4) Abdominal distension
Abdominal distension is a visible sign that can be verified by looking at and touching the abdomen. This usually happens when your gastrointestinal tract is filled with air or gas. An individual can recognize this symptom by experiencing the sensation of uncomfortable sense of satiation or fullness with pressure in the abdominal area and often accompanied by belching. At some point, the sensation can go from uncomfortable to painful. Depending on your natural complexion, your belly may look larger, and even your clothes might look tighter.
Burping might also be accompanied by abdominal noises or gurgling. This is because the lack of lactase does not allow the monosaccharide to be “split,” and it remains in the intestinal lumen untouched and impossible to be absorbed. Thus, your intestinal bacteria take over and ferments these carbohydrates to obtain energy, filling the abdomen with gas. However, this symptom can get progressively worse by swallowing air (such as when someone chews gum), smoking, or eating too fast.