Not only chronic colitis, but also all digestive system diseases can cause wasting for the following reasons: 1. Chronic colitis can cause abdominal pain, bloating, and intestinal tinnitus, which can affect the patient’s appetite and lead to reduced appetite, reduced meal intake, and wasting, mainly due to insufficient nutrient intake; 2. Chronic colitis can lead to diarrhea, which can result in a large amount of nutrient loss, water discharge, and electrolyte Patients may experience complications such as chronic fever, hypoproteinemia, electrolyte disorders, acidosis, and loss of nutrients leading to wasting. The patient eats too little and excretes too much, so the wasting is more pronounced.