Most adults and older children have several respiratory infections each year. Respiratory problems can be as minor as the common cold or as serious as pneumonia. They may affect the upper respiratory system (nose, mouth, sinuses, and throat) or the lower bronchial tubes and lungs. See a picture of the respiratory system.
The upper respiratory system includes the nose, mouth, sinuses, and throat. When you have an upper respiratory infection, you may feel uncomfortable, have a stuffy nose, and sound very congested. Other symptoms of an upper respiratory infection include:
The lower respiratory system includes the bronchial tubes and lungs. Respiratory problems are less common in the lower respiratory system than upper respiratory system.
The symptoms of a lower respiratory (bronchial tubes and lungs) problem usually are more severe than symptoms of an upper respiratory (mouth, nose, sinuses, and throat) problem.
Symptoms of lower respiratory system infections include:
Respiratory problems may have many causes.
Fever is a common symptom of an infection caused by a virus, such as a cold or the flu. Infections caused by bacteria, such as bacterial pneumonia, also can cause a fever.
Temperature varies depending on how you take it. The most common methods to measure it are:
To convert a temperature from one method to another, use the Interactive Tool: How Do Temperatures Compare?
Viral infections are the most common cause of upper respiratory symptoms. Symptoms of a viral illness often come on quickly (over hours to a day or two) without prior illness. Common viral illnesses include colds and influenza (flu).
Antibiotics are not used to treat viral illnesses and do not alter the course of viral infections. Unnecessary use of an antibiotic exposes you to the risks of an allergic reaction and antibiotic side effects, such as nausea, vomiting, diarrhea, rashes, and yeast infections. Antibiotics also may kill beneficial bacteria and encourage the development of dangerous antibiotic-resistant bacteria.
Bacterial infections may develop after a viral illness, such as a cold or influenza, and are less common than viral illnesses. Bacterial infections may affect the upper or lower respiratory system. Symptoms tend to localize to one area. In the upper respiratory system, the most common sites of bacterial infections are the sinuses and throat. In the lower respiratory system, the most common site is the lungs (pneumonia).
Bacterial infections are more common in smokers, people exposed to second-hand smoke, and people with chronic lung disease (such as asthma or chronic obstructive pulmonary disease [COPD]) and other chronic medical problems. Antibiotics can effectively treat most bacterial infections.
Allergies, especially hay fever, are another common respiratory problem. Symptoms include sneezing, clear runny drainage from the nose and eyes, itchy eyes or nose, and stuffy, congested ears and sinuses. The symptoms of allergies often last longer than a typical viral respiratory infection. For more information, see the topic Allergic Rhinitis.
is a chronic disease of the respiratory system. It causes inflammation and narrowing in the tubes that carry air to the lungs (bronchial tubes). The inflammation leads to difficulty breathing, wheezing, tightness in the chest, and cough.
Asthma often begins during childhood and may last throughout a person's life. The cause of asthma is not clearly known. It is more common in people who also have allergies. For more information, see the topic Asthma in Children or Asthma in Teens and Adults.
Check your symptoms to decide if and when you should see a doctor.
Health Tools help you make wise health decisions or take action to improve your health.
Many things can affect how your body responds to a symptom and what kind of care you may need. These include:
You have answered all the questions. Based on your answers, you may be able to take care of this problem at home.
If you're not sure if a fever is high, moderate, or mild, think about these issues:
With a high fever:
With a moderate fever:
With a mild fever:
Certain health conditions and medicines weaken the immune system's ability to fight off infection and illness. Some examples in adults are:
Symptoms of difficulty breathing can range from mild to severe. For example:
Severe trouble breathing means:
Moderate trouble breathing means:
Mild trouble breathing means:
Pain in adults and older children
It is easy for your diabetes to become out of control when you are sick. Because of an illness:
An illness plan for people with diabetes usually covers things like:
The plan is designed to help keep your diabetes in control even though you are sick. When you have diabetes, even a minor illness can cause problems.
Temperature varies a little depending on how you measure it. For adults and children age 12 and older, these are the ranges for high, moderate, and mild, according to how you took the temperature.
Oral (by mouth) temperature
A forehead (temporal) scanner is usually 0.3 C (0.5 F) to 0.6 C (1 F) lower than an oral temperature
Ear or rectal temperature
Armpit (axillary) temperature
Symptoms of a severe allergic reaction (anaphylaxis) may include:
A severe reaction can be life-threatening. If you have had a bad allergic reaction to a substance before and are exposed to it again, treat any symptoms as an emergency. Even if the symptoms are mild at first, they may quickly become very severe.
Symptoms of a heart attack may include:
The more of these symptoms you have, the more likely it is that you're having a heart attack. Chest pain or pressure is the most common symptom, but some people, especially women, may not notice it as much as other symptoms. You may not have chest pain at all but instead have shortness of breath, nausea, or a strange feeling in your chest or other areas.
Symptoms of serious illness may include:
Based on your answers, you may need care soon. The problem probably will not get better without medical care.
Based on your answers, the problem may not improve without medical care.
Based on your answers, you may need care right away. The problem is likely to get worse without medical care.
Based on your answers, you need emergency care.
or other emergency services now.
Based on your answers, you need emergency care.
After you call 911 , the operator may tell you to chew 1 adult-strength (325 mg) or 2 to 4 low-dose (81 mg) aspirin. Wait for an ambulance. Do not try to drive yourself.
Home treatment can help you feel more comfortable when you have mild to moderate respiratory symptoms.
Keep in mind the following guidelines for taking non-prescription medicine for your symptoms:
Call your doctor if any of the following occur during home treatment:
There is no sure way to prevent respiratory illnesses. To help reduce your risk:
To prepare for your appointment, see the topic Making the Most of Your Appointment.
You can help your doctor diagnose and treat your condition by being prepared to answer the following questions:
ByHealthwise StaffPrimary Medical ReviewerWilliam H. Blahd, Jr., MD, FACEP - Emergency MedicineAdam Husney, MD - Family MedicineSpecialist Medical ReviewerDavid Messenger, MD
Current as ofMarch 20, 2017
Current as of: March 20, 2017
William H. Blahd, Jr., MD, FACEP - Emergency Medicine
& Adam Husney, MD - Family Medicine & David Messenger, MD
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