2. Frequent fevers or infections

Frequently a sign of leukemia, a cancer of the blood cells that starts in bone marrow. It causes the marrow to produce abnormal white blood cells that hinder your body’s infection-fighting abilities.
3. Difficulty swallowing

Most commonly associated with throat cancer, but could also be a good indicator of lung cancer.
4. Weakness and fatigue

Such a common symptom of cancer that it should be looked at in combination with other symptoms to determine which it is.
5. Feeling full and unable to eat

This is a sign of ovarian cancer. A loss of appetite even when you haven’t eaten for a while is a tip-off.