What is the difference between IBS-C and IBS-D?

IBS-C, otherwise known as IBS with constipation, is characterized by the following stool characteristics: Hard stools more than 25% of the time and loose stools less than 25% of the time. Approximately 25% of people with IBS-C reported abdominal pain, straining, infrequent stools, bloating and/or gas as their most bothersome symptoms. Gas, bloating, and abdominal pain were reported by constipation sufferers as occurring on average of over 200 times a year. IBS-D, otherwise known as IBS with diarrhea, is characterized by the following stool characteristics: Loose stools more than 25% of the time and hard stools less than 25% of the time. The most bothersome IBS symptom reported by 43% of IBS-D sufferers were abdominal pain or discomfort, while 37% reported sudden urges to have bowel movements. People with IBS-D experience symptoms of gas and frequent stools over 200 times a year.

IBS-C is characterized by more episodes of constipation (hard, lumpy stools) while IBS-D is characterized by more episodes of diarrhea (loose, watery stools). It's actually quite common to have IBS with a mix of both constipation or diarhhea, which is called IBS-mixed. I thought this article may be of interest: https://irritablebowelsyndrome.net/what-is-ibs/types-of-ibs/.