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Cancer is a group of diseases in which abnormal cells grow uncontrollably and may invade surrounding tissues or spread to other parts of the body. There are many different types of cancer, and their symptoms can vary depending on the organ or tissue affected. Importantly, having one or more of these symptoms does not automatically mean that a person has cancer. Many of them can be caused by infections, injuries, stress, or other medical conditions. However, persistent or unexplained symptoms should be discussed with a healthcare professional.

1. Unexplained Weight Loss

One possible warning sign of cancer is losing a significant amount of weight without deliberately changing your diet or exercise. Some cancers can affect appetite, metabolism, or the body's ability to use nutrients properly. Unexplained weight loss should be medically evaluated, particularly when it continues over time.

2. Persistent Tiredness

Extreme or persistent fatigue can occur with some cancers. This tiredness may not improve even after getting adequate sleep and rest. Cancer-related fatigue can result from the disease itself, anemia, nutritional problems, or the body's immune response. However, fatigue is extremely common and has many possible causes.

3. Unexplained Lumps or Swelling

A new lump, swelling, or thickening under the skin may sometimes be associated with cancer. Breast, testicular, lymph-node, and other cancers can present with noticeable lumps. Not every lump is cancerous; many are caused by cysts, infections, or other benign conditions. Nevertheless, a new or changing lump should be checked by a healthcare professional.

4. Unusual Bleeding

Unexplained bleeding can be an important warning sign. Examples include blood in the stool or urine, coughing up blood, vomiting blood, or unusual vaginal bleeding. The cause may be something other than cancer, but unexplained bleeding should not be ignored.

5. Changes in the Skin

Changes in the skin can sometimes indicate skin cancer. Watch for a new mole or a mole that changes in size, shape, or colour. A sore that does not heal, unusual bleeding or crusting, persistent itching, or other significant skin changes should be examined by a qualified healthcare professional.

6. Persistent Pain

Pain that is unexplained, persistent, worsening, or associated with other symptoms may require medical assessment. Cancer can sometimes cause pain by pressing on nerves, bones, or nearby organs. However, most pain is not caused by cancer, so persistent pain should be evaluated rather than assumed to be cancer.

7. Persistent Cough or Difficulty Breathing

A cough that does not go away, recurring chest discomfort, hoarseness, or unexplained shortness of breath can have many causes. In some cases, these symptoms may occur with cancers affecting the lungs or other parts of the respiratory system. A persistent or worsening cough should be assessed by a healthcare professional.

8. Changes in Bowel or Bladder Habits

Long-lasting changes such as persistent constipation or diarrhoea, changes in stool appearance, difficulty urinating, increased urinary frequency, or blood in the urine or stool may require investigation. These symptoms are often caused by non-cancerous conditions, but persistent changes should be discussed with a doctor.

9. Difficulty Swallowing or Persistent Indigestion

Ongoing difficulty swallowing, persistent heartburn, indigestion, abdominal discomfort, or changes in appetite can have numerous causes. If these symptoms persist, become severe, or occur alongside unexplained weight loss or bleeding, medical evaluation is important.

10. When Should You Seek Medical Help?

The most important lesson is not to panic, but not to ignore persistent changes in your body. Cancer symptoms can be subtle, and some cancers may cause few or no symptoms in their early stages. Screening tests can also detect certain cancers before symptoms appear.

If you notice an unusual symptom that persists, worsens, repeatedly returns, or cannot be explained, speak with a qualified healthcare professional. Early evaluation can help identify the cause and, when cancer is present, may allow treatment to begin earlier.

Remember: A symptom is a warning sign, not a diagnosis. Only appropriate medical evaluation and diagnostic testing can determine whether cancer is present.

“The prudent man foreseeth the evil, and hideth himself: but the simple pass on, and are punished.” — Proverbs 22:3