When red blood cells are low, the person may be tired, pale, or cranky. White blood cells fight infection. When they are low, the person is more likely to get sick and may need to stay out of crowded places or away from people who have something they could catch-like a cold, the flu, or chicken pox. Because of this, you may need to stay away from them if you get sick. Tell your parents when you have been around anyone who is sick, including anyone who has a cold, so they can watch for signs that you might be getting sick.
Platelets help stop bleeding.
People who don't have enough platelets may bruise or bleed easily. They may have to stay away from rough play. If they get a nosebleed while their platelets are low, don't panic. They may bleed a little more than someone else would, but it will stop. You may notice changes in how the person who is getting chemotherapy acts sometimes.