Another feature of the hormone progesterone is that it can have a slight constipating effect on the body. As it builds up in your body, it can slow down your digestive system. This is why you may experience some constipation in the few days before your period – your stomach might ache, and your poops might be infrequent, and look like small lumps, or a lumpy sausage. If you eat foods that are fatty and less fibrous thanks to your PMS food cravings, then this can also have an effect.
Certain health conditions such as Irritable Bowel Syndrome (IBS), endometriosis or even just having typically painful periods can make you more likely to be constipated, especially in the first few days of your period. As well as dealing with period constipation, it’s also normal to experience bloating and weight gain during your menstrual cycle.