Examples include:
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Blood in the urine, even if it occurs only once.
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Blood in the stool or repeated rectal bleeding.
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Coughing up blood.
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Unusual vaginal bleeding between periods or after menopause.
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Bleeding that continues longer than expected or occurs repeatedly.
Certain cancers can cause bleeding when they affect the lining of an organ or damage nearby blood vessels. For example, blood in the urine can sometimes be associated with cancers of the urinary tract, while unusual vaginal bleeding may be a warning sign of cervical or uterine disease.
However, bleeding does not automatically mean cancer. Urinary infections, hemorrhoids, hormonal changes, medications, and other conditions can produce similar symptoms.
The important point is not to guess at the cause. Blood in the urine, unexplained rectal bleeding, or unusual vaginal bleeding should be discussed with a healthcare professional, even if the amount is small or the symptom disappears.
Heavy bleeding, fainting, severe weakness, or bleeding accompanied by significant pain may require urgent medical attention.
9. A New Lump or Persistent Swelling
Finding a lump can be worrying, but many lumps are noncancerous. Cysts, fatty growths, enlarged lymph nodes, infections, and other benign conditions can all produce swelling.
Nevertheless, a new lump or one that changes over time deserves attention. Depending on the underlying condition, a lump may be painless, tender, firm, soft, or mobile beneath the skin. No single characteristic can reliably establish whether it is cancerous.
Areas where people may notice lumps include the breast, neck, armpit, groin, and abdomen. Breast changes can occur in people of different sexes, so a new breast lump or an unexplained change in breast shape or skin should be assessed rather than dismissed.
A healthcare professional may examine the area and decide whether imaging, laboratory tests, or a biopsy is appropriate. The right investigation depends on the lump's location, characteristics, and the person's medical history.
Avoid repeatedly squeezing or pressing a lump in an attempt to determine what it is. Instead, note when you first noticed it, whether it appears to be growing, and whether other symptoms are present.
If a lump persists, enlarges, or is accompanied by unexplained weight loss or other changes, arrange an appointment for evaluation.
10. Recurrent Infections or Slow Recovery
Frequent infections can sometimes be associated with problems affecting the immune system or the body's ability to produce healthy blood cells. In certain circumstances, blood cancers and other serious conditions may contribute to repeated infections.
However, most recurring infections have more common explanations, including exposure to infectious organisms, chronic medical conditions, medication effects, or underlying problems affecting a particular organ.
It is useful to consider whether infections are becoming more frequent than usual, whether they are unusually severe, or whether recovery consistently takes longer than expected. A healthcare professional may review the pattern and determine whether further testing is warranted.
Other symptoms can provide important context. Recurrent infections accompanied by persistent fever, unusual bruising, unexplained bleeding, swollen lymph nodes, or significant fatigue may deserve particular attention.
There is no specific number of infections that automatically indicates cancer. The nature, severity, duration, and combination of symptoms all matter.
If you are experiencing repeated or unusually severe infections, seek medical advice instead of relying on supplements or unproven immune-boosting products. Identifying the actual cause is the most useful step toward appropriate treatment.
11. Persistent Night Sweats or Unexplained Fever
Occasional sweating during sleep can occur because a bedroom is too warm, bedding is heavy, or a person is experiencing a temporary illness. Hormonal changes, medication, anxiety, and infections can also cause night sweats.