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Yeast infections

Another fungal infection that's common in later stages is thrush, a mouth infection caused by Candida, a type of yeast.

"It's a very common fungus and the one that causes yeast infections in women," Dr. Malvestutto says. "They tend to appear in the mouth or esophagus, making it difficult to swallow."

Ron woke up one day to find white patches on his tongue. He had thrush. For him, "It was not bothersome other than I didn't like having it." The infection was hard to get rid of, but finally cleared up after Ron started taking drugs to combat HIV.

Next: Confusion or difficulty concentrating