There are many causes of cancer that have been identified by researchers over time. There are more than 200 different cancer types already known to experts. It can develop in any part of the body affecting any type of tissue.

2. There are many causes of cancer that have
been identified by researchers over time.
There are more than 200 different cancer types
already known to experts.
It can develop in any part of the body affecting
any type of tissue. Clearly, the sun will not
give you lung cancer and smoking will not
cause melanoma.

3. Other than some of the
infectious diseases, most of
the common illnesses, which
include cancer, are all
multifactorial.
This clearly shows that there
are several factors involved
in causing cancer. To be
precise, cancer doesn’t have
a single cause but there
could be many causes.

4. Carcinogens are
something that helps to
form cancer. One
example is tobacco
smoke – a potent
carcinogen.
However, not everyone
develops lung cancer by
smoking. So, there
ought to be some other
factors too.

5. Cancers are very common
in older people. In fact,
there are some types of
cancer that become more
common with age.
This is mainly because of
the bodily changes taking
place to make a cell
cancerous at the first
instance.

6. There are usually a number of
changes affecting the genes
inside a cell before it develops
cancer. These changes
normally happen as a result of
accident when healthy cells
divide.
They may also happen due
carcinogenic damage, and
damage that is passed on to
the other cells during division.

7. There should be several
genetic mutations within
a particular cell before it
develops cancer.
There are times when
people are born with one
such mutation. This,
however, does not mean
that they will get cancer.

8. But when one mutation is already present from
the beginning, it is likely statistically that the
person will get cancer during his/her lifetime.
Such cases are called predisposition.
For instance, the breast cancer genes – BRCA1 and
BRCA2 are genetic predisposition. Women
carrying either of these defective genes have
higher risk of getting breast cancer than others.

9. People having problems with
the immune system are likely
to develop some kinds of
cancer. There are certain
groups of people to be noted –
people who have undergone
an organ transplant or taking
drugs for suppressing the
immune system to cease organ
rejection; people with AIDS or
HIV; people born with some
rare medical syndrome
affecting the immunity system.

10. There are cancers caused by
certain viruses, lie cervical
cancer and several other
cancers affecting the anal or
genital area liver cancer
stomach cancer and some
lymphomas.
Transplanted organs or
chronic infections can
consistently stimulate cell
division.

11. This will lead to genetic
faults and may develop
into cancers or
lymphomas.
Other factors that can
cause cancer are
smoking, lack of physical
activity, diet, overexposur
e to sunlight, viruses and
other environmental
factors.