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What causes fatigue, headache and shortness of breath? 24 possible conditions

See a list of possible causes in order from the most common to the least.


Cold and Flu Overview

Common colds and influenza are contagious infections that affect the respiratory system. Both are airborne illnesses, spread through coughing and sneezing. Shared symptoms include headache, cough, sore throat, and more.

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What is anxiety? Anxiety often manifests itself as an apprehension about daily life. Learn the basics with this overview of the types of anxiety disorders.

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Pneumonia is an infection of the lungs. General symptoms include chest pain, fever, cough, nausea, and difficulty breathing. Blue skin, high fever, and bloody mucus are serious signs.

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Generalized Anxiety Disorder

People who suffer from generalized anxiety disorder, or GAD, worry uncontrollably about common occurrences and situations. The condition may also be called chronic anxiety neurosis.GAD is different than normal feeling...

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High Blood Pressure Overview

High blood pressure (hypertension) increases your risk for heart attack, stroke, coronary heart disease, and other serious health problems. Left untreated, high blood pressure can damage blood vessels and vital organs.

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Infectious Mononucleosis

Infectious mononucleosis, or "mono," is a group of symptoms caused by the Epstein-Barr virus. One potential symptom is a pink rash that looks like the measles.

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Iron Deficiency Anemia

Iron-deficiency anemia is the most common type of anemia, which occurs when the body does not have enough of the mineral iron. The body needs iron to produce hemoglobin, which carries oxygen to the body's tissues...

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Chronic Bronchitis

People often develop acute bronchitis after a viral chest infection. Blue-colored lips ankle or foot swelling can result.

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Tuberculosis (TB) is a highly infectious disease that primarily affects the lungs. A severe and long-lasting cough, fever, and night sweats could indicate an active TB infection.

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Diabetic Ketoacidosis

This condition is considered a medical emergency. Urgent care may be required.

Diabetic ketoacidosis (DKA) is a serious complication that stems from diabetes. If you don't have enough insulin to help your body process sugars (glucose), your body will start burning fat to fuel itself. As a result...

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Chemical Burns

This condition is considered a medical emergency. Urgent care may be required.

Chemical burns occur when the skin or eyes come into contact with irritants, such as acids or bases. Symptoms vary, but skin reactions, pain or numbness are common.

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What You Need to Know About Paroxysmal Nocturnal Hemoglobinuria

Paroxysmal nocturnal hemoglobinuria is a rare disorder that causes red blood cells to break down sooner than normal. This can lead to symptoms that range from minimal (urine discoloration) to severe (stroke).

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Sarcoidosis is an inflammatory disease that causes granulomas, which are clumps of immune cells, to form in different organs. A skin rash is one symptom of sarcoidosis of the skin.

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Hypovolemic Shock

This condition is considered a medical emergency. Urgent care may be required.

Hypovolemic shock (hemorrhagic shock) is a life-threatening condition that results when you lose more than 20 percent of your body's blood or fluid supply, preventing the heart from pumping sufficient blood to your body.

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Parrot Fever (Psittacosis)

Parrot fever is an infection caused by a specific type of bacteria called Chlamydia psittaci. In most cases, humans catch parrot fever from birds, including parrots, chickens, turkeys, pigeons, cockatiels, parakeets...

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Acute Mountain Sickness

Acute mountain sickness (altitude sickness or high altitude pulmonary edema) occurs in high altitudes, especially when exercising. A lack of oxygen can give the skin and lips a blue tinge.

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Absence of Gamma Globulin in Blood

Agammaglobulinemia (AGMX) is an inherited immune system disorder. Passed from parent to child, it is also known as Bruton’s agammaglobulinemia, congenital agammaglobulinemia, and X-linked agammaglobulinemia. AGM...

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Malignant Hypertension (Arteriolar Nephrosclerosis)

This form of high blood pressure comes on very quickly and requires immediate medical help. You're especially at risk if you already have hypertension or smoke.

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Polycythemia Vera

Polycythemia vera is a disorder in which the body produces an excessive amount of red blood cells. This can lead to clots, which block blood from reaching the heart or brain, causing serious damage.

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Legionnaires' Disease

Legionnaires' disease is a serious type of lung infection, or pneumonia, caused by bacteria. Fever, chills, cough, and head and muscle aches are common symptoms.

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This feature is for informational purposes only and should not be used to diagnose.
Please consult a healthcare professional if you have health concerns.