Cancer is a group of diseases that

Cancer is a group of diseases that can cause almost any signs or symptoms.The signs and symptoms will depend on where the cancer is how big it is and how much it affects the organs or tissues.If a cancer spread (metastasized) signs or symptomsmay appear in different parts of the body.
As a cancer grows, it can begin to push on nearby organs, blood vesselsand nerves.This pressure cause some of the sign ans simptom of cancer. If the cancer is in a critical area. Such as certain parts of the brain, event start in places where it will not cause any signs or symptoms until it has grown quite large. Cancer of the pancreas, for example usually don't cause symptoms until they grow large enough to press no nearby nerves ororgans (this causes back or belly pain).Others may grow large around the bile duct and black the flow of bile.This cause the eyes and skin to look yellow (jaundice).By the time a pancreactic cancer causes signs or symptoms like these,it is usually in an advanced stage. This means it has grown and spread beyondthe lace it started the pancreas.
A cancer may also cause sympyomslike fever, extreme tiredness 9fatigue) or weight loss. This may be because cancer cells use up much of the ody's energy supply or the may release substances that change the way the body makes energy from food. Or the cancer may cause the imune system to ract in ways that produse these signs and symptoms.Someimes caner cells release substance into the bloodstream that cause symptoms which are not usually linked to cancer.For example, some cancer of the pancreas can release substance that raise blood clots in veins of the legs.Some lung cancers make hormonc-like substances taht raise blood calcium levels.This effeects nerves and mucsles,making the person deel weak and dizzy.
Treatment works best when cancer is found early while it is still small and is less likely to have spread to other parts of the body.This often means a better chance for a ure.Especially if the cancer an be removed with surgery.