Cancer can sometimes develop without obvious symptoms, but certain persistent or unexplained changes in the body should not be ignored. Signs such as unexplained weight loss, unusual fatigue, a persistent cough, breathing difficulties, or ongoing pain can have many causes, but they may sometimes require medical evaluation.

Other changes that deserve attention include blood in the urine or stool, changes in bowel or urination habits, difficulty swallowing, persistent hoarseness, unusual skin changes, or sores that do not heal. Swollen lymph nodes, recurring headaches, vision changes, and unexplained bone or joint pain can also have numerous causes and should be discussed with a healthcare professional if they persist or worsen.

Symptoms such as ongoing nausea or vomiting, prolonged fever, and unexplained night sweats may also warrant medical attention, particularly when they occur alongside other concerning changes. Importantly, having one of these symptoms does not mean you have cancer—many are caused by infections or other non-cancerous conditions.

The most important message

Do not wait for symptoms to become severe. If you notice a persistent, unexplained change in your health, speak with a doctor. Regular checkups and recommended cancer screenings can help detect certain cancers earlier, when treatment may be more effective.