However, persistent pain that continues to worsen, repeatedly interrupts sleep, or occurs without a clear explanation should be assessed.
Some cancers can cause pain when a tumor presses on nearby structures, affects nerves, or spreads to bones or other tissues.
For example, persistent bone pain may occur in certain blood cancers or cancers that have spread to bone.
Yet nighttime pain alone is not a reliable way to identify cancer. The timing of pain does not establish its cause.
Seek medical advice if pain:
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Persists or progressively worsens.
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Repeatedly wakes you from sleep.
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Occurs with unexplained weight loss or fever.
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Is accompanied by weakness, numbness, or difficulty walking.
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Appears without an obvious injury and does not improve.
Severe sudden pain, new paralysis, loss of bladder or bowel control, or pain associated with chest pressure and difficulty breathing requires urgent medical attention.
6. Persistent Fever Without an Obvious Explanation
A fever is usually a sign that the immune system is responding to an infection or another inflammatory process.
Most fevers are caused by common infections, including respiratory illnesses and urinary tract infections.
However, recurring or prolonged fever without a clear explanation should not be ignored.
Certain cancers, particularly some lymphomas and leukemias, can be associated with unexplained fever. This may happen because cancer cells or the body's immune response produce substances that affect temperature regulation.
Other possible causes include tuberculosis, autoimmune diseases, inflammatory conditions, and medication reactions.
A healthcare professional may ask about the pattern of fever, travel history, exposure to infections, medications, and other symptoms.
Depending on the situation, tests may include a blood count, inflammatory markers, urine tests, imaging, or tests for specific infections.
A persistent fever does not automatically mean cancer. It does, however, deserve a proper explanation, particularly when accompanied by night sweats, swollen lymph nodes, or unexplained weight loss.
7. Itching That Has No Clear Explanation
Itching is usually associated with skin problems such as dryness, eczema, insect bites, allergies, or irritation from soaps and detergents.
Sometimes, however, itching occurs without a visible rash.
Persistent generalized itching can occasionally be associated with internal medical conditions, including liver disease, kidney disease, thyroid disorders, and certain blood cancers.
Some people with lymphoma report significant itching, although this symptom is not specific to the disease.
Possible causes of widespread itching include:
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Dry skin.
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Allergic reactions.
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Medication side effects.
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Liver or bile duct disorders.
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Kidney disease.
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Iron deficiency.
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Thyroid conditions.
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Certain blood disorders.
If itching continues despite basic skin care, spreads across the body, or occurs alongside other unexplained symptoms, consult a healthcare professional.
Seek urgent care if itching occurs with facial or throat swelling, difficulty breathing, or other signs of a severe allergic reaction.
8. Persistent Cough or Breathing Changes at Night
A cough that becomes more noticeable at night can have several explanations.
Acid reflux may irritate the throat when a person lies down. Postnasal drip can cause mucus to collect in the throat. Asthma symptoms may worsen during the night, and respiratory infections can produce prolonged coughing.
However, a persistent cough should be evaluated, particularly if it lasts for several weeks or is accompanied by other warning signs.
Lung cancer can cause a cough that does not go away, changes in an existing cough, coughing up blood, chest discomfort, or shortness of breath.
These symptoms are also associated with many other conditions, including infections, chronic lung disease, and heart problems.
A cough that produces blood should always be assessed promptly.
Other concerning symptoms include unexplained weight loss, persistent chest pain, increasing breathlessness, or repeated respiratory infections.
People who smoke or have a history of significant exposure to tobacco smoke may have a higher risk of lung cancer and should discuss appropriate screening and evaluation with their healthcare provider.
Do not wait for a cough to become severe before seeking advice if it is persistent or changing.
9. Unusual Bruising or Bleeding
Occasional bruises are common. They may appear after minor injuries that a person does not remember.
However, unexplained bruising, frequent nosebleeds, bleeding gums, or unusually heavy menstrual bleeding can sometimes indicate a problem with blood cells, platelets, or clotting.
Some blood cancers, including leukemia, affect the bone marrow, where blood cells are produced.
If the bone marrow cannot produce enough healthy platelets, the body may have difficulty stopping bleeding.
Other possible symptoms include:
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Persistent fatigue.
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Frequent infections.
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Pale skin.
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Fever.
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Small red or purple spots on the skin.
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Unusual bleeding.
These symptoms do not prove that someone has leukemia. Medication effects, nutritional deficiencies, immune disorders, and other conditions can cause similar problems.
Nevertheless, new unexplained bruising or bleeding should be medically assessed, particularly when several symptoms occur together.
Heavy bleeding, vomiting blood, black tarry stools, or bleeding that cannot be controlled requires urgent care.
10. Changes in Appetite and Difficulty Swallowing
Appetite can change for many reasons, including stress, infection, medication, digestive problems, and emotional health.
A temporary loss of appetite is usually not alarming.
However, persistent appetite loss, feeling full after eating very little, or unexplained difficulty swallowing may require investigation.
Some digestive system cancers can affect appetite, swallowing, digestion, or the ability to eat normally.
For example, cancers of the esophagus may cause progressive difficulty swallowing. Stomach and pancreatic cancers can sometimes cause persistent digestive discomfort, early fullness, or unexplained weight loss.