Cancer can sometimes develop silently, without causing obvious symptoms in its early stages. However, the body may occasionally show warning signs that deserve attention.
It’s important to remember that having one or more of these symptoms does not mean you have cancer. Many of them are caused by infections, hormonal changes, digestive problems, stress, or other non-cancerous conditions. Still, persistent or unexplained changes should be discussed with a healthcare professional.
Here are 16 potential warning signs that shouldn’t be ignored.
1. Unexplained Weight Loss
Losing weight without changing your diet or exercise routine can sometimes be a warning sign. Unintentional weight loss may occur with several types of cancer, but it can also result from thyroid problems, digestive disorders, infections, or other conditions.
If you are losing weight without trying, especially if the loss is significant or continues over time, speak with a doctor.
2. Persistent or Unusual Fatigue
Everyone feels tired from time to time. But fatigue that doesn’t improve with adequate sleep and rest may deserve medical attention.
Some cancers can cause fatigue because the disease affects the body’s normal functions or because of anemia and other changes in the body.
3. An Unexplained Lump or Swelling
A new lump, swelling, or thickened area anywhere on the body should be checked, particularly if it persists or grows.
Not every lump is cancerous. Cysts, infections, swollen lymph nodes, and benign growths are common causes. A healthcare professional can determine whether further testing is necessary.
4. Changes in the Skin
Changes in the skin can sometimes be associated with skin cancer or other diseases.
Pay attention to a new mole or a mole that changes in size, shape, color, or appearance. Also seek medical advice for a sore that doesn’t heal, unusual bleeding, or persistent changes in the skin.
5. Unusual Bleeding
Bleeding that has no obvious explanation should not be ignored.
Examples include blood in the stool or urine, coughing up blood, or unusual vaginal bleeding. Although these symptoms can have many causes, persistent or unexplained bleeding warrants medical evaluation.
6. Changes in Bowel Habits
A lasting change in bowel habits can include:
- Persistent diarrhea
- Ongoing constipation
- Changes in stool appearance
- A feeling that the bowel hasn’t completely emptied
- More frequent or less frequent bowel movements
Temporary changes are common, but persistent changes should be discussed with a healthcare professional.
7. Persistent Changes in Urination
Changes such as needing to urinate more frequently, difficulty urinating, pain during urination, or blood in the urine can have many causes.
Urinary infections and prostate problems are common explanations, but persistent symptoms should be evaluated rather than ignored.
8. A Persistent Cough or Hoarseness
A cough caused by a cold or respiratory infection usually improves with time. A cough or hoarseness that persists, worsens, or occurs alongside other concerning symptoms should be checked by a healthcare professional.
Coughing up blood requires prompt medical attention.
9. Difficulty Swallowing
Persistent difficulty swallowing, sometimes called dysphagia, can occur for many reasons, including acid reflux and other digestive conditions.
If swallowing problems continue, worsen, or are accompanied by unexplained weight loss or other symptoms, seek medical advice.
10. Persistent Abdominal Pain or Bloating
Occasional bloating or abdominal discomfort is common. However, persistent or unexplained abdominal pain, swelling, or bloating should be evaluated.
The cause may be digestive, hormonal, inflammatory, or related to another condition, so medical assessment is important.
11. Persistent Indigestion or Heartburn
Occasional heartburn is common, especially after certain meals. But persistent indigestion, recurring heartburn, or ongoing discomfort should not simply be ignored.
A doctor can determine whether the symptoms are related to reflux or another condition requiring treatment.
12. Recurrent Fever or Night Sweats
Fever is usually associated with infections, but unexplained or recurrent fever can have several possible causes.
Similarly, regularly waking up with unusually heavy night sweats may warrant medical evaluation, particularly when accompanied by unexplained weight loss, persistent fatigue, or swollen lymph nodes.
13. Persistent Pain With No Clear Cause
Pain that continues without an obvious explanation should be evaluated, especially if it is new, worsening, or interfering with normal activities.
Cancer is only one possible cause of persistent pain, so it’s important not to assume the cause without a proper medical assessment.
14. Changes in Breast Appearance
Changes in the breast can include:
- A new lump
- Thickening of breast tissue
- Changes in breast size or shape
- Changes in the nipple
- Nipple discharge
- Changes in the skin over the breast
Many breast changes are not cancerous, but a new or unusual change should be checked by a healthcare professional.
15. Mouth Changes That Don’t Heal
A sore, ulcer, lump, thickened area, or unusual patch in the mouth that doesn’t heal should be examined.
This is particularly important when changes persist or are accompanied by pain, difficulty swallowing, or other unusual symptoms.
16. A Change in an Existing Mole or Skin Growth
One useful way to monitor moles is to remember the ABCDE warning signs:
A — Asymmetry: One half doesn’t match the other.
B — Border: The edges are irregular, uneven, or poorly defined.
C — Color: The color is uneven or changing.
D — Diameter: The mole is becoming larger, particularly if it is larger than about 6 mm.
E — Evolving: The mole is changing in size, shape, color, or appearance.
A changing mole doesn’t automatically mean melanoma, but it should be assessed by a qualified healthcare professional.
When Should You See a Doctor?
Don’t panic if you notice one of these symptoms. Most of these signs can be caused by conditions other than cancer.
However, it’s a good idea to seek medical advice when a symptom:
- Persists or keeps returning
- Gets progressively worse
- Has no obvious explanation
- Is accompanied by unexplained weight loss or significant fatigue
- Causes unusual bleeding
- Produces a new lump or swelling
- Represents a significant change from what is normal for you
Early evaluation can help identify the cause and, when necessary, allow treatment to begin sooner.
Final Thoughts
Knowing the possible warning signs of cancer can help you pay attention to changes in your body. But symptoms alone cannot diagnose cancer.
If you notice a persistent or unusual change, don’t try to diagnose yourself based on an online article. Talk with a healthcare professional who