Frequently Asked Questions About Cancer: Causes, Symptoms, Stages and Treatment

1. Who Gets Cancer?

Anyone can develop cancer, although the risk generally increases with age. Your risk depends on several factors, including smoking, lifestyle choices, diet, physical activity, family history, workplace exposures, and environmental factors. Certain infections and inherited genetic changes can also increase the risk of developing specific types of cancer.

2. How Does Cancer Start?

The human body is made up of many different types of cells. Under normal conditions, cells grow, divide, age, and die. In most cases, old or damaged cells are replaced by new ones. However, changes in the DNA of a cell can sometimes disrupt this process, causing cells to grow and divide uncontrollably.

These abnormal cells may form a mass called a tumour. Tumours can be benign (noncancerous) or malignant (cancerous). Malignant tumours can invade nearby tissues and, in some cases, spread to other parts of the body through the blood or lymphatic system. This process is known as metastasis.

3. Is Cancer Genetic?

Cancer develops because of changes in genes that control how cells grow, divide, and function. Some of these genetic changes are inherited from parents, while others occur during a person's lifetime because of ageing, environmental exposures, lifestyle factors, or random errors when cells divide.

Only a minority of cancers are associated with inherited genetic changes that significantly increase cancer risk. If you have a strong family history of cancer or relatives who developed cancer at an unusually young age, your doctor may recommend genetic counselling and, when appropriate, genetic testing.

4. Is Cancer Contagious?

No. Cancer itself is not contagious. You cannot catch cancer by touching, hugging, kissing, sharing food, or spending time with someone who has cancer.

However, certain infections, including human papillomavirus (HPV) and hepatitis B virus (HBV), can increase the risk of developing particular cancers. These infections can spread between people, but cancer itself does not.

5. Is There a Vaccine for Cancer?

There is currently no single vaccine that prevents or treats every type of cancer. However, vaccines are available against certain viruses that can cause cancer, helping reduce the risk of some cancers.

• Human Papillomavirus (HPV) Vaccine: HPV infection is associated with cervical, anal, penile, vulvar, vaginal, and some throat cancers. HPV vaccination helps protect against the HPV types responsible for many of these cancers.
• Hepatitis B Vaccine: Chronic hepatitis B infection can cause liver damage and increase the risk of liver cancer. Vaccination helps prevent hepatitis B infection and reduces the risk of associated liver cancer.

These vaccines protect against specific infections that can lead to cancer; they do not prevent every type of cancer. Consult your healthcare professional about the recommended vaccination schedule for you or your family.

6. Can Cancer Be Cured?

Yes. Many cancers can be cured, particularly when diagnosed at an early stage. However, the possibility of a cure depends on the type of cancer, its stage, its biological characteristics, and how it responds to treatment.

When cancer treatment is effective, your doctor may describe the cancer as being in remission:

• Partial Remission: The cancer has decreased in size or extent, but some evidence of the disease remains.
• Complete Remission: No signs of cancer can currently be detected using the available tests. This does not always mean that every cancer cell has been eliminated.

The longer a cancer remains in complete remission, the more encouraging the outlook may be, although the risk of recurrence varies by cancer type. Your oncologist can explain your response to treatment, the likelihood of recurrence, and the follow-up care you may need.

7. What Are the Stages of Cancer, and What Do They Mean?

Many cancers are classified into four main stages, from Stage I to Stage IV. Staging helps doctors understand the extent of cancer and plan appropriate treatment. The exact criteria vary depending on the type of cancer.

• Stage I: Cancer is generally limited in size and extent and may be confined to the organ where it started. It is often considered an early stage.
• Stages II and III: Cancer may be larger, may have grown into nearby tissues, or may have spread to nearby lymph nodes. The precise meaning depends on the cancer type.
• Stage IV: Cancer has spread to distant organs or other parts of the body. This is commonly called metastatic cancer.

Not every cancer uses the same four-stage system. Some blood cancers and other cancer types have different classification systems. Your doctor can explain what your specific stage means and how it affects treatment options and prognosis.

8. Does Cancer Have Symptoms?

Sometimes, but not always. Cancer symptoms depend on the type of cancer, its location, and how much it has grown. Some cancers may not cause noticeable symptoms until they have progressed, while others may cause changes at an earlier stage.

Possible signs and symptoms of cancer include:

• Unexplained weight loss.
• Persistent or recurrent fever without a clear cause.
• Unusual or ongoing fatigue.
• Persistent or unexplained pain.
• Changes in the skin, including yellowing, darkening, or redness.
• Changes in bowel habits or bladder function.
• Sores that do not heal.
• Unusual bleeding or discharge.
• A lump or thickening in any part of the body, including the breast.
• Persistent indigestion or difficulty swallowing.
• A recent change in the appearance of a mole, wart, or other skin lesion.
• A persistent cough or hoarseness.

These symptoms can occur for many reasons, and having one or more of them does not necessarily mean you have cancer. However, if a symptom is unexplained, persists, worsens, or is unusual for you, consult your doctor. Appropriate medical evaluation can help identify the cause and determine whether further testing is needed.

9. How Do Cancer Drugs Work?

Different cancer treatments work in different ways. Your oncologist selects treatment according to the cancer type, stage, and other individual factors. Common types of cancer drug treatments include:

• Chemotherapy: Uses medicines to destroy cancer cells or stop them from growing and dividing. Some chemotherapy drugs can also affect healthy cells, which may cause side effects such as nausea, fatigue, hair loss, and a reduced blood cell count.
• Targeted Therapy: Targets specific proteins, genes, or other features that help cancer cells grow and survive. These medicines may affect healthy cells differently from traditional chemotherapy, but they can still cause side effects.
• Immunotherapy: Helps the immune system recognise or fight cancer cells. Different immunotherapies work in different ways and may cause immune-related side effects.

Other cancer treatments include surgery, radiation therapy, hormone therapy, and stem cell transplantation for selected conditions. Some patients receive a combination of treatments. Your healthcare team can explain the potential benefits, risks, and side effects of your treatment plan.

10. When Should I Get Tested for Cancer?

Cancer screening recommendations vary according to the type of cancer, your age, family history, personal medical history, and other risk factors. Screening is intended to detect certain cancers or precancerous changes before symptoms develop.

It is a good idea to discuss cancer screening with your doctor to determine which tests are appropriate for you and when you should have them. Depending on your circumstances, recommended screening may include tests for breast, cervical, or colorectal cancer, among others.

If you have symptoms that could indicate cancer, consult your doctor rather than waiting for a routine screening appointment. Screening recommendations are intended for people without relevant symptoms, while symptoms may require diagnostic evaluation.

Conclusion

Understanding cancer, its causes, symptoms, stages, and treatment options can help you make informed decisions about your health. Although a cancer diagnosis can be worrying, advances in screening, diagnosis, and treatment have improved outcomes for many patients.

If you have concerns about cancer or your personal risk, consult a qualified healthcare professional. Early medical evaluation, appropriate screening, and a personalised treatment plan can play an important role in cancer care.