney cancer—can create persistent back pain. Pain unrelated to movement, worse at night, or accompanied by weight loss, fatigue, or neurological symptoms should be checked by a doctor.

2. Persistent Abdominal Pain
Abdominal pain can stem from many causes, including cancer of the pancreas, liver, stomach, ovaries, or colon. Early stomach cancer may cause mild, dull upper abdominal discomfort, which can intensify over time. Ovarian cancer may involve pelvic pain, bloating, and appetite changes. Lasting or severe abdominal pain, especially with weight loss or nausea, requires medical evaluation.

3. Headaches and Neurological Symptoms
Most headaches are harmless, but recurring, severe, or changing headaches can indicate a brain tumor. Warning signs include morning headaches, pain that worsens over time, nausea, vision disturbances, or headaches unresponsive to medication.