Definition
Cancers are a large family of diseases that involve abnormal cell growth with the potential to invade or spread to other parts of the body.

Signs and symptoms of cancer

1. Unexplained weight loss

Most people with cancer will lose weight at some point. When you lose weight for no known reason, it’s called an unexplained weight loss. An unexplained weight loss of 10 pounds or more may be the first sign of cancer. This happens most often with cancers of the pancreas, stomach, esophagus (swallowing tube), or lung.

2. Fever

Fever is very common with cancer, but it more often happens after cancer has spread from where it started. Almost all people with cancer will have fever at some time, especially if the cancer or its treatment affects the immune system. (This can make it harder for the body to fight infection.) Less often, fever may be an early sign of cancer, such as blood cancers like leukemia or lymphoma.
3. Fatigue
Fatigue is extreme tiredness that doesn’t get better with rest. It may be an important symptom as cancer grows. But it may happen early in some cancers, like leukemia. Some colon or stomach cancers can cause blood loss that’s not obvious. This is another way cancer can cause fatigue.
4. Pain
Pain may be an early symptom with some cancers like bone cancers or testicular cancer. A headache that does not go away or get better with treatment may be a symptom of a brain tumor. Back pain can be a symptom of cancer of the colon, rectum, or ovary. Most often, pain due to cancer means it has already spread (metastasized) from where it started.
5. Skin changes
Along with skin cancers, some other cancers can cause skin changes that can be seen. These signs and symptoms include:

Darker looking skin (hyper-pigmentation)
Yellowish skin and eyes (jaundice)
Reddened skin (erythema)
Itching (pruritis)
Excessive hair growth [url]

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