Significant and unexplained weight loss, especially when not associated with changes in diet or exercise, can be a sign of various types of cancer.
Persistent and unexplained fatigue or weakness that doesn't improve with rest can be an early symptom of several types of cancer.
Ongoing or recurring pain, especially if it doesn't have an obvious cause or doesn't improve with treatment, can be a symptom of various cancers.
Any unusual changes in the color, size, shape, or texture of moles, freckles, or skin spots should be examined by a dermatologist.
Difficulty swallowing, persistent indigestion, or frequent heartburn could be early signs of esophageal or stomach cancer.
Persistent changes in bowel movements (e.g., diarrhea, constipation, blood in stool) or urinary habits could be symptoms of colorectal or urinary tract cancers.
A chronic cough, hoarseness, or coughing up blood could be early signs of lung or throat cancer.
Unexplained bleeding or bruising, especially if it persists or is frequent, should be discussed with a doctor.