<s>[INST] i get pain on right side .i am 21 weeks pregnant .it is a dull pain ,i get it when i breathe or when i change from this side to that while sleeping or when i press while standing. why is that like that [/INST] Welcome to Chat Doctor If the pain is in the side of the lower chest, you could be having a muscular pain due to bad posture during sleep or work. Nothing to worry. You can apply pain killing balm or gel on that area to relieve the pain. Adopt proper posture, no sideways turning of head and upper body during sleep. Get a urine test if kidney stone is suspected. If you develop fever, back pain and burning sensation on passing urine you would need medical help to take care of a possible urinary infection which should not be neglected.  Chat Doctor.  Eat plenty of fresh fruits and vegetables to prevent constipation as well. </s>