First, read the English article below.

Passing gas up to 20 times per day is not considered unusual. But some symptoms may indicate that there is a more severe problem:  Severe, lasting pain Bloody or black stool Severe diarrhea or constipation Weight loss Chest pain Prolonged nausea Sometimes people assume they just have gas when it is actually a more serious condition such as:  Heart disease Gall stones Appendicitis Irritable bowel syndrome An obstructed bowel He or she will ask you about your eating habits and examine you physically.  The doctor will look to see if your abdomen is distended and may tap to listen to hear if it sound hollow. A hollow sound means that you likely have a lot of gas. Be ready to be honest about your eating habits and medical history. Discuss your medications in case some may be causing you to retain water. 

Now, please write a short abstract for it in Vietnamese. Abstract:
Đến bác sĩ nếu tình trạng đầy hơi là nghiêm trọng và gây cản trở cho sinh hoạt hàng ngày. Đừng bỏ qua những triệu chứng nghiêm trọng. Sẵn sàng để bác sĩ thăm khám.