1 - Before you continue reading any further it is important to know that the listed symptoms do not directly mean that you have a cancer. Always seek medical attention if the symptoms are persistent.
2 - Extreme tiredness
The cells of a cancer compete with normal cells and take high amounts of energy, which empties your supplies faster than normal, making you feel extremely tired. Fatigue from a cancer is not similar to normal tiredness solved by more sleep.
cancer.org
3 - Weight Loss
When diagnosed with cancer, around 40 percent of the people reported unexplained weight loss. We have known for decades that some forms of cancer cause alerted cellular metabolism, making you "hypermetabolic".
4 - Constant headaches
A brain tumor perpetuates pressure on the brain and the brain plates which results in permanent or wavelike headaches. It is reported that patients with brain cancer can notice the difference between regular and cancer caused headaches. A brain tumor might also inflict vomiting, seizures and loss of vision depending on where the tumor is located and causing pressure against.
5 - Indigestion or Trouble Eating
Most of us suffer from time to time from indigestion. Heartburn, nausea and flatulence often come with it. But indigestion can also be a sign of a stomach or oesophagus cancer.
Indigestion is most likely caused by something else, but if it won't go away, you should go see a doctor.
6 - Nodes - Knots - Lumps
Many cancers can be felt through the skin. Since tumors are mutating body cells, they might form knots or lumps under the skin. These cancers occur mostly in the breast, testicles and lymph nodes. When you have knots that don't go away by themselves, it should be reported to a doctor. However, not every lump is dangerous. You can find more about different types of lumps from the source.
7 - A cough that won't stop
While most causes for coughing are chronic bronchitis, emphysema or asthma it can also be a sign of lung cancer. Especially when its a lingering cough that won't go away at all, it's time to meet the doctor for a check up.
Its notable that 8 out of 10 diagnosis' are caused by tobacco smoke, so as a smoker you are more endangered than others.
8 - Unusual bleeding
Unusual bleeding can happen in early or advanced cancer. Coughing up blood may be a sign of lung cancer. Blood in the stool (which can look like very dark or black stool) could be a sign of colon or rectal cancer. Cancer of the cervix or the endometrium (lining of the uterus) can cause abnormal vaginal bleeding. Blood in the urine may be a sign of bladder or kidney cancer. A bloody discharge from the nipple may be a sign of breast cancer.
9 - White Patches Inside Your Mouth
Especially smokers and other tobacco users should be aware of this and observe the inside of their mouth regularly. If you have a blister in your mouth that could be a symptom of leukoplakia which is a pre-cancerous area. If not treated right it can evolve to mouth cancer.
10 - Changes in Bladder Function
While the needing to pass urine more or less often than usual might have other reasons its already a serious case when you find blood in your urine or feel pain when urinating. Get a check up at your doctor immediately because these can be symptoms for bladder or prostate cancer.
11 - Changes on your Skin
If you have moles or warts you should observe them regularly. Any change in the size or hairs starting to grow on these could be a sign of melanomas also known as skin cancer. The treatment is easy: the mole or wart will be removed and the success rate is very high when treated early.
12 - Other Symptoms
The signs and symptoms listed on the previous pages are the more common ones seen with cancer, but there are many others that are not listed here. If you notice any major changes in the way your body works or the way you feel let a doctor know. If it has nothing to do with cancer, the doctor can find out more about what’s going on and, if needed, treat it. If it is cancer, you’ll give yourself the chance to have it treated early, when treatment works best.
13 - Changes in Bowel Functions
Blood in the stool (which can look like very dark or black stool) could be a sign of colon or rectal cancer. These are very common types of cancer and happen more often than you might think. Long-term constipation, diarrhea, or a change in the size of the stool may be a sign of colon cancer and should be taken very seriously.
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