Feeling as if food remains in the stomach for many hours after eating can happen due to indigestion, overeating, acidity, gastritis, constipation, stress, irregular meal timings, low physical activity, or sometimes slower stomach movement. Heavy, oily, spicy, or late-night meals can also make digestion feel sluggish. Instead of starting random digestive tonics on your own, it is better to first improve eating habits and identify the possible cause. Eat smaller meals at regular times, chew food properly, and avoid lying down immediately after eating. Drinking enough water, walking for 15-20 minutes after meals, and including fibre-rich foods such as fruits, vegetables, curd, and whole grains may help improve digestion naturally. Avoid excess tea, coffee, alcohol, smoking, junk food, and carbonated drinks, as these can worsen bloating and heaviness. Some people may benefit from probiotics or digestive medicines prescribed by a doctor, especially if acidity, gas, or constipation is present. However, persistent symptoms should not be ignored because conditions such as gastritis, acid reflux, ulcers, gallbladder problems, thyroid disorders, diabetes-related slow digestion, or stomach infection can also cause delayed digestion and fullness. You should consult a doctor if the problem continues for more than a few days or if you develop vomiting, severe pain, weight loss, difficulty swallowing, black stools, or persistent bloating. Proper evaluation and treatment of the underlying cause usually help improve digestion effectively.