The urge of getting quick success in life often makes one selfish...

May be the thought of losing something and not getting it back makes one selfish

Selfishness is natural. Every animal on Earth including humans are selfish by nature. This is nature's shield to animal world against perils. It is instinct of self protection and advancement that gives protection and helps advancement in all fields. All that we need to ensure is not to play foul and act according to law.

Selfishness is essentially attachment to 'self'. This cannot be removed. This can only be widened. The concept 'self' consists of identifying what is my, mine. Narrowest concept is purely indvidualistic. This may be widened to 'my family', 'my city','my province' 'my nation', 'my Earth'. These concepts give rise to feelings of individualism, family politics, provincialism, nationalism and patriotism. If we appreciate this concept, we shall find that even the great martyrs were selfish. They fought for 'my country'. There is hardly any revolutionary who would die for some other country.

Let us widen the scope of self and work for 'my country' and not only for 'myself', 'my family' or 'my province'.

The unnecessary urge to become number one by anyway makes one selfish

Every one become selfish in life because of ego and other factors affecting that person at that time

necessity of completeness of one's wishes makes the person selfish.

Excessive love of oneself what is known as 'narcissism' could be the possible reason!

Lack of sharing habit, thinking always about one's benefit are a few things that aids in the growth of selfish habit and makes one selfish to the extent of beyond repairable or recoverable...

We are all selfish to a certain extent….I think the person loose love and care since childhood, So they grew up with all selfish matters.

According to me,the fear of losing something makes one selfish.