Stomach pain after eating maida (refined flour) parathas could be caused by several factors:

1. Indigestion: Maida is processed and can be harder to digest compared to whole wheat flour. If your digestive system is sensitive, it might cause bloating, gas, or stomach pain.
2. Acidity: Maida-based foods can sometimes cause acid reflux or heartburn, leading to stomach discomfort.
3. Food Sensitivity: Some people may have a sensitivity to maida or gluten, which can cause digestive issues, including stomach cramps and discomfort.
4. Heavy Meal: If the parathas were fried or consumed in large quantities, they could be heavy on the stomach, leading to indigestion or discomfort.

To help ease the pain, try drinking warm water, ginger tea, or a light antacid if you suspect acidity. If the pain persists or worsens, consider consulting a doctor.