Cold and flu are very common nowadays so having good options of decongestants or natural relief medicine has become crucial. Decongestants are a type of medicine that can provide short-term relief for a blocked or stuffy nose (nasal congestion). They can help ease the symptoms of conditions such as colds and flu, hay fever and other allergic reactions, catarrh and sinusitis. Other types of congestion medicine may include essential oils or vitamins that act as preventive medicine to avoid these common issues.