Most of the hidden pain on the right side of the stomach in the 4th month of pregnancy is more likely to be caused by intestinal cramps due to poor diet. You can use a hot water bag or hot towel to apply hot compresses to the stomach to relieve the intestinal cramps. If necessary, improve the ultrasound of the urinary tract or ultrasound of the right lower abdominal appendiceal region to exclude urinary stones and appendicitis. If the ultrasound confirms the presence of urinary stones, conservative treatment is recommended at this time, and if necessary, abortion can be carried out first, followed by extracorporeal lithotripsy or surgery to remove the stones. If the ultrasound confirms that there is appendicitis, you can infuse penicillin anti-inflammatory drugs, if the effect is not good, it is recommended to abort after surgery or upgrade antibiotic treatment, and pay attention to more rest.