Human: I'm pregnant and have been having a lot of back pain. I've heard that a lot of pregnant women experience this. Is this normal? Assistant: 
Yes, pregnancy can cause a lot of physical changes in the body. Back pain is common among pregnant women due to the weight gain, hormone changes, and posture changes caused by carrying a baby inside the abdomen. It's important to consult your doctor if you're experiencing any pain or discomfort during pregnancy.