Morning sickness is primarily caused by the hormonal changes and metabolic adjustments that occur during early pregnancy, particularly the increased levels of human chorionic gonadotropin (hCG) and estrogen.

Morning sickness typically begins around the 6th week of pregnancy and subsides by the 12th week for most women. However, some women may experience morning sickness throughout their entire pregnancy.

While morning sickness cannot be completely prevented, there are various strategies and treatments that can help alleviate symptoms. These include dietary modifications, hydration, anti-nausea medications (prescribed by a healthcare professional), and complementary therapies like ginger or acupressure.

You should seek medical attention if you experience severe or persistent nausea and vomiting that prevents you from keeping any food or fluids down, or if you experience signs of dehydration, weight loss, or other concerning symptoms.