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Climb stairs.
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Complete household tasks.
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Concentrate at work.
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Maintain their normal exercise routine.
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Stay awake during the day.
Several mechanisms can contribute to cancer-related fatigue.
These include inflammation, changes in metabolism, anemia, poor nutrition, sleep disturbances, and the effects of the cancer itself.
Fatigue can occur in people with many different cancers, including leukemia, lymphoma, and cancers affecting the digestive system or other organs.
It can also develop during chemotherapy, radiation therapy, and other treatments.
However, fatigue is extremely common and is rarely enough by itself to suggest cancer.
Other possible causes include iron deficiency, thyroid disease, diabetes, sleep apnea, depression, chronic infections, and vitamin deficiencies.
If fatigue persists for several weeks, becomes progressively worse, or occurs alongside unexplained weight loss or other unusual symptoms, arrange a medical assessment.
4. Persistent Pain Without an Obvious Explanation
Pain is the body's way of signaling that something may be wrong.
Most pain is caused by non-cancerous conditions, such as muscle strain, arthritis, injuries, or inflammation.
However, persistent or unexplained pain can sometimes be associated with cancer.
The location depends on the affected organ or tissue.
For example:
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Persistent back pain may occasionally be associated with pancreatic cancer or cancer involving the spine.
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Ongoing abdominal pain may occur with cancers of the digestive organs.
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Bone pain may occur when cancer develops in or spreads to bone.
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Persistent headaches may occur with certain brain tumors.
Cancer-related pain may result from a tumor pressing against nearby nerves, bones, organs, or other structures.
It can also develop when cancer spreads to different parts of the body.
Some people notice pain that gradually becomes more frequent or severe.
Others experience discomfort that does not improve with ordinary treatment.
Nighttime pain is sometimes discussed as a warning sign, but pain occurring at night does not automatically indicate cancer.
The most important factors are persistence, progression, unexplained changes, and associated symptoms.
Seek medical advice if pain continues without a clear explanation, repeatedly returns, or interferes with normal activities.
Sudden severe pain, particularly when accompanied by weakness, difficulty breathing, or neurological symptoms, may require emergency evaluation.
5. Unusual Lumps or Swelling Anywhere in the Body
A new lump can understandably cause concern.
However, most lumps are not cancerous.
They may be caused by cysts, infections, fatty growths called lipomas, enlarged lymph nodes, or other benign conditions.
Nevertheless, certain lumps deserve medical examination.
Potential warning signs include:
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A lump that gradually increases in size.
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A hard or fixed lump.
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Swelling that does not disappear.
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A painless lump that continues growing.
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A new lump accompanied by unexplained weight loss or night sweats.
Lumps may appear in several locations, including:
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The breast.
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The neck.
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The armpit.
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The groin.
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The abdomen.
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The testicles.
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Beneath the skin.
For example, breast cancer can sometimes present as a new lump, although it may also cause skin dimpling, nipple changes, or unusual discharge.
Lymphoma can cause enlarged lymph nodes, often in the neck, armpits, or groin.
Some lymph nodes become enlarged because of ordinary infections and return to normal after the infection resolves.
However, persistent or unexplained enlargement should be assessed.
Never assume that a painless lump is harmless simply because it does not cause discomfort.
Depending on its location, doctors may recommend an examination, ultrasound, mammogram, or biopsy.
6. Persistent Changes in Bowel Habits
Changes in bowel habits are common.
Dietary changes, infections, medications, stress, and digestive disorders can all affect bowel movements.
However, persistent changes may sometimes indicate colorectal cancer or another gastrointestinal condition.
Warning signs can include:
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Diarrhea that continues without an obvious explanation.
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Persistent constipation.
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Alternating diarrhea and constipation.
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A feeling that the bowel has not completely emptied.
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Narrower stools that persistently differ from normal.
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Blood in the stool.
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Unexplained abdominal discomfort.
Colorectal cancer can develop in the colon or rectum.
Some tumors cause bleeding, while others gradually interfere with the passage of stool.
In certain cases, a person may experience no noticeable symptoms during the early stages.
This is why age-appropriate colorectal cancer screening is important.
Screening options may include stool-based tests and colonoscopy, depending on personal risk and medical recommendations.
Blood in the stool should never automatically be attributed to hemorrhoids.
Although hemorrhoids are common, bleeding can have other causes, including inflammatory bowel disease, polyps, and colorectal cancer.
Seek medical evaluation for persistent changes in bowel habits or unexplained rectal bleeding.
Severe abdominal pain, repeated vomiting, and inability to pass stool or gas may indicate an emergency.