Apple and onion water does not cure cough. Apples and onions are rich in nutrients, apples are rich in vitamin C, vitamin E, niacin, protein, and sodium, magnesium, potassium and other trace elements; onions are rich in vitamin C, vitamin B2, and phosphorus, potassium, calcium and other trace elements, which can replenish the nutrients needed by the body, and is beneficial to the health of the body. But apples and onions do not have the role of treating cough, and can not replace the medicine to treat the disease. Cough can be due to acute and chronic bronchitis, pharyngitis, tonsillitis, pneumonia, allergies and many other reasons, and need to be targeted treatment to really improve the symptoms. It is recommended that cough sufferers seek medical attention from a medical professional in a timely manner.