Cancer does not always cause clear symptoms in its early stages. Some changes may be discrete, persist for weeks and end up being attributed to more common problems. Therefore, observing unusual changes in the body's functioning can help identify situations that require medical evaluation.
Your body may give you these 10 signs before a cancer diagnosis
Cancer does not always cause clear symptoms in its early stages. Some changes may be discrete, persist for weeks and end up being attributed to more common problems. Therefore, observing unusual changes in the body's functioning can help...
The United States National Cancer Institute (NCI) emphasizes that symptoms associated with cancer are, in most cases, caused by other diseases or benign conditions. Still, he recommends seeing a doctor when an unexplained change persists for a few weeks.
- Unexplained weight loss Losing weight without changing your diet or exercise routine can occur for a variety of reasons, but it is also among the signs seen in some types of cancer.
- More attention should be paid when weight loss is significant, rapid or accompanied by other symptoms.
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The United States National Cancer Institute (NCI) emphasizes that symptoms associated with cancer are, in most cases, caused by other diseases or benign conditions. Still, he recommends seeing a doctor when an unexplained change persists for a few weeks.
See ten signs that deserve attention.
1. Unexplained weight loss
Losing weight without changing your diet or exercise routine can occur for a variety of reasons, but it is also among the signs seen in some types of cancer. More attention should be paid when weight loss is significant, rapid or accompanied by other symptoms.
2. Persistent abdominal bloating
Feeling a bloated belly occasionally is common. The warning appears when bloating becomes frequent, lasts a long time or appears together with pain, intestinal changes, weight loss or lack of appetite.
3. Newly appearing diabetes
A new discovery of diabetes is not, in itself, a sign of cancer. Research, however, shows an association between new-onset diabetes and pancreatic cancer in a small proportion of patients, especially when weight loss or other unexplained changes also occur.
4. Unusual bleeding or bruising
Bleeding without a known cause, blood in the urine or feces and frequent bruising are changes that should be investigated. The location and characteristics of the bleeding help the doctor determine possible causes.
5. Wound that doesn't heal
A lesion on the skin or in the mouth that does not improve also deserves attention. The NCI includes non-healing wounds among the changes that may be related to some types of cancer.
6. Persistent difficulty swallowing
Problems swallowing can have a variety of causes, including reflux and other digestive conditions. When the difficulty persists or progressively worsens, however, it is recommended to seek medical evaluation.
7. Cough or hoarseness that doesn't improve
A persistent cough or a change in voice that does not go away should be investigated, especially when accompanied by shortness of breath, blood when coughing, weight loss or a history of smoking.
8. Intense and prolonged tiredness
Fatigue that remains even after periods of rest and interferes with usual activities can have numerous causes, such as anemia, hormonal disorders and infections. It is also among the general symptoms described in some cancer patients.
9. Night sweats or fever with no apparent cause
Recurrent fever or heavy night sweats, especially when there is no known infection, should also be evaluated. These symptoms can occur in different diseases and are observed, for example, in some types of blood cancer.
10. Persistent loss of appetite
Feeling less desire to eat for a prolonged period, becoming full too quickly or losing weight unintentionally are changes that should not be ignored when they persist. Appetite changes appear among the possible general symptoms of cancer, although they are also common in many other conditions.
Does having one of these symptoms mean you have cancer?
No. Most of these signs are nonspecific and can be caused by much more common conditions. What deserves attention is a change that is not normal for that person, does not improve or becomes progressively more intense.
There is also no rule that these symptoms necessarily appear months before a diagnosis. There are more than 200 types of cancer, with very different manifestations and evolution.
Early identification, when possible, can increase the chances of effective treatment of various tumors.
Physical activity may help reduce cancer risk
In addition to paying attention to the body's signals, lifestyle habits play an important role in prevention. The World Health Organization considers physical inactivity to be one of the factors associated with the risk of cancer and estimates that a relevant portion of cases can be avoided with known prevention measures.
A study published in 2026 in the journal BMC Medicine analyzed data from 59,218 adults from the UK Biobank and followed participants for about eight years. The researchers evaluated a set of 13 types of cancer associated with physical activity and recorded 2,385 diagnoses during the period.
The results showed an association between spending more time moving and a lower risk of this set of cancers. In the statistical model, replacing 15 minutes of sedentary behavior with 15 minutes of movement was associated with a reduction of approximately 2% in the observed risk. Higher intensity activities showed the strongest associations.
Changes in nails can be a sign of lung cancer; understand
Known as digital clubbing, the increase in fingertips and the curvature of the nails may be related to lung, heart or inflammatory diseases. Changes without an apparent cause should be evaluated by a doctor