causes of high cough: postnasal drip. asthma, especially cough-variant asthma, which causes a cough as the main symptom. acid reflux or gastroesophageal reflux disease (GERD) chronic bronchitis or other forms of chronic obstructive pulmonary disease (COPD) natural remedies for cough as some may interact with medications you take. Stay hydrated. Fluids can help thin secretions. Gargle with warm saltwater to help cleanse the throat and rid it of mucus. Elevate your head with extra pillows at night to ease a chronic dry cough. Inhale steam in a shower, or use a cool-mist humidifier to relieve dry cough. Cough drops may soothe an irritated throat. Do not smoke or use tobacco products. Avoid inhaled irritants such as smoke, dust, or other pollutants. Honey often can be an effective treatment for a persistent cough. Add honey to hot tea, or even grape juice. Ginger, prepared as a tea, is often used to help reduce symptoms of chronic cough and clear the nasal passages. Other herbs such as eucalyptus or mint are often used to relieve cough symptoms.