Cancer – Symptoms and causes


cancer refers to any one of a boastfully number of diseases characterized by the development of abnormal cells that separate uncontrollably and have the ability to infiltrate and destroy normal body tissue. Cancer much has the ability to spread throughout your body .
cancer is the second-leading cause of death in the earth. But survival rates are improving for many types of cancer, thanks to improvements in cancer riddle, treatment and prevention.


Signs and symptoms caused by cancer will vary depending on what depart of the body is affected .
Some general signs and symptoms associated with, but not particular to, cancer, include :

  • Fatigue
  • Lump or area of thickening that can be felt under the skin
  • Weight changes, including unintended loss or gain
  • Skin changes, such as yellowing, darkening or redness of the skin, sores that won’t heal, or changes to existing moles
  • Changes in bowel or bladder habits
  • Persistent cough or trouble breathing
  • Difficulty swallowing
  • Hoarseness
  • Persistent indigestion or discomfort after eating
  • Persistent, unexplained muscle or joint pain
  • Persistent, unexplained fevers or night sweats
  • Unexplained bleeding or bruising

When to see a doctor

Make an appointment with your doctor if you have any persistent signs or symptoms that refer you .
If you do n’t have any signs or symptoms, but are concern about your risk of cancer, discuss your concerns with your doctor. Ask about which cancer riddle tests and procedures are appropriate for you .


cancer is caused by changes ( mutations ) to the deoxyribonucleic acid within cells. The DNA inside a cell is packaged into a large numeral of person genes, each of which contains a set of instructions telling the cell what functions to perform, a well as how to grow and divide. Errors in the instructions can cause the cell to stop its normal officiate and may allow a cell to become cancerous .

What do gene mutations do?

A gene mutant can instruct a goodly cell to :

  • Allow rapid growth. A gene mutation can tell a cell to grow and divide more rapidly. This creates many new cells that all have that same mutation.
  • Fail to stop uncontrolled cell growth. Normal cells know when to stop growing so that you have just the right number of each type of cell. Cancer cells lose the controls (tumor suppressor genes) that tell them when to stop growing. A mutation in a tumor suppressor gene allows cancer cells to continue growing and accumulating.
  • Make mistakes when repairing DNA errors. DNA repair genes look for errors in a cell’s DNA and make corrections. A mutation in a DNA repair gene may mean that other errors aren’t corrected, leading cells to become cancerous.

These mutations are the most common ones found in cancer. But many early gene mutations can contribute to causing cancer .

What causes gene mutations?

Gene mutations can occur for several reasons, for case :

  • Gene mutations you’re born with. You may be born with a genetic mutation that you inherited from your parents. This type of mutation accounts for a small percentage of cancers.
  • Gene mutations that occur after birth. Most gene mutations occur after you’re born and aren’t inherited. A number of forces can cause gene mutations, such as smoking, radiation, viruses, cancer-causing chemicals (carcinogens), obesity, hormones, chronic inflammation and a lack of exercise.

Gene mutations occur frequently during normal cell growth. however, cells contain a mechanism that recognizes when a error happen and repairs the mistake. occasionally, a mistake is missed. This could cause a cell to become cancerous.

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How do gene mutations interact with each other?

The gene mutations you ‘re born with and those that you acquire throughout your biography shape together to cause cancer .
For exemplify, if you ‘ve inherited a genetic mutation that predisposes you to cancer, that does n’t mean you ‘re certain to get cancer. alternatively, you may need one or more other gene mutations to cause cancer. Your inherit gene mutation could make you more likely than other people to develop cancer when exposed to a certain cancer-causing substance .
It ‘s not absolved good how many mutations must accumulate for cancer to form. It ‘s likely that this varies among cancer types .

Risk factors

While doctors have an theme of what may increase your risk of cancer, the majority of cancers occur in people who do n’t have any known risk factors. Factors known to increase your gamble of cancer admit :

Your age

cancer can take decades to develop. That ‘s why most people diagnosed with cancer are 65 or older. While it ‘s more coarse in older adults, cancer is n’t entirely an pornographic disease — cancer can be diagnosed at any historic period .

Your habits

Certain life style choices are known to increase your risk of cancer. smoke, drinking more than one drink a day for women and up to two drinks a sidereal day for men, excessive vulnerability to the sun or patronize blister sunburns, being corpulent, and having insecure sex can contribute to cancer .
You can change these habits to lower your risk of cancer — though some habits are easier to change than others .

Your family history

lone a small assign of cancers are due to an inherit condition. If cancer is coarse in your kin, it ‘s possible that mutations are being passed from one genesis to the following. You might be a campaigner for genetic examination to see whether you have inherited mutations that might increase your risk of certain cancers. Keep in judgment that having an familial genetic mutant does n’t necessarily mean you ‘ll get cancer .

Your health conditions

Some chronic health conditions, such as ulcerative colitis, can markedly increase your risk of developing certain cancers. Talk to your doctor of the church about your risk .

Your environment

The environment around you may contain harmful chemicals that can increase your risk of cancer. even if you do n’t smoke, you might inhale secondhand smoke if you go where people are smoking or if you live with person who smokes. Chemicals in your home or workplace, such as asbestos and benzene, besides are associated with an increased risk of cancer .


Cancer and its treatment can cause several complications, including :

  • Pain. Pain can be caused by cancer or by cancer treatment, though not all cancer is painful. Medications and other approaches can effectively treat cancer-related pain.
  • Fatigue. Fatigue in people with cancer has many causes, but it can often be managed. Fatigue associated with chemotherapy or radiation therapy treatments is common, but it’s usually temporary.
  • Difficulty breathing. Cancer or cancer treatment may cause a feeling of being short of breath. Treatments may bring relief.
  • Nausea. Certain cancers and cancer treatments can cause nausea. Your doctor can sometimes predict if your treatment is likely to cause nausea. Medications and other treatments may help you prevent or decrease nausea.
  • Diarrhea or constipation. Cancer and cancer treatment can affect your bowels and cause diarrhea or constipation.
  • Weight loss. Cancer and cancer treatment may cause weight loss. Cancer steals food from normal cells and deprives them of nutrients. This is often not affected by how many calories or what kind of food is eaten; it’s difficult to treat. In most cases, using artificial nutrition through tubes into the stomach or vein does not help change the weight loss.
  • Chemical changes in your body. Cancer can upset the normal chemical balance in your body and increase your risk of serious complications. Signs and symptoms of chemical imbalances might include excessive thirst, frequent urination, constipation and confusion.
  • Brain and nervous system problems. Cancer can press on nearby nerves and cause pain and loss of function of one part of your body. Cancer that involves the brain can cause headaches and stroke-like signs and symptoms, such as weakness on one side of your body.
  • Unusual immune system reactions to cancer. In some cases the body’s immune system may react to the presence of cancer by attacking healthy cells. Called paraneoplastic syndromes, these very rare reactions can lead to a variety of signs and symptoms, such as difficulty walking and seizures.
  • Cancer that spreads. As cancer advances, it may spread (metastasize) to other parts of the body. Where cancer spreads depends on the type of cancer.
  • Cancer that returns. Cancer survivors have a risk of cancer recurrence. Some cancers are more likely to recur than others. Ask your doctor about what you can do to reduce your risk of cancer recurrence. Your doctor may devise a follow-up care plan for you after treatment. This plan may include periodic scans and exams in the months and years after your treatment, to look for cancer recurrence.


Doctors have identified several ways to reduce your risk of cancer, such as :

  • Stop smoking. If you smoke, quit. If you don’t smoke, don’t start. Smoking is linked to several types of cancer — not just lung cancer. Stopping now will reduce your risk of cancer in the future.
  • Avoid excessive sun exposure. Harmful ultraviolet (UV) rays from the sun can increase your risk of skin cancer. Limit your sun exposure by staying in the shade, wearing protective clothing or applying sunscreen.
  • Eat a healthy diet. Choose a diet rich in fruits and vegetables. Select whole grains and lean proteins. Limit your intake of processed meats.
  • Exercise most days of the week. Regular exercise is linked to a lower risk of cancer. Aim for at least 30 minutes of exercise most days of the week. If you haven’t been exercising regularly, start out slowly and work your way up to 30 minutes or longer.
  • Maintain a healthy weight. Being overweight or obese may increase your risk of cancer. Work to achieve and maintain a healthy weight through a combination of a healthy diet and regular exercise.
  • Drink alcohol in moderation, if you choose to drink. If you choose to drink alcohol, do so in moderation. For healthy adults, that means up to one drink a day for women and up to two drinks a day for men.
  • Schedule cancer screening exams. Talk to your doctor about what types of cancer screening exams are best for you based on your risk factors.
  • Ask your doctor about immunizations. Certain viruses increase your risk of cancer. Immunizations may help prevent those viruses, including hepatitis B, which increases the risk of liver cancer, and human papillomavirus (HPV), which increases the risk of cervical cancer and other cancers. Ask your doctor whether immunization against these viruses is appropriate for you.

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