When does morning sickness usually start during pregnancy?

Morning sickness generally begins around the 6th week of pregnancy, approximately 42 days after conception, although the exact timing may vary from person to person. Morning sickness is primarily caused by increased levels of human chorionic gonadotropin (hCG) in the body, along with reduced gastric acid secretion and prolonged gastric emptying time. Most pregnant women experience morning sickness and other early pregnancy symptoms around the 6th week of pregnancy, but some may experience symptoms earlier or later, and some may not experience morning sickness at all throughout their entire pregnancy. Morning sickness usually gradually diminishes or disappears around the 12th week of pregnancy, although in some cases it may persist for a longer duration. If you have concerns or experience severe morning sickness, it is advisable to seek timely medical consultation with a healthcare professional.