Anemia (uh-NEE-me-uh) is a condition in which your blood has a lower than normal number of red blood cells. Anemia also can occur if your red blood cells don't contain enough hemoglobin (HEE-muh-glow-bin). Hemoglobin is an iron-rich protein that gives blood its red color. This protein helps red blood cells carry oxygen from the lungs to the rest of the body. If you have anemia, your body doesn't get enough oxygen-rich blood. As a result, you may feel tired or weak.
Signs and symptoms of a drug allergy often occur within an hour after taking a drug. Less commonly, reactions can occur hours, days or weeks later. Drug allergy symptoms may include: 1  Skin rash. 2  Hives. 3  Itching. 4  Fever. 5  Swelling. 6  Shortness of breath. 7  Wheezing. 8  Runny nose.
Symptoms of a food allergy. The symptoms of a food allergy almost always develop a few seconds or minutes after eating the food. Some people may develop a severe allergic reaction (anaphylaxis), which can be life threatening. The most common type of allergic reaction to food is known as an IgE-mediated food allergy. Symptoms include: 1  tingling or itching in the mouth.  a raised, itchy red rash (urticarial) â in some cases, the skin can turn red and itchy, but without a raised rash.