Seek urgent care for severe abdominal pain, persistent vomiting, or marked abdominal swelling accompanied by an inability to pass stool or gas.
There is no single home test that can determine whether bloating is cancer-related. A healthcare professional may use a physical examination, blood tests, ultrasound, or other investigations depending on the overall picture.
9. Skin Changes, Including a New or Changing Mole
The skin can reveal changes that deserve medical attention, although many skin conditions are harmless.
A new mole, a changing spot, a sore that repeatedly bleeds, or a wound that does not heal may sometimes be associated with skin cancer.
Melanoma is one type of skin cancer that can develop in an existing mole or appear as a new pigmented spot. It can occur in areas that receive substantial sun exposure, but it can also develop in less obvious locations, including the soles of the feet, beneath the nails, or other areas not regularly exposed to sunlight.
One useful way to remember warning signs is the ABCDE guide:
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A — Asymmetry: One half of a mole looks different from the other.
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B — Border: The edges are irregular, blurred, or poorly defined.
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C — Color: The spot contains multiple colors or develops an unusual color change.
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D — Diameter: The spot is larger than about 6 millimeters, although melanomas can be smaller.
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E — Evolving: The spot changes in size, shape, color, elevation, or symptoms over time.
Not every melanoma displays all these features. Some skin cancers are pink, red, or skin-colored rather than dark brown or black. A new or changing lesion can still be concerning even if it does not fit the classic description.
Other possible warning signs include a sore that fails to heal, a rough or scaly patch that persists, repeated crusting, unexplained bleeding, or a growth that continues to enlarge.
Skin cancer risk can be influenced by ultraviolet exposure, a history of sunburn, family history, certain immune conditions, and other factors. However, anyone can develop skin cancer.
What should you do?
Have a new, changing, bleeding, or nonhealing skin lesion examined by a healthcare professional. A clinician may recommend dermoscopy or a biopsy if the appearance is suspicious.
Taking occasional photographs of a mole can help document changes, but photographs cannot replace medical evaluation.
Do not attempt to remove or burn off a suspicious lesion at home. The correct diagnosis matters because different skin conditions require different treatments.
10. Night Sweats, Persistent Fever, or Recurrent Unexplained Infections
Waking up warm after sleeping under heavy blankets is common. Night sweats can also occur because of hormonal changes, medications, infections, or other noncancerous conditions.
The pattern becomes more concerning when sweating is repeatedly severe enough to soak clothing or bedding despite a cool sleeping environment, especially when accompanied by persistent fever, unexplained weight loss, or swollen lymph nodes.
Certain blood cancers, including lymphoma and leukemia, can cause systemic symptoms such as fever, drenching night sweats, and weight loss. These are sometimes called constitutional symptoms.
However, these symptoms are not specific to cancer. Tuberculosis and other infections, autoimmune diseases, medication effects, and hormonal disorders can produce similar problems.
Recurrent or unusually persistent infections may also deserve investigation. Leukemia and some other blood disorders can interfere with the production or function of healthy white blood cells, making it harder for the body to fight certain infections.
A person might experience repeated infections, prolonged recovery, unexplained fever, unusual bruising, or persistent fatigue. The combination of symptoms may be more informative than any one symptom alone.
It is important not to interpret ordinary seasonal infections as evidence of cancer. Most people who experience repeated colds or occasional night sweats do not have a malignant disease.
The concern is a pattern that is persistent, unexplained, unusually severe, or accompanied by other changes in health.
When should you seek medical attention?
Arrange an appointment if you have recurrent drenching night sweats, persistent unexplained fever, repeatedly swollen lymph nodes, or infections that are unusually severe or difficult to resolve.
Seek urgent medical care if you develop a severe infection with confusion, difficulty breathing, fainting, or other signs of serious illness.
Depending on your symptoms, a doctor may recommend blood tests, an examination of the lymph nodes, or additional investigations.
The goal is to identify the underlying cause rather than assume that fever or sweating automatically signals cancer.
Why These Symptoms Are Easy to Miss
One reason cancer symptoms can be overlooked is that many resemble everyday health problems.
Fatigue is common after a difficult week. Bloating may follow a meal. A cough can linger after a cold. A mole may look different because of a harmless skin condition.
When symptoms appear gradually, people may adjust to them without realizing that something has changed.
They might eat smaller meals because they feel full quickly, avoid certain foods because swallowing feels uncomfortable, or attribute declining energy to age or stress. Sometimes, family members notice the changes before the person experiencing them does.
Another challenge is fear.
Some people delay seeking medical advice because they worry about receiving bad news. Others assume that a symptom must be severe before it deserves attention.
But seeking medical advice does not mean assuming that you have cancer. It means allowing a qualified professional to determine whether the symptom has a treatable cause, requires monitoring, or needs further investigation.