Key signs and symptoms of cancer

Signs and symptoms are both signals of injury, illness, disease – signals that something is not right in the body. A sign is a signal that can be seen by someone else – maybe a loved one, or a doctor, nurse, or other health care professional. For example, fever, fast breathing, and abnormal lung sounds heard through a stethoscope may be signs of pneumonia. A symptom is a signal that’s felt or noticed by the person who has it, but may not be easily seen by anyone else. For example, weakness, aching, and feeling short of breath may be symptoms of pneumonia.
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