What is cancer What are the three main types of cancer Class 12?

What is cancer What are the three main types of cancer?

The major types of cancer are carcinoma, sarcoma, melanoma, lymphoma, and leukemia. Carcinomas — the most commonly diagnosed cancers — originate in the skin, lungs, breasts, pancreas, and other organs and glands. Lymphomas are cancers of lymphocytes.

What is cancer exactly?

Cancer refers to any one of a large number of diseases characterized by the development of abnormal cells that divide uncontrollably and have the ability to infiltrate and destroy normal body tissue. Cancer often has the ability to spread throughout your body. Cancer is the second-leading cause of death in the world.

What is cancer Ncert?

Causes of cancer : Transformation of normal cells into cancerous neoplastic cells may be induced by physical, chemical or biological agents. These agents are called carcinogens. Ionising radiations like X-rays and gamma rays and non-ionizing radiations like UV cause DNA damage leading to neoplastic transformation.

What is major cancer?

Major Cancer

A malignant tumour positively diagnosed with histological confirmation and characterized by the uncontrolled growth of malignant cells with invasion and destruction of normal tissue. The term Major Cancer includes, but is not limited to, leukemia, lymphoma and sarcoma.

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Which type of cancer is most common?

The most common type of cancer on the list is breast cancer, with 284,200 new cases expected in the United States in 2021. The next most common cancers are prostate cancer and lung cancer.

What foods destroy cancer cells?

Top Cancer-Fighting Foods

  • Folate-Rich Foods.
  • Vitamin D.
  • Tea.
  • Cruciferous Vegetables.
  • Curcumin.
  • Ginger.

Which foods cause cancer?

Cancer causing foods

  • Processed meat. According to the World Health Organization (WHO), there is “convincing evidence” that processed meat causes cancer. …
  • Red meat. …
  • Alcohol. …
  • Salted fish (Chinese style) …
  • Sugary drinks or non-diet soda. …
  • Fast food or processed foods. …
  • Fruit and vegetables. …
  • Tomatoes.

What are 7 warning signs of cancer?

These are potential cancer symptoms:

  • Change in bowel or bladder habits.
  • A sore that does not heal.
  • Unusual bleeding or discharge.
  • Thickening or lump in the breast or elsewhere.
  • Indigestion or difficulty in swallowing.
  • Obvious change in a wart or mole.
  • Nagging cough or hoarseness.

What are the symptoms cancer?

Common Signs and Symptoms of Cancer

  • Pain. Bone cancer often hurts from the beginning. …
  • Weight loss without trying. Almost half of people who have cancer lose weight. …
  • Fatigue. …
  • Fever. …
  • Changes in your skin. …
  • Sores that don’t heal. …
  • Cough or hoarseness that doesn’t go away. …
  • Unusual bleeding.

What causes cancer Class 9?

Carcinogens like chemical, tobacco, alcohol, radiations such as ultraviolet coming from the sun are considered the lead causes of cancer.

How can you prevent cancer cells from developing?

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  1. Don’t use tobacco. Using any type of tobacco puts you on a collision course with cancer. …
  2. Eat a healthy diet. …
  3. Maintain a healthy weight and be physically active. …
  4. Protect yourself from the sun. …
  5. Get vaccinated. …
  6. Avoid risky behaviors. …
  7. Get regular medical care.
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