If you are fully enlightened, then you will stop suffering...
but to stop suffering before that is not so easy.
Arhats only experience pain but no mental suffering.
http://www.accesstoinsight.org/tipitaka/sn/sn36/sn36.006.nypo.html
"An untaught worldling, O monks, experiences pleasant feelings,
he experiences painful feelings and he experiences neutral
feelings. A well-taught noble disciple likewise experiences
pleasant, painful and neutral feelings. Now what is the
distinction, the diversity, the difference that exists herein
between a well-taught noble disciple and an untaught worldling?
"When an untaught worldling is touched by a painful (bodily)
feeling, he worries and grieves, he laments, beats his breast,
weeps and is distraught. He thus experiences two kinds of feelings,
a bodily and a mental feeling. It is as if a man were pierced by a
dart and, following the first piercing, he is hit by a second dart.
So that person will experience feelings caused by two darts. It is
similar with an untaught worldling: when touched by a painful
(bodily) feeling, he worries and grieves, he laments, beats his
breast, weeps and is distraught. So he experiences two kinds of
feeling: a bodily and a mental feeling.
"Having been touched by that painful feeling, he resists (and
resents) it. Then in him who so resists (and resents) that painful
feeling, an underlying tendency of resistance against that painful
feeling comes to underlie (his mind). Under the impact of that
painful feeling he then proceeds to enjoy sensual happiness. And
why does he do so? An untaught worldling, O monks, does not know of
any other escape from painful feelings except the enjoyment of
sensual happiness. Then in him who enjoys sensual happiness, an
underlying tendency to lust for pleasant feelings comes to underlie
(his mind). He does not know, according to facts, the arising and
ending of these feelings, nor the gratification, the danger and the
escape, connected with these feelings. In him who lacks that
knowledge, an underlying tendency to ignorance as to neutral
feelings comes to underlie (his mind). When he experiences a
pleasant feeling, a painful feeling or a neutral feeling, he feels
it as one fettered by it. Such a one, O monks, is called an
untaught worldling who is fettered by birth, by old age, by death,
by sorrow, lamentation, pain, grief and despair. He is fettered by
suffering, this I declare.
"But in the case of a well-taught noble disciple, O monks, when
he is touched by a painful feeling, he will not worry nor grieve
and lament, he will not beat his breast and weep, nor will he be
distraught. It is one kind of feeling he experiences, a
bodily one, but not a mental feeling. It is as if a man were
pierced by a dart, but was not hit by a second dart following the
first one. So this person experiences feelings caused by a single
dart only. It is similar with a well-taught noble disciple: when
touched by a painful feeling, he will no worry nor grieve and
lament, he will not beat his breast and weep, nor will he be
distraught. He experiences one single feeling, a bodily one.
"Having been touched by that painful feeling, he does not resist
(and resent) it. Hence, in him no underlying tendency of resistance
against that painful feeling comes to underlie (his mind). Under
the impact of that painful feeling he does not proceed to enjoy
sensual happiness. And why not? As a well-taught noble disciple he
knows of an escape from painful feelings other than by enjoying
sensual happiness. Then in him who does not proceed to enjoy
sensual happiness, no underlying tendency to lust for pleasant
feelings comes to underlie (his mind). He knows, according to
facts, the arising and ending of those feelings, and the
gratification, the danger and the escape connected with these
feelings. In him who knows thus, no underlying tendency to
ignorance as to neutral feelings comes to underlie (his mind). When
he experiences a pleasant feeling, a painful feeling or a neutral
feeling, he feels it as one who is not fettered by it. Such a one,
O monks, is called a well-taught noble disciple who is not fettered
by birth, by old age, by death, by sorrow, lamentation, pain, grief
and despair. He is not fettered to suffering, this I declare.
"This, O monks, is the distinction, the diversity, the
difference that exists between a well-taught noble disciple and an
untaught worldling."
So it's all about becoming more and more dispassionate and a
step in the right direction is better than none at all ?