what are the common cause on having constipation?

From my experience, i constipate when i wasn't able to drink at least 8 glasses of water, haven't eaten at least a cup of veggies the whole day and has not eaten a fruit. Since i am always sitting doing some works at the computer, i see to it that i get to move or stand and walk every now and then, because if i don't , i am sure i will constipate.

A diet poor in fiber makes you constipate. Diversify what you eat and drink 8 glasses of water a day or more if you are sweating a lot. Certain diseases of the colon/intestines cause constipation also.