These symptoms have numerous possible causes, so proper evaluation is necessary rather than assuming cancer is responsible.
3. A Lump or Swelling That Doesn't Go Away
One of the most recognizable potential warning signs of cancer is a new lump or swelling that persists.
A lump can occur almost anywhere in the body. Some are completely harmless, including cysts, swollen lymph nodes, and benign growths.
What matters is the pattern.
A lump that is new, persistent, enlarging, unusually firm, or associated with other symptoms should be checked by a healthcare professional.
Do not attempt to diagnose a lump simply by touching it. Imaging or other medical testing may sometimes be necessary to determine what it is.
4. Unexplained Weight Loss
Losing weight without deliberately changing your diet or exercise routine can be an important warning sign.
Cancer is one possible cause, but there are many others, including thyroid disorders, digestive diseases, infections, medication effects, depression, and other medical conditions.
The concern becomes greater when unexplained weight loss occurs alongside symptoms such as:
Persistent fatigue, loss of appetite, ongoing pain, changes in bowel habits, or recurrent fever.
Rather than immediately assuming the worst, unexplained weight loss should be treated as a reason to investigate what is happening.
5. Persistent or Unexplained Pain
Pain is one of the most nonspecific symptoms in medicine.