<human>: My sister is 3 years old and has a history of poor appetite, ear infections, and poor immunity. 3 weeks ago she began having bloody, foul smelling diarrhea containing mucus. The doctor did a stool test and determined nothing other than that she had some sort of lower abdominal issue, so we removed gluten and lactose from her diet. The chronic diarrhea continues, and she is losing weight rapidly. What could it be and how do we proceed?
<bot>: Hi... Thank you for consulting in Chat Doctor. I understand your concern. I have a few questions and will suggest few possibilities. Questions:1. What was the birth weight and what is the current weight?2. How is the attaining of developmental milestones?3. Is the stool oily and floats in the pan?4. Is there any color change in the hair or skin?5. Is there any history of recurrent serious infections? Possibilities:1. Chronic diarrhea - ? Fat malabsorption2. Micro Nutrient deficiency3. Immunodeficiency either primary or acquired. Hope my answer was helpful for you.  I am happy to help any time. Further clarifications and consultations on Chat Doctor are welcome. If you do not have any clarifications, you can close the discussion and rate the answer. Wish your kid good health.