Abdominal distension may be caused by various reasons such as excessive gastric acid causing bloating, ovarian cyst, and cells growing outside the uterus. Here are the detailed explanations:

1. Excessive Gastric Acid Causing Bloating

Excessive gastric acid in the stomach can neutralize with pancreatic juice to produce carbon dioxide, resulting in bloating and hiccups. Additionally, tight anus may make it difficult to expel gas, and chronic constipation can gradually lead to abdominal bloating. We can analyze the causes of abdominal bloating by directly analyzing the proportion of gas content in the body. If too much gas is swallowed, the concentration of nitrogen and oxygen in the intestine will be higher. If the bloating is caused by intestinal bacterial fermentation, the concentration of hydrogen and oxygen in the intestine will be higher.

2. Ovarian Cyst

Ovarian cysts can gradually develop over time, leading to pain when you stand up after exercise or sitting. At this point, the condition has become more severe. The fluid accumulation in the cyst can cause the ovary to sag due to gravity, resulting in a feeling of falling pain during exercise. Therefore, women often feel bloated and painful in the lower abdomen.

3. Cells Growing Outside the Uterus

Cells from within the uterus can gradually grow outside the uterus in areas that do not belong to them, such as the fallopian tubes, ovaries, and the outside of the bladder. At the end of menstruation, these cells may also cause a small amount of bleeding, leading to inflammation and damage in the areas where they have spread. Our body automatically produces scar tissue to surround these cells and block their destructive effects. However, the formation of scar tissue can lead to lower abdominal pain and reduce our fertility.

Main Symptoms:

Initially, patients may feel a sense of abdominal fullness that is often present before menstruation. Subsequently, they may experience a bloated and painful feeling in the lower abdomen similar to premenstrual discomfort, but the timing is not necessarily related to menstruation.