However, most persistent coughs and cases of hoarseness are not caused by cancer.
For example, reflux, vocal strain, smoking, allergies, and infections are common explanations.
If you have a cough that lasts more than three weeks, particularly if you smoke or have a history of lung disease, arrange a medical evaluation.
Seek urgent care if you experience significant breathing difficulty or cough up more than a small amount of blood.
7. Persistent Pain With No Clear Explanation
Pain is one of the body's most noticeable warning signals.
It can result from injury, inflammation, muscle strain, nerve problems, infections, and many other conditions.
Cancer may also cause pain, but not every cancer produces pain during its early stages.
Some tumors can grow for a considerable period before pressing on nearby organs, bones, nerves, or other structures.
Depending on the location, cancer-related pain may occur in different parts of the body.
Examples include:
Persistent abdominal pain: This may occur with conditions affecting the stomach, intestines, pancreas, liver, or other abdominal organs.
Unexplained bone pain: Certain cancers that begin in the bones or spread to the bones may cause ongoing discomfort.
Persistent headaches: Some brain tumors can cause headaches, sometimes accompanied by seizures, vomiting, weakness, or changes in vision.
Chest pain: Lung or other chest-related conditions may cause persistent discomfort, although heart and lung diseases are also important possibilities.
Pelvic pain: Persistent pelvic discomfort can have many causes, including gynecological and urinary conditions.
The pattern of pain matters.
Pay attention if pain is persistent, progressively worsening, repeatedly wakes you from sleep, or occurs alongside other unexplained changes.
However, the severity of pain does not reliably indicate whether cancer is present.
A mild but persistent symptom may deserve evaluation, while severe pain may have a completely noncancerous cause.
The best approach is to identify the underlying reason rather than attempting to diagnose yourself based on where it hurts.
8. Skin Changes, New Moles, or Sores That Do Not Heal
Your skin can reveal changes that deserve attention.
Many skin conditions are harmless, but certain changes may be associated with skin cancer.
One of the most important warning signs is a new or changing spot, mole, or skin growth.
Melanoma, a potentially serious form of skin cancer, can develop in an existing mole or appear as a new spot.
A useful guide for evaluating suspicious moles is the ABCDE rule.
A β Asymmetry: One half of the mole looks different from the other half.
B β Border: The edges are irregular, uneven, or poorly defined.
C β Color: The mole contains different shades or uneven colors.
D β Diameter: The spot is larger than approximately 6 millimeters, although melanomas can also be smaller.
E β Evolving: The mole changes in size, shape, color, or appearance over time.
Other skin warning signs include:
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A sore that does not heal.
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A spot that repeatedly bleeds or forms a crust.
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A new growth that continues enlarging.
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A persistent rough or scaly patch.
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A change in the appearance of an existing skin lesion.
Not every unusual mole is melanoma, and some skin cancers do not follow the classic ABCDE pattern.
For example, certain skin cancers may appear as pearly bumps, persistent scaly patches, or sores that repeatedly heal and reopen.
People with significant sun exposure, a history of sunburn, or a family history of melanoma may have increased risk.
Protecting your skin from excessive ultraviolet exposure and paying attention to new or changing lesions are important habits.
If you notice a suspicious skin change, arrange a dermatological examination rather than waiting for it to disappear.
9. Difficulty Swallowing or Persistent Digestive Discomfort
Occasional difficulty swallowing may happen when you eat too quickly, take a large bite, or experience temporary throat irritation.
However, persistent or progressively worsening difficulty swallowing should be evaluated.
This symptom is known medically as dysphagia.
Some cancers involving the throat, esophagus, or nearby structures can make swallowing difficult.
A person may initially struggle with solid foods and later notice difficulty swallowing liquids.
Other possible symptoms include:
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Pain when swallowing.
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A persistent sensation that food is stuck.
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Frequent choking or coughing while eating.
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Unexplained weight loss.
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Persistent throat discomfort.
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Recurrent vomiting.
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Ongoing indigestion.
Certain stomach or esophageal cancers may also cause early fullness, persistent upper abdominal discomfort, nausea, or difficulty eating normal portions.
However, these symptoms are much more commonly associated with noncancerous conditions.
Acid reflux, esophageal inflammation, ulcers, swallowing disorders, and medication effects can all contribute to similar problems.
If swallowing becomes progressively more difficult, food repeatedly feels stuck, or you are losing weight because eating has become uncomfortable, seek medical advice promptly.
If food becomes completely lodged and you cannot swallow saliva, seek emergency care.