pain

have a pain in your stomach/leg/side etc be in pain chest pain/back pain/neck pain etc severe/terrible/chronic pain sharp pain =a short but severe pain 

excruciating pain =very severe pain 

dull pain =one that is not severe but continues for a long time 

nagging pain =one that continues for a long time and keeps bothering you  

shooting pain (=a severe pain that starts in one place then quickly moves to another)  

ease/relieve/kill pain pain relief/control inflict pain (on somebody)  

labour pains (=pain felt by a woman who is starting to have a baby)  

aches and pains (=slight feelings of pain that are not very serious)