Bleeding gums can be caused by infection with body fluids from an AIDS patient, but this needs to be determined on a case-by-case basis. AIDS is a sexually transmitted disease caused by infection with the Human Immunodeficiency Virus (HIV), which is transmitted through sexual contact, blood contact, and mother-to-child transmission.HIV is found in large quantities in body fluids such as blood, semen, and vaginal secretions, and in small amounts in fluids such as saliva, tears, and breast milk. A person with bleeding gums may become infected with HIV if he or she comes into contact with the blood, semen and other body fluids of an AIDS patient (usually through oral sex, etc.). However, kissing or using an AIDS patient’s toothbrush, etc., usually does not lead to AIDS infection, due to the low level of HIV in saliva. It is recommended that you protect yourself when you have fresh bleeding gums, such as bringing your own utensils when you go out to eat, as well as avoiding risky sexual behaviors.