He has a bloated, uncomfortable feeling after meal.
(他饭后肚子觉得胀胀的，很不舒服。) 或 He feels bloated after eating.

He has bouts of abdominal pain.
(他有一阵阵的肚痛。)

He feels bloated in his abdominal area.
(他感到肚子胀胀的。)

The pain is mainly in the lower (upper) right part of the abdomen.
(痛是在肚子下半部。)

He has nausea and vomiting.
(他有恶心和呕吐。)

It is difficult or painful for him to swallow.
(他吞下食物时会痛。)

He has passed more gas than usual.
(他放…比平常多。)

He has been constipated for a few days.
(他便秘了好几天。)

He suffers pains when he moves his bowels.
(他大便时很痛。)

He has some bleeding from his rectum.
(他的肛门出血。)

He has noticed some blood in his bowel movements.
(他发觉大便时有些血。)

His bowel movements are pale, greasy and foul smelling. ／His bowel movements are grey (or black) in color.
(他的大便呈灰白色。)

He has trouble with diarrhea.
(他拉肚子。)