15. Fatigue
It may seem strange, but fatigue can also be a warning sign of cancer because it is the natural action of the immune system. Some cancers can also trigger blood loss, which also triggers fatigue. See your doctor if you feel tired.
Note: Despite these signs mentioned above, make sure to consult your healthcare professional. Reacting in time is of extreme importance as it increases the chances of striking the cancer before it infects other parts of the body.
