• You may have shivering or chills.
• You may have a fever.
• Your skin may become cool, damp, and pale.
• Your heart may beat faster than normal.
• You may have trouble breathing.
• Your chest may feel tight.
• Your stomach may become upset, and you may even vomit.
• You may get low back pain.
• You may notice a red rash or spots on your skin.
• Your urine may turn red or dark brown.
• Your skin and/or eyes may turn slightly yellow.

While problems other than a blood transfusion may cause you to experience the above symptoms, it is important to let your doctor or the laboratory know about them.