Understanding the Major Types of Cancer

Head and Neck Cancer

Head and neck cancer refers to a group of cancers that develop in the mouth, throat, voice box, salivary glands, nose or sinuses. Most cases begin in the flat cells lining these areas and are strongly linked to tobacco use, heavy alcohol consumption or infection with the human papillomavirus (HPV), with the risk rising sharply when tobacco and alcohol use combine.

It is often first noticed as a persistent sore or lump that doesn’t heal, a change in voice, difficulty swallowing, or a swelling in the neck that lasts more than a few weeks. Diagnosis typically involves a physical examination, imaging such as a CT or MRI scan, and a biopsy to confirm the cell type. Treatment depends heavily on the exact location and stage, and can range from surgery alone for smaller, well contained tumours to a combination of surgery, radiation and chemotherapy for more advanced disease.

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Thyroid Cancer

Thyroid cancer begins in the thyroid gland, a small butterfly shaped gland at the base of the neck that regulates metabolism through hormone production. It is usually discovered incidentally, often as a nodule picked up on a routine ultrasound or scan performed for an unrelated reason, rather than through symptoms. Risk factors include prior radiation exposure to the head or neck, a family history of thyroid cancer, and certain inherited genetic syndromes, though many cases have no clear identifiable cause.

Diagnosis relies on ultrasound imaging followed by a fine needle aspiration biopsy to determine whether a nodule is benign or malignant. The good news is that most forms of thyroid cancer, particularly papillary and follicular types, are highly treatable with surgery, and long term outcomes are generally excellent when the disease is caught early.

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Breast Cancer

Breast cancer develops when cells in the breast tissue begin to grow uncontrollably, most commonly starting in the ducts or lobules that produce and carry milk. It is one of the most common cancers affecting women worldwide, though it can occur in men in rare cases. Risk increases with age, a family history of breast or ovarian cancer, inherited genetic mutations such as BRCA1 or BRCA2, and hormonal factors including early menstruation or late menopause. It is often first detected as a lump found during self-examination or screening, though changes in breast shape, skin texture or nipple discharge can also be early signs.

Diagnosis usually involves imaging such as mammography or ultrasound followed by a biopsy, and treatment options range from breast conserving surgery to mastectomy, often combined with radiation, chemotherapy or hormone therapy depending on the cancer’s type and stage.

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Lung Cancer

Lung cancer originates in the cells lining the airways or air sacs of the lungs and is strongly associated with long term tobacco smoking, though it does occur in people who have never smoked, particularly due to exposure to radon gas, asbestos or air pollution. Early stage lung cancer often produces no noticeable symptoms, which is why it tends to be diagnosed at a more advanced stage once symptoms such as a persistent cough, unexplained weight loss, chest pain or coughing up blood appear.

Diagnosis typically involves imaging such as a CT scan followed by a biopsy, and in some regions low dose CT screening is recommended for people at high risk. Treatment depends on the specific type of lung cancer and how far it has spread, and may involve surgery, radiation, chemotherapy, targeted therapy or immunotherapy, often used in combination.

Colorectal Cancer

Colorectal cancer develops in the colon or rectum, usually starting as a small growth called a polyp that can turn cancerous over time if left undetected. Risk rises with age, and is also influenced by diet, particularly one low in fibre and high in processed or red meat, as well as family history, inflammatory bowel disease and certain inherited genetic conditions.

Common warning signs include a persistent change in bowel habits, blood in the stool, unexplained weight loss and abdominal discomfort, although early stage disease can be entirely symptom free. This is why routine screening, typically through colonoscopy, is so effective, since it can detect and remove precancerous polyps before they ever become cancerous. When caught early, colorectal cancer has a high cure rate, with treatment usually centred on surgical removal, sometimes combined with chemotherapy for more advanced cases.

Skin Cancer

Skin cancer covers several distinct conditions, the most common being basal cell carcinoma and squamous cell carcinoma, both of which are highly treatable, and melanoma, which is less common but more likely to spread if not caught early. The primary risk factor across all types is cumulative exposure to ultraviolet light, whether from the sun or from tanning beds, with fair skin, a history of sunburns and a family history of skin cancer further increasing risk. Basal and squamous cell carcinomas often appear as a persistent sore, a scaly patch or a shiny bump, while melanoma is more commonly identified through changes in an existing mole or the appearance of a new, irregularly shaped or coloured spot.

Diagnosis is usually made through a skin examination followed by a biopsy of the suspicious area. Treatment for most skin cancers involves surgical removal, and outcomes are excellent when detected while still localised to the skin.

Oral Cancer

Oral cancer is a form of head and neck cancer that specifically affects the lips, tongue, gums, the floor of the mouth or the inner lining of the cheeks. It is strongly linked to tobacco use in all its forms, including chewing tobacco and areca nut products, as well as heavy alcohol consumption, with the combination of both substantially increasing risk. Early signs can include a mouth ulcer that doesn’t heal within a few weeks, a persistent white or red patch inside the mouth, unexplained bleeding, or a lump that can be felt in the cheek or under the jaw.

Diagnosis is confirmed through a physical examination and biopsy, sometimes supported by imaging to assess how far the disease has spread. Treatment for smaller, localised tumours often involves a single well contained surgical procedure, while larger tumours may require more extensive surgery with reconstruction, sometimes alongside radiation.

Cervical Cancer

Cervical cancer develops in the cells of the cervix, the lower part of the uterus that connects to the vagina, and is very closely linked to persistent infection with certain high risk strains of the human papillomavirus (HPV). Other contributing factors include smoking, a weakened immune system and long term use of oral contraceptives, though HPV infection remains the dominant cause in the vast majority of cases. In its early stages, cervical cancer typically causes no symptoms at all, which is why regular screening through Pap smears and HPV testing has been so effective at reducing both its incidence and mortality in populations where screening is widely practised.

When symptoms do appear, they can include abnormal vaginal bleeding or discharge and pelvic pain. Treatment depends on the stage at diagnosis and can range from a minor procedure to remove abnormal cells to surgery, radiation or chemotherapy for more advanced disease.

Blood Cancers (Leukaemia and Lymphoma)

Blood cancers are a group of cancers that affect the blood cells or the lymphatic system rather than forming a single solid tumour, with leukaemia affecting the blood and bone marrow and lymphoma affecting the lymph nodes and lymphatic tissue. Their exact causes are often unclear, though certain genetic conditions, prior radiation or chemotherapy exposure, and specific viral or bacterial infections have been linked to increased risk in some cases.

Because these cancers don’t present as a visible lump, symptoms tend to be more general and easy to overlook, including persistent fatigue, unexplained weight loss, night sweats, easy bruising or bleeding, and swollen lymph nodes in the neck, armpit or groin.

Diagnosis usually involves blood tests, a bone marrow biopsy, or a lymph node biopsy, sometimes supported by imaging to assess the extent of disease. Treatment varies considerably by subtype and can include chemotherapy, targeted therapy, immunotherapy, radiation or stem cell transplantation.

Prostate Cancer

Prostate cancer develops in the prostate gland, a small gland in men that produces part of the fluid in semen, and is one of the most commonly diagnosed cancers in older men. It tends to grow slowly in many cases, and risk increases significantly with age, a family history of prostate cancer, and certain genetic factors, with some men living for years with a slow growing form that never causes symptoms or requires treatment. Many cases are detected through routine screening using a PSA (prostate specific antigen) blood test before any symptoms develop, though more advanced disease can cause urinary difficulties, blood in the urine or semen, or pelvic discomfort.

Diagnosis is confirmed through further testing such as an MRI scan and a biopsy of the prostate. Treatment options range from active surveillance for slow growing, low risk cancers to surgery, radiation or hormone therapy for cancers that require more active management.