Survival has improved dramatically: the 5‑year relative survival for all cancers combined in the U.S. increased from 49 % (1975‑1977) to 68 % (2018‑2020) due to earlier detection and better therapies.¹

Symptoms

Because cancer can arise in any organ, symptoms are diverse. Below is a comprehensive list organized by system. If you notice a new, persistent, or worsening symptom, discuss it with a health professional.

General (Systemic) Symptoms

• Unexplained weight loss: losing >10 % of body weight without trying.
• Fatigue: severe tiredness that does not improve with rest.
• Fever: recurring low‑grade fevers, especially at night.
• Night sweats: drenching sweats that soak clothing.
• Pain: persistent pain that may be localized (e.g., bone pain) or diffuse.
• Cachexia: muscle wasting often seen in advanced disease.

Head & Neck

• Sore throat, hoarseness, or trouble swallowing.
• Persistent ear pain or ringing.
• Unexplained lumps or swelling in the neck.
• Dental pain or loose teeth without dental disease.

Chest & Upper Abdomen

• Persistent cough or coughing up blood.
• Shortness of breath, wheezing, or chest pain that worsens with deep breaths.
• Heartburn or difficulty swallowing that does not improve.
• Unexplained fullness or a feeling of a “balloon” in the abdomen.

Breast

• Lump or thickening in breast or underarm.
• Skin changes – dimpling, redness, or “peau d’orange.”
• Nipple discharge (especially bloody) or inversion.

Gastrointestinal

• Changes in bowel habits – diarrhea, constipation, or narrower stools.
• Blood in stool or black/tarry stools.
• Persistent abdominal pain or cramping.
• Feeling full quickly after eating.

Genitourinary

• Painful or frequent urination.
• Blood in urine.
• Pelvic pain or an unexplained mass.
• Changes in libido or erectile dysfunction.

Skin

• A new mole or change in an existing mole (Asymmetry, Border, Color, Diameter, Evolution – ABCDE rule).
• Non‑healing ulcer or sore.
• Redness, scaling, or thickening of skin.

Causes and Risk Factors

Cancer develops when DNA damage accumulates faster than the body can repair it. Mutations may be inherited, induced by environmental exposures, or arise spontaneously.

Genetic and Hereditary Factors

• Inherited gene mutations (e.g., BRCA1/2 for breast/ovarian cancer, APC for familial adenomatous polyposis).
• Family history of specific cancers increases risk 2‑3‑fold.

Lifestyle‑Related Risks

• Tobacco use: causes ~30 % of cancer deaths in the U.S.; risk is dose‑dependent.²
• Alcohol: >2 drinks/day raises risk for oral, liver, breast, and colorectal cancers.
• Obesity & poor diet: high‑fat, low‑fiber diets linked with colorectal, pancreatic, and endometrial cancers.
• Physical inactivity: sedentary lifestyle raises risk for breast and colon cancer.
• Sun exposure & tanning beds: primary cause of melanoma and non‑melanoma skin cancers.

Environmental & Occupational Exposures

• Carcinogenic chemicals (asbestos, benzene, formaldehyde).
• Ionizing radiation (radiographic imaging, radon gas).
• Infections: HPV (cervical, oropharyngeal), Hepatitis B/C (liver), H. pylori (stomach), EBV (nasopharyngeal, certain lymphomas).

Other Factors

• Chronic inflammation (e.g., ulcerative colitis → colon cancer).
• Hormonal influences (estrogen exposure and breast cancer).
• Age – DNA repair mechanisms decline with age.

Diagnosis

Early, accurate diagnosis improves outcomes. The diagnostic pathway typically involves a combination of clinical evaluation, imaging, laboratory tests, and tissue sampling.

Initial Evaluation

• Medical History & Physical Exam: focuses on symptom chronology, risk factors, and palpable masses.
• Screening Tests: e.g., mammography, colonoscopy, low‑dose CT for lung cancer in heavy smokers, Pap smear/HPV testing.

Imaging Studies

• Ultrasound: first‑line for breast, thyroid, and abdominal lesions.
• Computed Tomography (CT): evaluates tumor size, local invasion, and distant spread.
• Magnetic Resonance Imaging (MRI): superior for brain, spinal cord, and soft‑tissue sarcomas.
• Positron Emission Tomography (PET): functional imaging to detect metabolically active disease and guide staging.
• Bone Scan: identifies skeletal metastases.

Laboratory Tests

• Complete Blood Count (CBC): anemia, leukocytosis, or thrombocytopenia can signal marrow involvement.
• Serum Tumor Markers: PSA (prostate), CA‑125 (ovarian), CEA (colon), AFP (liver), though markers are adjuncts, not definitive.

Pathology (Tissue Diagnosis)

• Biopsy: core needle, fine‑needle aspiration, excisional, or endoscopic biopsy.
• Histopathology: determines cancer type, grade, and histologic pattern.
• Molecular & Genetic Testing: next‑generation sequencing, HER2/ER/PR status, KRAS, BRAF, MSI‑H, and PD‑L1 expression—critical for targeted therapy decisions.

Staging

The American Joint Committee on Cancer (AJCC) TNM system (Tumor size, Node involvement, Metastasis) is most widely used. Accurate staging guides treatment intent (curative vs. palliative) and prognosis.

Treatment Options

Treatment is individualized based on cancer type, stage, molecular features, patient health, and preferences. Multidisciplinary care (oncology, surgery, radiation, supportive services) yields the best outcomes.

Surgical Management

• Curative resection of localized tumors (e.g., lumpectomy, colectomy, mastectomy).
• Debulking surgery to reduce tumor burden when complete removal isn’t possible.
• Minimally invasive techniques (laparoscopy, robotic surgery) reduce recovery time.

Radiation Therapy

• External Beam Radiation (EBRT): high‑energy photons/electrons target the tumor.
• Intensity‑Modulated Radiation Therapy (IMRT) & Image‑Guided Radiation Therapy (IGRT): spare normal tissue.
• Brachytherapy: internal radioactive sources placed near the tumor (prostate, cervical cancer).

Systemic Therapies

• Chemotherapy: cytotoxic drugs (e.g., paclitaxel, carboplatin) that kill rapidly dividing cells.
• Targeted Therapy: agents that inhibit specific molecular pathways (e.g., trastuzumab for HER2‑positive breast cancer, osimertinib for EGFR‑mutant lung cancer).
• Immunotherapy: checkpoint inhibitors (pembrolizumab, nivolumab) and CAR‑T cell therapy enhance the immune response.
• Hormone Therapy: tamoxifen, aromatase inhibitors for hormone‑receptor‑positive breast cancer; androgen deprivation for prostate cancer.
• Stem Cell/Bone Marrow Transplant: used for certain leukemias and lymphomas.

Supportive & Palliative Care

• Anti‑emetics, pain control, nutrition support, psychosocial counseling.
• Early integration of palliative care improves quality of life and, in some cancers, survival.³

Lifestyle Adjuncts

• Smoking cessation, balanced diet rich in fruits/vegetables, regular exercise.
• Vaccinations: HPV vaccine (prevents cervical, oropharyngeal cancers) and Hepatitis B vaccine (reduces liver cancer risk).

Living with Cancer

Daily management extends beyond medical treatment. Below are practical tips for patients and caregivers.

• Medication Management: use a pill organizer, keep an up‑to‑date medication list, and discuss side‑effect mitigation with your oncology team.
• Fatigue Management: schedule rest periods, prioritize tasks, and consider gentle aerobic activity (e.g., walking 10‑15 min 2‑3 times/week).
• Nutrition: aim for 1.2–1.5 g protein/kg body weight daily; small frequent meals can help with loss of appetite.
• Skin Care: for patients receiving radiation, protect treated areas from sun and use fragrance‑free moisturizers.
• Emotional Health: join support groups, seek counseling, practice mindfulness or relaxation techniques.
• Financial & Legal Planning: consult a social worker about insurance, disability benefits, and advance directives.
• Follow‑up Schedule: adhere to post‑treatment surveillance (imaging, labs) as recommended—early detection of recurrence improves salvage options.

Prevention

While not all cancers are preventable, risk reduction is achievable through evidence‑based actions.

• Tobacco Control: quit smoking and avoid secondhand smoke. Resources: quitlines, nicotine replacement, counseling.
• Alcohol Moderation: ≤1 drink/day for women, ≤2 drinks/day for men.
• Healthy Weight & Activity: maintain BMI 18.5–24.9; ≥150 min moderate aerobic activity weekly.
• Diet: emphasize whole grains, legumes, berries, cruciferous vegetables; limit processed meats and sugary beverages.
• Sun Safety: use broad‑spectrum SPF 30+ sunscreen, wear protective clothing, avoid peak UV hours.
• Vaccinations: complete HPV series (ages 9‑45) and Hepatitis B vaccine.
• Screenings: follow guideline‑based cancer screening (e.g., colonoscopy at 45 years, mammography every 2 years starting at 40‑50, low‑dose CT for high‑risk smokers).
• Occupational Safety: use protective equipment when handling carcinogens; test homes for radon.

Complications

If cancer remains untreated or is diagnosed at an advanced stage, several serious complications may occur.

• Metastatic Disease: spread to vital organs (brain, liver, bone) leading to organ failure.
• Obstruction: bowel blockage, urinary retention, or airway compression.
• Bleeding: tumor erosion into blood vessels can cause anemia or life‑threatening hemorrhage.
• Paraneoplastic Syndromes: hormone‑like substances produced by tumors causing neurological, dermatologic, or endocrine disturbances.
• Cachexia: severe muscle wasting, malnutrition, and immunosuppression.
• Infections: immunosuppression from the disease or its treatment (chemotherapy‑induced neutropenia).
• Psychosocial Impact: depression, anxiety, and financial strain may worsen overall health.

When to Seek Emergency Care

Sources: 1. American Cancer Society. “Cancer Facts & Figures 2024.” 2. CDC. “Tobacco‑related cancers.” 3. Temel JS et al. “Early Palliative Care Improves Survival in Metastatic Non‑small‑cell Lung Cancer.” NEJM 2010; 363:733‑742. Additional data from Mayo Clinic, NIH National Cancer Institute, WHO Cancer Fact Sheets, and Cleveland Clinic.