Hello doctors ,my age is 25. Height 5 ft 11 inch. Weight 80 kg. From 8 months I was having black stool so I did endoscopy twice it showed fungal and antral gastritis and chronic superficial gastritis buta s my abdomen and intestinal pain was increasing and bleeding contisinue so 3 dyas ago I have my ct scan with contrast .it shows partial occluding thrombus seen 2 cm from origin in SMA and congestion in pararectal and pericolonic region. So doctor scheduled my colonoscopy. My question is that does colonoscopy is painful or not. Please guide?