I have constipation all the time i've had it for a year off and on my diet in bad but at the moment i cant go because it hurts too much more than just unable to go i feel the need as well what is the cause?

Increase water: Treating constipation at home involves increasing per day fluid intake (2.5 liters for female, 3.5 liters for male), increasing fiber content of diet (more fruits and vegetables, apple/prune juice or fiber supplement), and using a stool softener for 1-3 days. Make sure not to strain as this can cause rectal hemorrhoids and bleeding)