100 reply: abdominal distension, occasional discomfort in descending colon.
Abdominal distension in the upper left, I think the place you are talking about is the spleen area of the colon, which is flatulence, especially for people who are not good at exercise or sedentary. It is caused by poor peristalsis of the colon, and there is generally no organic disease.
After reading what you said, it seems that you still like sports. Frequent strenuous exercise is not good. Excessive fatigue and sleeping too late will affect gastrointestinal function. I suggest you change your lifestyle, pay attention to the combination of work and rest, eat more foods containing more cellulose, and take some gastrointestinal motility drugs when necessary.
I have the same symptoms as you. I also had colonoscopy and B-ultrasound, and nothing happened. I left it alone. I began to adjust my eating habits and defecation habits. It turns out that the stool is also soft, once every 2-3 days. I just took some laxatives and defecated once a day. Eat more vegetables and do more abdominal massage, which will be much better.
I read a book that said it was called "colon-spleen syndrome". I want to do a shellfish enema to see if I can detect the disease and see if the colon in this area is somewhat dilated and peristalsis is not good. Later, I thought it was mydriasis. If it is not serious, there is no special treatment. I didn't do it.
Now I'm much better than before.
I suggest that you also change your lifestyle, try to defecate once a day, go to bed on time, prevent overwork, eat more foods containing vitamins and have a try. FYI