Acidity is caused by excess secretion of acid by the stomach's gastric glands. This excess acid can cause heartburn, inflammation in the throat, and other symptoms like ulcers and dyspepsia. Certain foods, drinks, medications, and lifestyle factors can trigger excess acid production and lead to acidity. Some natural home remedies that can help treat acidity include drinking milk, mint juice, or water with apple cider vinegar and honey, eating bananas or cucumbers, and avoiding irritants like coffee, tea, and spicy foods.