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.
Different people react differently to the same allergens. Some people may just have an uncomfortable rash, while others may go into anaphylactic shock. In any case, signs and symptoms of a food allergy usually develop within a few minutes to an hour after having ingested the food. The most common signs and symptoms of a true food allergy include: 1  tingling in the mouth; 2  itching or eczema; 3  swelling, especially on the lips, face, throat, and neck; 4  wheezing, nasal congestion, and a general difficulty in breathing; 5  abdominal pain, nausea, and vomiting. 6  dizziness, light-headedness, and fainting.