Hi I Am Concerned About My Brother , 70lb Weight

Hi I am concerned about my brother , 70lb weight loss in 8 months , severe right lower quadrant abdominal pain withdiaphoresis , which can come on after walking and sometimes after eating.he has had negative colonoscopy for malignancy , had 5 polyps removed and has divertic disease that was benign at time of colonoscopy. He has history of myasthenia graves since 2008 and had been on steroids for 2 years and remains on mestninon

I am an icu run