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Nat'l Inst. of Health (16)

Anemia
If you have anemia, your blood does not carry enough oxygen to the rest of your body. The most common cause of anemia is not having enough iron. Your body needs iron to make hemoglobin. Hemoglobin is an iron-rich protein that gives the red color to...

Choking
Food or small objects can cause choking if they get caught in your throat and block your airway. This keeps oxygen from getting to your lungs and brain. If your brain goes without oxygen for more than four minutes, you could have brain damage or die.

Drowning
If you are under water long enough, your lungs fill with water and oxygen cannot get into your blood. A lack of blood oxygen can cause brain damage and death. Water in the lungs, especially contaminated water, can damage the lungs.

Emphysema
Emphysema is a type of chronic obstructive pulmonary disease (COPD) involving damage to the air sacs (alveoli) in the lungs. As a result, your body does not get the oxygen it needs. Emphysema makes it hard to catch your breath. You may also have a...

Jaundice
Jaundice causes your skin and the whites of your eyes to turn yellow. Too much bilirubin causes jaundice. Bilirubin is a yellow chemical in hemoglobin, the substance that carries oxygen in your red blood cells. As red blood cells break down, your...

Lung Diseases
When you breathe, your lungs take in oxygen from the air and deliver it to the bloodstream. The cells in your body need oxygen to work and grow. During a normal day, you breathe nearly 25,000 times. People with lung disease have difficulty...

Porphyria
Porphyrias are a group of genetic disorders caused by problems with how your body makes a substance called heme. Heme is found throughout the body, especially in your blood and bone marrow, where it carries oxygen.

Pulmonary Fibrosis
Pulmonary fibrosis harms the tissues deep in your lungs. The air sacs in your lungs and their supporting structures become inflamed and scarred. If scarring progresses, it makes your lungs thick and stiff. That makes it hard for you to catch your...

Pulmonary Hypertension
Pulmonary hypertension is high blood pressure in the arteries to your lungs. It is a serious condition for which there are treatments but no cure. If you have it, the blood vessels that carry oxygen-poor blood from your heart to your lungs become...

Thalassemia
If you have thalassemia, your body has problems making hemoglobin, the protein in red blood cells that carries oxygen through your body. When your blood does not carry enough oxygen to the rest of your body, you have anemia.