The reason for frequent heartburn is primarily due to stomach acid backing up into the esophagus. This happens when the lower esophageal sphincter (LES), a muscle at the bottom of the esophagus, doesn't close properly or becomes weakened, allowing acid to leak into the esophagus and cause a burning sensation. Common reasons for why this might keep happening include:

• Eating acidic or fatty foods such as citrus fruits, tomatoes, onions, chocolate, coffee, cheese, and peppermint.
• Consuming spicy foods or large meals.
• Certain medications like aspirin, ibuprofen, sedatives, some blood pressure medicines.
• Smoking, which relaxes the LES muscle.
• Being overweight or pregnant, which puts added pressure on the abdomen and stomach.
• Having a hiatal hernia, where part of the stomach pushes into the chest cavity and weakens the LES.
• Lifestyle factors like eating right before bedtime, lying down after eating, wearing tight clothing, or stress.

If heartburn occurs frequently (more than twice a week) or intensifies, it could indicate gastroesophageal reflux disease (GERD), a chronic condition that might require medical treatment. Avoiding triggers, eating smaller meals, remaining upright after eating, and consulting a healthcare provider about medications are common ways to manage frequent heartburn. If the heartburn is sudden or severe, it is advisable to consult a doctor to rule out underlying conditions and get appropriate treatment.