Hello Danish! i understand your concern. Nicotine gums works by releasing nicotine which is absorbed into the body and binds to nicotine receptors, reducing nicotine craving and withdrawal symptoms associated with smoking cessation. Common side effects are increase heart rate,increased blood pressure,oral irritation,dental pain,hiccups,heartburn,nausea, and indigestion. People with history of heartburn are likely to experience flare up on using nicotine gum, and hence it is in their best interest to avoid it. You can consult your doctor to take separate medication for heartburn and gastrointestinal upset. Take Care!