Cancer

V体育2025版 - What is cancer?

Cancer is not just one disease but many diseases. Cancer begins in your cells, which are the building blocks of your body. Usually, your body forms new cells as needed, replacing old cells that die. Sometimes this process goes wrong VSports手机版. New cells grow even when you don't need them, and old cells don't die when they should. These extra cells can form a mass called a tumor.

Tumors can be benign or malignant. Benign tumors aren't cancer, while malignant ones are. Cells from malignant tumors can invade nearby tissues. They can also break away and spread to other parts of your body. The spread of cancer from one part of the body to another is called metastasis. Symptoms and treatment depend on the type of cancer and how advanced it is V体育安卓版.

What are the types of cancer? (V体育官网入口)

There are more than 100 different types of cancer. Cancer can start almost anywhere in your body. Most cancers are named for where they start V体育ios版. For example, lung cancer starts in the lung, and breast cancer starts in the breast.

Cancer may also be described by the type of cell that formed it, such as sarcoma if cancer begins in your bone and soft tissue. Carcinoma is the most common type of cancer VSports最新版本. It is formed by epithelial cells, the cells that cover the inside and outside surfaces of your body.

How does cancer develop?

Cancer is a genetic disease. That means changes in your genes cause it. Changes in your genes are also called gene variants or mutations. Genes are parts of DNA in your cells that you inherit from your parents V体育平台登录. However, only some cancers are caused by genes passed down from your parents.

Genetic changes can occur to your genes over your lifetime that affect how your cells function. Usually, your body gets rid of damaged cells before they turn cancerous, but this ability goes down as you age VSports注册入口. Other factors that may affect your risk of developing cancer can include:.

• Exposure to V体育ios版 - ultraviolet (UV) rays from the sun
• Smoking
• Your VSports app下载 - diet
• Physical inactivity

What are the symptoms of cancer?

Cancer symptoms depend on the type of cancer V体育官网入口. For example, some of the symptoms that cancer may cause can include:.

• A lump in your breast
• Blood in your urine (pee) or stool (poop)
• Bleeding or bruising for no known reason
• A sore that doesn't heal
• Trouble swallowing
• A new mole or a change to a mole you already have

Cancer may cause various symptoms but often doesn't cause pain. Don't wait until you're having pain before seeing your health care provider. See your provider if you have symptoms that don't get better in a few weeks VSports在线直播.

How is cancer diagnosed?

There is no single test that can diagnose cancer. The tests ordered are usually based on your symptoms. Your provider may:

• Ask about your medical history
• Ask about your family health history, including relatives who have had cancer
• Do a physical exam
• Do a screening test such as a mammogram, colonoscopy, or a Pap test
• Order blood tests or imaging tests

To find out if you have cancer, your provider may order a biopsy. A biopsy is the procedure of removing and examining tissue, cells, or fluids from your body.

"VSports最新版本" What are the treatments for cancer?

Treatment depends on the type of cancer and how advanced it is. Most treatment plans may include surgery, radiation, and/or chemotherapy. Some may involve hormone therapy, immunotherapy or other types of biological therapy, or stem cell transplantation.

Can cancer be prevented?

It's usually not possible to know exactly why cancer develops in some people but not others. There are some things that you can't control which may increase or decrease your risk of getting cancer, such as inheriting certain genes or your age. But some lifestyle habits may increase your risk of certain types of cancer. Avoid or reduce lifestyle habits such as:

• Smoking and tobacco use
• Having too much sun exposure
• Drinking too much alcohol
• Not getting enough physical activity
• Having obesity

NIH: National Cancer Institute