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HIV infection is a disease caused by the human immunodeficiency virus (HIV). The condition gradually destroys the immune system, which makes it harder for the body to fight off infections.

Causes
The human immunodeficiency virus (HIV) can be spread by the following:

• Contaminated blood transfusions and blood product
• Intimate sexual contact
• The use of contaminated needles and syringes

Symptoms
HIV can cause any symptoms of illness, since infections can occur throughout the body. Some symptoms related to HIV infection include:

• Diarrhea
• Fatigue
• Fever
• Frequent vaginal yeast infections
• Headache
• Mouth sores, including candidal infection
• Muscular stiffness or aching
• Rash of various types, including seborrheic dermatitis
• Sore throat
• Swollen lymph glands