Respiratory tract infections (RTIs) are any infection of the sinuses, throat, airways or lungs.
They're usually caused by viruses, but can be caused by bacteria.
RTIs are thought to be one of the main reasons why people visit their GP or pharmacist. The common cold is the most widespread RTI.
Healthcare professionals generally make a distinction between:
Children tend to get more upper RTIs than adults because they haven't built up immunity (resistance) to the many viruses that can cause these infections.
RTIs can spread in several ways. If you have an infection such as a cold, tiny droplets of fluid containing the cold virus are launched into the air whenever you sneeze or cough. If these are breathed in by someone else, they may also become infected.
Infections can also be spread through indirect contact. For example, if you have a cold and you touch your nose or eyes before touching an object or surface, the virus may be passed to someone else when they touch that object or surface.
The best way to prevent spreading infections is to practise good hygiene, such as regularly washing your hands with soap and warm water.
Read more about preventing germs from spreading.
Common upper respiratory tract infections include:
Common lower RTIs include:
As with upper RTIs, the main symptom of a lower RTI is a cough. However, it's usually more severe and you may bring up phlegm and mucus. Other possible symptoms are a tight feeling in your chest, an increased rate of breathing, breathlessness and wheezing.
Most RTIs pass without the need for treatment and you won't usually need to see your GP. You can treat your symptoms at home by taking over-the-counter painkillers such as paracetamol or ibuprofen, drinking plenty of fluids and resting.
In most cases, antibiotics aren't recommended because they're only effective if the infection is caused by bacteria.
The symptoms of an upper RTI usually pass within one to two weeks.
Visit your GP if:
It's also recommended that you visit your GP if you're over 65 years of age and you have a cough and two or more of the factors listed below, or you're over 80 years of age and have a cough and one of the following factors:
You can also ask your GP about any vaccines you can have to help protect against some RTIs. See the 'Adults' tab on The NHS vaccinations schedule page for more information about these.