A common and usually harmless upper respiratory infection, colds are characterized by a runny nose, sore throat and cough. If you are suffering from a cough or cold, taking over-the-counter nasal decongestants and expectorants will help relieve symptoms and speed recovery. However, if you have a persistent cough that will not go away, it may signal an underlying health problem. In this case, seek medical attention. Some herbs may help alleviate cold symptoms and soothe a cough, but scientific evidence showing they work is limited.
Licorice
Licorice is traditionally used to treat a sore throat, cough and bacterial or viral infections, notes MedlinePlus, an online resource of the National Institutes of Health. However, scientific evidence to prove it works is lacking. A common food flavoring, licorice is likely safe, but taking high doses or using it for longer than four weeks can cause serious effects, including high blood pressure, weakness and even paralysis. Do not use this herb if you are pregnant as it may cause a miscarriage. Licorice is contraindicated in several conditions, including kidney and heart disease. It may also interact with a number of drugs, including warfarin and digoxin. Talk to your doctor before using it.
Eucalyptus
Eucalyptus is a common ingredient in remedies for the common cold and, according to the University of Maryland Medical Center, is an effective treatment for coughs. It may also help break up phlegm and relieve congestion. It is commonly supplied as a diluted oil that you can rub on the chest or inhale the vapors. Do not take eucalyptus oil orally. It is unsafe and may cause stomach, muscle weakness and feelings of suffocation, RxList warns. Do not use eucalyptus oil to treat a child suffering from a cough or cold.
Slippery Elm
Slippery elm may help ease a sore throat and cough, although there is no scientific evidence to show that it is effective, according to the University of Maryland Medical Center. The bark of the slippery elm tree is used to make herbal preparations and is likely safe for most people. However, it may cause an allergic reaction in some people. Do not use this herb if you are pregnant or breast-feeding. RxList notes that slippery elm contains fibers that may affect how much medicine your body can absorb. Taking this herb one hour after your other medicines may lessen this effect, notes RxList, but check with your doctor before taking slippery elm if you are on any oral medication.
